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TransCanada Reports Solid Third Quarter 2017 Financial Results; Diversified, Low-Risk Business Strategy Continues to Drive Performance

November 9, 2017 7:32 AM

CALGARY, ALBERTA -- (Marketwired) -- 11/09/17 -- TransCanada Corporation (TSX: TRP) (NYSE: TRP) (TransCanada or the Company) today announced net income attributable to common shares for third quarter 2017 of $612 million or $0.70 per share compared to a net loss of $135 million or $0.17 per share for the same period in 2016. Comparable earnings for third quarter 2017 were $614 million or $0.70 per share compared to $622 million or $0.78 per share for the same period in 2016. TransCanada's Board of Directors also declared a quarterly dividend of $0.625 per common share for the quarter ending December 31, 2017, equivalent to $2.50 per common share on an annualized basis.

"During the third quarter of 2017, our diversified portfolio of high-quality, long-life energy infrastructure assets continued to perform very well," said Russ Girling, TransCanada's president and chief executive officer. "While comparable earnings are lower compared to the same quarter in 2016, the reduction is largely attributable to completing the sale of our U.S. Northeast Power generation portfolio in second quarter 2017. Over the first nine months of this year, financial performance has been very strong with comparable earnings per share increasing 12 per cent compared to the same period in 2016. Looking forward, we anticipate continued solid financial performance as over 95 per cent of our earnings before interest, taxes, depreciation and amortization (EBITDA) is expected to come from regulated or long-term contracted assets."

"In the third quarter, we continued to advance our near-term capital program by placing the Grand Rapids pipeline into service. In addition, we continue to progress $24 billion of other near-term capital projects that are expected to generate significant growth in earnings and cash flow and support an expected annual dividend growth rate at the upper end of an eight to 10 per cent range through 2020," added Girling. "We have invested approximately $10 billion into these projects to date and are well positioned to fund the remainder of this capital program over the next few years through our strong internally generated cash flow and access to capital markets on compelling terms. To date in the fourth quarter we have recovered approximately $0.6 billion of development costs associated with the Prince Rupert Gas Transmission project and agreed to sell our Ontario solar portfolio for approximately $540 million. The proceeds will be used to fund a portion of our capital program and for general corporate purposes."

"Despite the disappointing termination of the Energy East, Eastern Mainline and Upland projects, we continue to progress a number of additional medium to longer-term organic growth opportunities in our three core businesses of natural gas pipelines, liquids pipelines and energy in Canada, the United States and Mexico. Success in advancing Keystone XL or other growth initiatives, including the Bruce Power life extension, could further augment or extend the Company's dividend growth outlook," concluded Girling.

Highlights

(All financial figures are unaudited and in Canadian dollars unless noted otherwise)


--  Third quarter 2017 financial results
    --  Net income attributable to common shares of $612 million or $0.70
        per share
    --  Comparable earnings of $614 million or $0.70 per share
    --  Comparable earnings before interest, taxes, depreciation and
        amortization of $1.7 billion
    --  Net cash provided by operations of $1.2 billion
    --  Comparable funds generated from operations of $1.3 billion
    --  Comparable distributable cash flow of $769 million or $0.88 per
        common share
--  Declared a quarterly dividend of $0.625 per common share for the quarter
    ending December 31, 2017
--  Placed the $0.9 billion Grand Rapids pipeline in service
--  Received approval from Canada's National Energy Board (NEB) to commence
    service on the Canadian Mainline long-term fixed price service effective
    November 1, 2017
--  After careful review of changed circumstances, announced the termination
    of Energy East and related projects and expect an estimated $1 billion
    after-tax non-cash charge will be recorded in fourth quarter 2017
--  In October, received $0.6 billion related to development costs and
    carrying charges on the Prince Rupert Gas Transmission (PRGT) project
    following Progress Energy's decision to terminate their agreement with
    us
--  Raised $1 billion in proceeds through a Canadian offering of Medium Term
    Notes maturing in 2028 and 2047
--  On October 25, announced an agreement to sell our Ontario solar
    portfolio for approximately $540 million with proceeds to be used to
    partially fund our near-term capital program. The transaction is
    expected to result in an estimated $100 million after-tax gain to be
    recognized upon closing
--  In November, the $1 billion Northern Courier pipeline achieved
    commercial in-service, and we placed the US$0.4 billion Rayne XPress
    pipeline and the US$0.3 billion Gibraltar project in service. We expect
    to bring the US$1.6 billion Leach XPress project in service in early
    January 2018
--  Advanced the Portland XPress and Buckeye XPress projects to move
    additional gas across our pipeline network

Net income attributable to common shares increased by $747 million to $612 million or $0.70 per share for the three months ended September 30, 2017 compared to the same period last year. Net income per common share in third quarter 2017 includes the dilutive effect of issuing 60 million common shares in fourth quarter 2016. Third quarter 2017 results included an additional $12 million after-tax net loss on sales of U.S. Northeast Power assets, an after-tax charge of $30 million for integration-related costs associated with the acquisition of Columbia and an $8 million after-tax charge related to the maintenance of Keystone XL assets. Third quarter 2016 included a $656 million after-tax goodwill impairment charge, an after-tax charge of $67 million related to costs associated with the acquisition of Columbia, recognition of $28 million of income tax recoveries resulting from a third party sale of Keystone XL project assets, a $9 million after-tax charge related to Keystone XL maintenance and liquidation costs and $3 million of after-tax costs related to the sale of our U.S. Northeast Power business. All of these specific items as well as unrealized gains and losses from changes in risk management activities, are excluded from comparable earnings.

Comparable earnings for third quarter 2017 were $614 million or $0.70 per share compared to $622 million or $0.78 per share for the same period in 2016, a decrease of $8 million or $0.08 per share. Comparable earnings per share for the three months ended September 30, 2017 include the dilutive effect of issuing 60 million common shares in fourth quarter 2016. The decrease in third quarter comparable earnings was primarily due to the net effect of the monetization of our U.S. Northeast Power generation assets in second quarter 2017 and a lower contribution from U.S. Natural Gas Pipelines primarily due to the timing of funding contributions to the Columbia Gas defined benefit pension plan, partially offset by higher ANR transportation revenues resulting from a Federal Energy Regulatory Commission (FERC)-approved rate settlement, effective August 1, 2016, higher AFUDC on our rate-regulated U.S. Natural Gas Pipelines, lower interest expense mainly due to the repayment of the remaining bridge facilities that partially funded the acquisition of Columbia, higher interest income and other primarily due to realized gains in 2017 compared to realized losses in 2016 on derivatives used to manage our net exposure to foreign exchange rate fluctuations on U.S. dollar-denominated income and income recognized on the termination of the PRGT project, higher contribution from Liquids Pipelines primarily due to higher Keystone volumes and the commencement of operations on Grand Rapids, higher earnings from Bruce Power mainly due to improved results from contracting activities, and a higher contribution from Mexico Natural Gas Pipelines primarily due to earnings from Mazatlan beginning in December 2016, partially offset by the impairment of our equity investment in TransGas.

Notable recent developments include:

Canadian Natural Gas Pipelines:


--  Canadian Mainline: On September 21, 2017, the NEB approved the long-term
    fixed price (LTFP) service, as filed, with an effective date of November
    1, 2017. This new service allows us to transport 1.5 PJ/d (1.4 Bcf/d) of
    natural gas at a simplified toll of $0.77/GJ for a ten year term from
    the Alberta / Saskatchewan border to the Dawn Hub in southern Ontario
    and provides shippers with toll certainty and improved market access.

--  NGTL System: In March 2017, we filed an application with the NEB for a
    variance to the existing approvals for the North Montney project on the
    NGTL System to remove the condition that the project could only proceed
    once a positive final investment decision is made for the Pacific
    Northwest LNG project (PNW LNG). North Montney is now under-pinned by
    restructured, 20-year commercial contracts with shippers and is not
    dependent on the LNG project proceeding. On September 7, 2017, the NEB
    provided notice that a public hearing process would be used to consider
    our variance application. The NEB also stated it would consider the
    continued appropriateness and applicability of the tolling decisions and
    associated conditions of the original approval. On October 26, 2017, the
    NEB issued the Hearing Order indicating the oral portion of the hearing
    will begin the week of January 22, 2018 with a decision to follow within
    12 weeks after the hearing conclusion.

--  Prince Rupert Gas Transmission: In July 2017, we were notified that PNW
    LNG would not be proceeding with their proposed LNG project and that
    Progress Energy (Progress) would be terminating their agreement with us
    for development of the PRGT project, effective August 10, 2017. In
    accordance with the terms of the agreement, all project costs incurred
    to advance the project, including carrying charges, are fully
    recoverable upon termination. As a result, we received a payment of $0.6
    billion from Progress in October 2017.

U.S. Natural Gas Pipelines:


--  Rayne XPress: Rayne Xpress was placed in service November 2, 2017. This
    Columbia Gulf project will transport approximately 1.1 PJ/d (1.0 Bcf/d)
    of supply from an interconnect with the Leach XPress pipeline project,
    and another interconnect, to markets along the system and to the Gulf
    Coast.

--  Midstream: The Gibraltar Midstream project, a 1,000 TJ/d (934 MMcf/d)
    dry gas header pipeline in southwest Pennsylvania, was placed in service
    November 1, 2017.

--  Leach XPress: The Leach XPress project is expected to have a US$100
    million increase in its capital project cost due to delays caused by
    weather on the project's construction schedule and the resulting
    increase in contractor costs. Leach XPress is expected to be placed in
    service in early January 2018.

--  FERC Update: The FERC regained a quorum of three commissioners in August
    2017 and two additional commissioners were approved by the U.S. Senate
    on November 2, 2017. The FERC has stated that it intends to
    expeditiously address the resulting backlog of pending applications. We
    expect the FERC certificates for the WB XPress, Mountaineer XPress and
    Gulf XPress projects to be received in fourth quarter 2017.

--  Mountaineer XPress: The Mountaineer XPress project is expected to have a
    US$600 million increase in its capital project cost due to increased
    construction cost estimates. As a result of a cost sharing mechanism,
    overall project returns are not anticipated to be materially affected.
    Mountaineer XPress is expected to be placed in service in fourth quarter
    2018.

--  Buckeye Xpress: The Buckeye XPress project (BXP) represents an up-sizing
    of an existing pipeline replacement project under our Columbia Gas
    modernization program. The US$0.2 billion cost to up-size the
    replacement pipe and install compressor upgrades will enable us to offer
    290 TJ/d (275 MMcf/d) of incremental pipeline capacity to accommodate
    growing Appalachian production. We expect BXP to be placed in service in
    late 2020.

--  Portland XPress Project: PNGTS has executed Precedent Agreements with
    several local distribution companies (LDCs) in New England and Atlantic
    Canada to re-contract certain system capacity set to expire in 2019, as
    well as expand the PNGTS system to bring its certificated capacity up to
    280 TJ/d (265 MMcf/d). The approximately US$80 million Portland XPress
    Project (PXP) will proceed concurrently with upstream capacity
    expansions. The in-service dates of PXP are being phased-in over a three
    year period beginning November 1, 2018.

--  Great Lakes impact from Canadian Mainline's LTFP: In conjunction with
    the Canadian Mainline's LTFP service, Great Lakes entered into a new 10-
    year gas transportation contract with the Canadian Mainline. This
    contract received NEB approval in September 2017 and became effective on
    November 1, 2017. This contract contains volume reduction options up to
    full contract quantity beginning in year three.

--  Great Lakes Rate Case: On October 30, 2017, Great Lakes filed a rate
    settlement with the FERC to satisfy its obligations from its 2013 rate
    settlement for new rates to be in effect by January 1, 2018. The 2017
    Great Lakes Settlement, if approved by the FERC, will decrease Great
    Lakes' maximum transportation rates by 27 per cent beginning October 1,
    2017. Great Lakes expects that the impact from other changes, including
    the recent long-term transportation contract with the Canadian Mainline
    as described above, other revenue opportunities on the system and the
    elimination of the revenue sharing mechanism with its customers, will
    more than offset the full year impact of the reduction in Great Lakes'
    rates beginning in 2018. The 2017 Great Lakes Settlement does not
    contain any moratorium and Great Lakes will be required to file for new
    rates no later than March 31, 2022, with new rates to be effective
    October 1, 2022.

--  Northern Border: Northern Border and its shippers have been engaged in
    settlement discussions, and have recently agreed to a settlement-in-
    principle addressing all rate and service related issues raised during
    the settlement discussions. Northern Border plans to file a settlement
    agreement with the FERC before the end of the year, reflecting the
    settlement-in-principle, precluding the need to file a general rate case
    as contemplated by its 2012 Settlement. Northern Border anticipates that
    the FERC will accept the settlement agreement and that it will be
    unopposed. This will provide Northern Border with rate stability over
    the longer term. At this time, we do not believe that the final outcome
    of the settlement will have a material impact on our consolidated
    results. We have a 13 per cent indirect ownership interest in Northern
    Border through TC PipeLines, LP.

Liquids Pipelines:


--  Energy East and Related Projects: On September 7, 2017, we requested the
    NEB suspend the review of the Energy East and Eastern Mainline project
    applications for 30 days to provide time for us to conduct a careful
    review of the NEB's changes, announced on August 23, 2017, regarding the
    list of issues and environmental assessment factors related to the
    projects and how these changes impact the projects' costs, schedules and
    viability.

    On October 5, 2017, after careful review of the changed circumstances,
    we informed the NEB that we will not be proceeding with the Energy East
    and Eastern Mainline project applications. We have also notified
    Quebec's Ministere du Developpement durable, de l'Environnement, et de
    la Lutte contre les changements climatiques that we are withdrawing the
    Energy East project from the environmental review process. As the Energy
    East pipeline was also to provide transportation services for the Upland
    pipeline, the U.S. Department of State was notified on October 5, 2017,
    that we will no longer be pursuing the U.S. Presidential Permit
    application for that project.

    We are reviewing the approximate $1.3 billion carrying value of the
    projects, including AFUDC capitalized since inception, and expect an
    estimated $1 billion after-tax non-cash charge will be recorded in our
    fourth quarter 2017 results. We ceased capitalizing AFUDC on the
    projects effective August 23, 2017, the date of the NEB's announced
    scope changes. With Energy East's inability to reach a regulatory
    decision, no recoveries of costs from third parties are expected.


--  Keystone XL: Given the passage of time since the Keystone XL
    Presidential Permit application was previously denied in November 2015,
    we are updating the shipping contracts and anticipate the core contract
    shipper group will be modified with the introduction of new shippers and
    reductions in volume commitments by other shippers. We anticipate
    commercial support for the project to be substantially similar to that
    which existed when we first applied for a Keystone XL pipeline permit.

    In July 2017, we launched an open season to solicit additional binding
    commitments from interested parties for transportation of crude oil on
    the Keystone Pipeline and for the Keystone XL pipeline project from
    Hardisty, Alberta to markets in Cushing, Oklahoma and the U.S. Gulf
    Coast. On September 6, 2017, we extended this open season to October 26,
    2017 due to the impact caused by Hurricane Harvey to Houston, Texas and
    parts of the U.S. Gulf Coast. We are currently analyzing the results of
    the open season.

    In February 2017, we filed an application with the Nebraska Public
    Service Commission (PSC) seeking approval for the Keystone XL pipeline
    route through that state. In August 2017, the Nebraska PSC concluded the
    public hearing for the Keystone XL pipeline and final written
    submissions were submitted in September 2017. The Nebraska PSC will
    review all comments gathered from the public meetings, the written
    submissions and the hearing before making a final decision on the route
    permit which is expected by the end of November 2017.


--  Grand Rapids: In late August 2017, the Grand Rapids pipeline, jointly
    owned by TransCanada and PetroChina Canada Ltd., was placed in service.
    The 460 km (287 mile) pipeline plays a key role in connecting producing
    areas northwest of Fort McMurray, Alberta, to terminals in the Edmonton
    / Heartland region.

--  Northern Courier: Northern Courier, a 90 km (56 mile) pipeline which
    transports bitumen and diluent between the Fort Hills mine site and
    Suncor Energy's terminal located north of Fort McMurray, Alberta,
    achieved commercial in-service on November 1, 2017.

Energy:


--  Sale of Ontario Solar Assets: On October 24, 2017, we entered into an
    agreement to sell our Ontario Solar portfolio, comprised of eight
    facilities with a total generating capacity of 76 MWs, to Axium Infinity
    Solar LP for approximately $540 million. The sale is expected to close
    by the end of 2017, subject to certain regulatory and other approvals,
    and will include customary closing adjustments. The transaction is
    expected to result in an estimated gain of $130 million before tax ($100
    million after tax) to be recognized upon closing.

Corporate:


--  Common Share Dividend: Our Board of Directors declared a quarterly
    dividend of $0.625 per share for the quarter ending December 31, 2017 on
    TransCanada's outstanding common shares. The quarterly amount is
    equivalent to $2.50 per common share on an annualized basis.

--  Medium Term Note Issuance: In September 2017, TransCanada issued $1
    billion of Medium Term Notes comprised of $300 million of 10.5-year
    notes at an interest rate of 3.39 per cent and $700 million of 30-year
    notes at an interest rate of 4.33 per cent.

--  Dividend Reinvestment Plan (DRP): To date in 2017, the participation
    rate in our DRP has been approximately 36 per cent of common share
    dividends, resulting in $594 million of common equity issued under the
    program year-to-date.

--  ATM Equity Issuance Program: In June 2017, we established an At-The-
    Market (ATM) equity issuance program that allows us to issue common
    shares from treasury having an aggregate gross sales price of up to $1.0
    billion or their U.S. dollar equivalent, from time to time, at our
    discretion, at the prevailing market price when sold through the Toronto
    Stock Exchange or the New York Stock Exchange. The ATM program, which is
    effective for a 25-month period, will be activated at our discretion, if
    and as required, based on the spend profile of TransCanada's capital
    program and relative cost of other funding options. At September 30,
    2017, no common shares had been issued under the program.

Teleconference and Webcast:

We will hold a teleconference and webcast on Thursday, November 9, 2017 to discuss our third quarter 2017 financial results. Russ Girling, TransCanada President and Chief Executive Officer, and Don Marchand, Executive Vice-President and Chief Financial Officer, along with other members of the TransCanada executive leadership team, will discuss the financial results and Company developments at 9 a.m. (MT) / 11 a.m. (ET).

Members of the investment community and other interested parties are invited to participate by calling 800.898.3989 or 416.406.0743 (Toronto area) and enter passcode 5745518#. Please dial in 10 minutes prior to the start of the call. A live webcast of the teleconference will be available at www.transcanada.com.

A replay of the teleconference will be available two hours after the conclusion of the call until midnight (ET) on November 16, 2017. Please call 800.408.3053 or 905.694.9451 (Toronto area) and enter pass code 7183649#.

The unaudited interim condensed Consolidated Financial Statements and Management's Discussion and Analysis (MD&A) are available under TransCanada's profile on SEDAR at www.sedar.com, with the U.S. Securities and Exchange Commission on EDGAR at www.sec.gov/info/edgar.shtml and on the TransCanada website at www.transcanada.com.

With more than 65 years' experience, TransCanada is a leader in the responsible development and reliable operation of North American energy infrastructure including natural gas and liquids pipelines, power generation and gas storage facilities. TransCanada operates a network of natural gas pipelines that extends more than 91,500 kilometres (56,900 miles), tapping into virtually all major gas supply basins in North America. TransCanada is the continent's largest provider of gas storage and related services with 653 billion cubic feet of storage capacity. A large independent power producer, TransCanada owns or has interests in approximately 6,200 megawatts of power generation in Canada and the United States. TransCanada is also the developer and operator of one of North America's leading liquids pipeline systems that extends approximately 4,800 kilometres (3,000 miles) connecting growing continental oil supplies to key markets and refineries. TransCanada's common shares trade on the Toronto and New York stock exchanges under the symbol TRP. Visit TransCanada.com and our blog to learn more, or connect with us on social media and 3BL Media.

Forward Looking Information

This release contains certain information that is forward-looking and is subject to important risks and uncertainties (such statements are usually accompanied by words such as "anticipate", "expect", "believe", "may", "will", "should", "estimate", "intend" or other similar words). Forward-looking statements in this document are intended to provide TransCanada security holders and potential investors with information regarding TransCanada and its subsidiaries, including management's assessment of TransCanada's and its subsidiaries' future plans and financial outlook. All forward-looking statements reflect TransCanada's beliefs and assumptions based on information available at the time the statements were made and as such are not guarantees of future performance. Readers are cautioned not to place undue reliance on this forward-looking information, which is given as of the date it is expressed in this news release, and not to use future-oriented information or financial outlooks for anything other than their intended purpose. TransCanada undertakes no obligation to update or revise any forward-looking information except as required by law. For additional information on the assumptions made, and the risks and uncertainties which could cause actual results to differ from the anticipated results, refer to the Quarterly Report to Shareholders dated November 8, 2017 and the 2016 Annual Report to shareholders filed under TransCanada's profile on SEDAR at www.sedar.com and with the U.S. Securities and Exchange Commission at www.sec.gov.

Non-GAAP Measures

This news release contains references to non-GAAP measures, including comparable earnings, comparable EBITDA, comparable distributable cash flow, comparable funds generated from operations, comparable earnings per share and comparable distributable cash flow per share, that do not have any standardized meaning as prescribed by U.S. GAAP and therefore are unlikely to be comparable to similar measures presented by other companies. These non-GAAP measures are calculated on a consistent basis from period to period and are adjusted for specific items in each period, as applicable. For more information on non-GAAP measures, refer to TransCanada's Quarterly Report to Shareholders dated November 8, 2017.

Quarterly report to shareholders

Third quarter 2017

Financial highlights


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                                      three months ended  nine months ended
                                         September 30        September 30
                                     ------------------- -------------------
(unaudited - millions of $, except
 per share amounts)                       2017      2016      2017      2016
----------------------------------------------------------------------------
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Income
Revenues                                 3,242     3,632     9,850     8,886
Net income/(loss) attributable to
 common shares                             612      (135)    2,136       482
  per common share - basic               $0.70    ($0.17)    $2.46     $0.66
    - diluted                            $0.70    ($0.17)    $2.45     $0.66
Comparable EBITDA(1)                     1,667     1,886     5,474     4,757
Comparable earnings(1)                     614       622     1,971     1,482
  per common share(1)                    $0.70     $0.78     $2.27     $2.02

Cash flows
Net cash provided by operations          1,185     1,265     3,840     3,494
Comparable funds generated from
 operations(1)                           1,316     1,441     4,191     3,746
Comparable distributable cash flow(1)      769       994     2,872     2,613
  per common share(1)                    $0.88     $1.25     $3.30     $3.56
Capital spending - capital
 expenditures                            2,031     1,444     5,383     3,262
  - projects in development                 37        62       135       219
  - contributions to equity
   investments                             475       286     1,140       570
Acquisitions, net of cash acquired           -    12,609         -    13,608
Proceeds from sales of assets, net of
 transaction costs                           -         -     4,147         6

Dividends declared
Per common share                        $0.625    $0.565    $1.875    $1.695
Basic common shares outstanding
 (millions)
Average for the period                     873       797       870       734
End of period                              874       800       874       800
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(1) Comparable EBITDA, comparable earnings, comparable earnings per common
    share, comparable funds generated from operations, comparable
    distributable cash flow and comparable distributable cash flow per
    common share are all non-GAAP measures. See the non-GAAP measures
    section for more information.

Management's discussion and analysis

November 8, 2017

This management's discussion and analysis (MD&A) contains information to help the reader make investment decisions about TransCanada Corporation. It discusses our business, operations, financial position, risks and other factors for the three and nine months ended September 30, 2017, and should be read with the accompanying unaudited condensed consolidated financial statements for the three and nine months ended September 30, 2017 which have been prepared in accordance with U.S. GAAP.

This MD&A should also be read in conjunction with our December 31, 2016 audited consolidated financial statements and notes and the MD&A in our 2016 Annual Report.

FORWARD-LOOKING INFORMATION

We disclose forward-looking information to help current and potential investors understand management's assessment of our future plans and financial outlook, and our future prospects overall.

Statements that are forward-looking are based on certain assumptions and on what we know and expect today. These statements generally include words like anticipate, expect, believe, may, will, should, estimate or other similar words.

Forward-looking statements in this MD&A include information about the following, among other things:


--  planned changes in our business including the divestiture of assets
--  our financial and operational performance, including the performance of
    our subsidiaries
--  expectations or projections about strategies and goals for growth and
    expansion
--  expected cash flows and future financing options available to us
--  expected dividend growth
--  expected costs for planned projects, including projects under
    construction, permitting and in development
--  expected schedules for planned projects (including anticipated
    construction and completion dates)
--  expected regulatory processes and outcomes
--  expected impact of regulatory outcomes
--  expected outcomes with respect to legal proceedings, including
    arbitration and insurance claims
--  expected capital expenditures and contractual obligations
--  expected operating and financial results
--  expected impact of future accounting changes, commitments and contingent
    liabilities
--  expected industry, market and economic conditions.

Forward-looking statements do not guarantee future performance. Actual events and results could be significantly different because of assumptions, risks or uncertainties related to our business or events that happen after the date of this MD&A.

Our forward-looking information is based on the following key assumptions, and is subject to the following risks and uncertainties:

Assumptions


--  inflation rates, commodity prices and capacity prices
--  nature and scope of hedging
--  regulatory decisions and outcomes
--  foreign exchange rates
--  interest rates
--  tax rates
--  planned and unplanned outages and the use of our pipeline and energy
    assets
--  integrity and reliability of our assets
--  access to capital markets
--  anticipated construction costs, schedules and completion dates.

Risks and uncertainties


--  our ability to successfully implement our strategic priorities and
    whether they will yield the expected benefits
--  the operating performance of our pipeline and energy assets
--  amount of capacity sold and rates achieved in our pipeline businesses
--  the availability and price of energy commodities
--  the amount of capacity payments and revenues we receive from our energy
    business
--  regulatory decisions and outcomes
--  outcomes of legal proceedings, including arbitration and insurance
    claims
--  performance and credit risk of our counterparties
--  changes in market commodity prices
--  changes in the regulatory environment
--  changes in the political environment
--  changes in environmental and other laws and regulations
--  competitive factors in the pipeline and energy sectors
--  construction and completion of capital projects
--  costs for labour, equipment and materials
--  access to capital markets
--  interest, tax and foreign exchange rates
--  weather
--  cyber security
--  technological developments
--  economic conditions in North America as well as globally.

You can read more about these factors and others in reports we have filed with Canadian securities regulators and the SEC, including the MD&A in our 2016 Annual Report.

As actual results could vary significantly from the forward-looking information, you should not put undue reliance on forward-looking information and should not use future-oriented information or financial outlooks for anything other than their intended purpose. We do not update our forward-looking statements due to new information or future events, unless we are required to by law.

FOR MORE INFORMATION

You can find more information about TransCanada in our Annual Information Form and other disclosure documents, which are available on SEDAR (www.sedar.com).

NON-GAAP MEASURES

This MD&A references the following non-GAAP measures:


--  comparable earnings
--  comparable earnings per common share
--  comparable EBITDA
--  comparable EBIT
--  funds generated from operations
--  comparable funds generated from operations
--  comparable distributable cash flow
--  comparable distributable cash flow per common share.

These measures do not have any standardized meaning as prescribed by GAAP and therefore may not be similar to measures presented by other entities.

Comparable measures

We calculate comparable measures by adjusting certain GAAP and non-GAAP measures for specific items we believe are significant but not reflective of our underlying operations in the period. These comparable measures are calculated on a consistent basis from period to period and are adjusted for specific items in each period, as applicable.

Our decision to adjust for a specific item is subjective and made after careful consideration. Specific items may include:


--  certain fair value adjustments relating to risk management activities
--  income tax refunds and adjustments and changes to enacted tax rates
--  gains or losses on sales of assets
--  legal, contractual and bankruptcy settlements
--  impact of regulatory or arbitration decisions relating to prior year
    earnings
--  restructuring costs
--  impairment of goodwill, investments and other assets including certain
    ongoing maintenance and liquidation costs
--  acquisition and integration costs.

We exclude the unrealized gains and losses from changes in the fair value of derivatives used to reduce our exposure to certain financial and commodity price risks. These derivatives generally provide effective economic hedges, but do not meet the criteria for hedge accounting. As a result, the changes in fair value are recorded in net income. As these amounts do not accurately reflect the gains and losses that will be realized at settlement, we do not consider them reflective of our underlying operations.

The following table identifies our non-GAAP measures against their equivalent GAAP measures.


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Comparable measure                    Original measure
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----------------------------------------------------------------------------
comparable earnings                   net income attributable to common
                                      shares
comparable earnings per common share  net income per common share
comparable EBITDA                     segmented earnings
comparable EBIT                       segmented earnings
comparable funds generated from       net cash provided by operations
 operations
comparable distributable cash flow    net cash provided by operations
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Comparable earnings and comparable earnings per common share

Comparable earnings represent earnings or loss attributable to common shareholders on a consolidated basis, adjusted for specific items. Comparable earnings is comprised of segmented earnings, interest expense, AFUDC, interest income and other, income taxes and non-controlling interests, adjusted for the specific items. See the Consolidated results section for a reconciliation to net income attributable to common shares.

Comparable EBIT and comparable EBITDA

Comparable EBIT represents segmented earnings adjusted for the specific items described above. We use comparable EBIT as a measure of our earnings from ongoing operations as it is a useful measure of our performance and an effective tool for evaluating trends in each segment. Comparable EBITDA is calculated the same way as comparable EBIT but excludes the non-cash charges for depreciation and amortization. See the Reconciliation of non-GAAP measures section for a reconciliation to segmented earnings.

Funds generated from operations and comparable funds generated from operations

Funds generated from operations reflects net cash provided by operations before changes in operating working capital. We believe it is a useful measure of our consolidated operating cash flow because it does not include fluctuations from working capital balances, which do not necessarily reflect underlying operations in the same period, and is used to provide a consistent measure of the cash generating performance of our assets. Comparable funds generated from operations is adjusted for the cash impact of specific items noted above. See the Financial condition section for a reconciliation to net cash provided by operations.

Comparable distributable cash flow and comparable distributable cash flow per common share

We believe comparable distributable cash flow is a useful supplemental measure of performance that defines cash available to common shareholders before capital allocation. Comparable distributable cash flow is defined as comparable funds generated from operations less preferred share dividends, distributions to non-controlling interests and maintenance capital expenditures. Maintenance capital expenditures are expenditures incurred to maintain our operating capacity, asset integrity and reliability, and include amounts attributable to our proportionate share of maintenance capital expenditures on our equity investments. Although we deduct maintenance capital expenditures in determining comparable distributable cash flow, in certain of our rate-regulated businesses, maintenance capital expenditures are included in their respective rate bases, on which we earn a regulated return and recover depreciation through future tolls. See the Financial condition section for a reconciliation to net cash provided by operations.

Consolidated results - third quarter 2017

Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, except
 per share amounts)                     2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian Natural Gas Pipelines           316       329        903       943
U.S. Natural Gas Pipelines               337       332      1,299       787
Mexico Natural Gas Pipelines              95        98        333       184
Liquids Pipelines                        203       183        681       593
Energy                                   237      (828)     1,080      (583)
Corporate                                (29)      (36)      (102)      (87)
----------------------------------------------------------------------------
Total segmented earnings               1,159        78      4,194     1,837
Interest expense                        (504)     (522)    (1,528)   (1,456)
Allowance for funds used during
 construction                            145       110        367       322
Interest income and other                 84        12        193       118
----------------------------------------------------------------------------
Income/(loss) before income taxes        884      (322)     3,226       821
Income tax (expense)/recovery           (188)      266       (781)      (78)
----------------------------------------------------------------------------
Net income/(loss)                        696       (56)     2,445       743
Net income attributable to non-
 controlling interests                   (44)      (52)      (189)     (184)
----------------------------------------------------------------------------
Net income/(loss) attributable to
 controlling interests                   652      (108)     2,256       559
Preferred share dividends                (40)      (27)      (120)      (77)
----------------------------------------------------------------------------
Net income/(loss) attributable to
 common shares                           612      (135)     2,136       482
----------------------------------------------------------------------------
 Net income/(loss) per common share
 - basic                               $0.70    ($0.17)     $2.46     $0.66
----------------------------------------------------------------------------
   - diluted                           $0.70    ($0.17)     $2.45     $0.66
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Net income attributable to common shares increased by $747 million and $1,654 million or $0.87 and $1.80 per share for the three and nine months ended September 30, 2017 compared to the same periods in 2016. Net income per common share in 2017 included the dilutive effect of issuing 161 million common shares in 2016, of which 60 million were issued in fourth quarter 2016.

The 2017 results included:


--  a $243 million after-tax net gain related to the monetization of our
    U.S. Northeast power business, which included a $440 million after-tax
    gain on the sale of TC Hydro, an incremental loss of $183 million after
    tax recorded on the sale of the thermal and wind package and $14 million
    year-to-date of after-tax disposition costs and income tax adjustments
--  an after-tax charge of $30 million in third quarter and $69 million
    year-to-date for integration-related costs associated with the
    acquisition of Columbia
--  an after-tax charge of $8 million in third quarter and $19 million year-
    to-date related to the maintenance of Keystone XL assets which is being
    expensed pending further advancement of the project
--  a $7 million income tax recovery in first quarter related to the
    realized loss on a third party sale of Keystone XL project assets. A
    provision for the expected pre-tax loss on these assets was included in
    our 2015 impairment charge, but the related income tax recoveries could
    not be recorded until realized.

The 2016 results included:


--  a $656 million after-tax impairment on Ravenswood goodwill. As a result
    of information received during the process to monetize our U.S.
    Northeast Power business in third quarter 2016, it was determined that
    the fair value of Ravenswood no longer exceeded its carrying value
--  a $176 million after-tax impairment charge in first quarter on the
    carrying value of our Alberta PPAs as a result of our decision to
    terminate the PPAs
--  costs associated with the acquisition of Columbia including an after-tax
    charge of $67 million in third quarter, primarily relating to retention,
    severance and integration expenses, and $206 million year-to-date which
    also included $109 million related to the dividend equivalent payments
    on the subscription receipts issued as part of the permanent financing
    of the transaction, $36 million related to acquisition costs and $6
    million related to interest earned on the subscription receipt funds
    held in escrow
--  $28 million of income tax recoveries in third quarter related to the
    realized loss on a third party sale of Keystone XL project assets. A
    provision for the expected loss on these assets was included in our
    fourth quarter 2015 impairment charge, but the related income tax
    recoveries could not be recorded until realized
--  an after-tax charge of $9 million in third quarter and $24 million year-
    to-date related to Keystone XL costs for the maintenance and liquidation
    of project assets which are expensed pending further advancement of the
    project
--  an after-tax charge of $10 million year-to-date for restructuring
    charges mainly related to expected future losses under lease
    commitments. These charges formed part of a restructuring initiative,
    which commenced in 2015, to maximize the effectiveness and efficiency of
    our existing operations and reduce overall costs
--  $3 million of after-tax costs related to the monetization of our U.S.
    Northeast Power business
--  an additional $3 million after-tax loss on the sale of TC Offshore which
    closed on March 31, 2016.

Net income in all periods included unrealized gains and losses from changes in risk management activities which we exclude, along with the above-noted items, to arrive at comparable earnings.

Comparable earnings decreased by $8 million and increased by $489 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 as discussed below in the reconciliation of net income to comparable earnings.



RECONCILIATION OF NET INCOME TO COMPARABLE EARNINGS

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, except
 per share amounts)                      2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Net income/(loss) attributable to
 common shares                           612      (135)     2,136       482
Specific items (net of tax):
  Net loss/(gain) on sales of U.S.
   Northeast power assets                 12         3       (243)        3
  Integration and acquisition
   related costs - Columbia               30        67         69       206
  Keystone XL asset costs                  8         9         19        24
  Keystone XL income tax recoveries        -       (28)        (7)      (28)
  Ravenswood goodwill impairment           -       656          -       656
  Alberta PPA terminations                 -         -          -       176
  Restructuring costs                      -         -          -        10
  TC Offshore loss on sale                 -         -          -         3
  Risk management activities(1)          (48)       50         (3)      (50)
----------------------------------------------------------------------------
Comparable earnings                      614       622      1,971     1,482
----------------------------------------------------------------------------
Net income/(loss) per common share     $0.70   ($0.17)      $2.46     $0.66
Specific items (net of tax):
  Net loss/(gain) on sales of U.S.
   Northeast power assets               0.01         -      (0.28)        -
  Integration and acquisition
   related costs - Columbia             0.03      0.09       0.08      0.29
  Keystone XL asset costs               0.01      0.01       0.02      0.03
  Keystone XL income tax recoveries        -     (0.03)     (0.01)    (0.04)
  Ravenswood goodwill impairment           -      0.82          -      0.89
  Alberta PPA terminations                 -         -          -      0.25
  Restructuring costs                      -         -          -      0.01
  Risk management activities           (0.05)     0.06          -     (0.07)
----------------------------------------------------------------------------
Comparable earnings per common
 share                                 $0.70     $0.78      $2.27     $2.02
----------------------------------------------------------------------------
----------------------------------------------------------------------------

     -----------------------------------------------------------------------
     -----------------------------------------------------------------------
(1)                                 three months ended    nine months ended
     Risk management activities        September 30         September 30
                                   -------------------- --------------------
     (unaudited - millions of $)        2017      2016       2017      2016
     -----------------------------------------------------------------------
     -----------------------------------------------------------------------
     Canadian Power                        1        (4)         5         3
     U.S. Power                           59       (73)       (97)       16
     Liquids marketing                   (19)       (8)       (15)       (6)
     Natural Gas Storage                   4         4          5         9
     Interest rate                        (1)        -         (1)        -
     Foreign exchange                     33         -         89        49
     Income tax attributable to
      risk management activities         (29)       31         17       (21)
     -----------------------------------------------------------------------
     Total unrealized
      gains/(losses) from risk
      management activities               48       (50)         3        50
     -----------------------------------------------------------------------
     -----------------------------------------------------------------------

Comparable earnings decreased by $8 million or $0.08 per share for the three months ended September 30, 2017 compared to the same period in 2016. This decrease was primarily the net effect of:


--  lower contribution from U.S. Power due to the monetization of our U.S.
    Northeast power generation assets in second quarter 2017
--  lower contribution from U.S. Natural Gas Pipelines primarily due to the
    timing of funding contributions to the Columbia Gas defined benefit
    pension plan, partially offset by higher ANR transportation revenues
    resulting from a FERC-approved rate settlement effective August 1, 2016
--  higher AFUDC on our rate-regulated U.S. natural gas pipelines
--  lower interest expense mainly due to the repayment of the remaining
    bridge facilities that partially funded the acquisition of Columbia
--  higher interest income and other primarily due to realized gains in 2017
    compared to realized losses in 2016 on derivatives used to manage our
    net exposure to foreign exchange rate fluctuations on U.S. dollar-
    denominated income and income recognized on the termination of the PRGT
    project
--  higher contribution from Liquids Pipelines primarily due to higher
    volumes on Keystone and the commencement of operations on Grand Rapids
--  higher earnings from Bruce Power mainly due to improved results from
    contracting activities
--  higher contribution from Mexico Natural Gas Pipelines primarily due to
    earnings from Mazatlan beginning in December 2016, partially offset by
    the impairment of our equity investment in TransGas.

Comparable earnings per share for the three months ended September 30, 2017 also included the dilutive effect of issuing 60 million common shares in fourth quarter 2016.

Comparable earnings increased by $489 million or $0.25 per share for the nine months ended September 30, 2017 compared to the same period in 2016. This increase was primarily the net effect of:


--  higher contribution from U.S. Natural Gas Pipelines due to incremental
    earnings resulting from the Columbia acquisition on July 1, 2016, higher
    ANR transportation revenues resulting from a FERC-approved rate
    settlement effective August 1, 2016, partially offset by the timing of
    funding contributions to the Columbia Gas defined benefit pension plan
--  increased earnings from Bruce Power mainly due to higher volumes
    resulting from fewer planned outage days
--  higher contribution from Mexico Natural Gas Pipelines due to earnings
    from Topolobampo beginning in July 2016 and Mazatlan beginning in
    December 2016, partially offset by the impairment of our equity
    investment in TransGas
--  higher earnings from Liquids Pipelines primarily due to higher volumes
    on Keystone and the commencement of operations on Grand Rapids
--  higher AFUDC on our rate-regulated U.S. natural gas pipelines, as well
    as the NGTL System, partially offset by the commercial in-service of
    Topolobampo and completion of Mazatlan construction
--  higher interest income and other due to income related to Coastal
    GasLink project costs and the termination of the PRGT project
--  higher earnings from Western Power following the termination of the
    Alberta PPAs in March 2016
--  lower contribution from U.S. Power due to the monetization of our U.S.
    Northeast power generation assets in second quarter 2017
--  higher interest expense as a result of debt assumed in the acquisition
    of Columbia on July 1, 2016, and long-term debt and junior subordinated
    note issuances.

Comparable earnings per share for the nine months ended September 30, 2017 included the dilutive effect of issuing 161 million common shares in 2016.

Capital Program

We are developing quality projects under our capital program. These long-life infrastructure assets are supported by long-term commercial arrangements with creditworthy counterparties or regulated business models and are expected to generate significant growth in earnings and cash flow.

Our capital program consists of approximately $24 billion of near-term projects and approximately $24 billion of medium to longer-term projects. Amounts presented exclude maintenance capital expenditures, capitalized interest and AFUDC. All projects are subject to cost adjustments due to market conditions, route refinement, permitting conditions, scheduling and timing of regulatory permits.


Near-term projects

----------------------------------------------------------------------------
----------------------------------------------------------------------------
at September 30, 2017                  Expected in-      Estimated  Carrying
(unaudited - billions of $)            service date   project cost     value
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian Natural Gas Pipelines
Canadian Mainline                         2017-2019            0.5       0.2
NGTL System(1)                                 2017            2.3       1.5
                                               2018            0.3       0.1
                                               2019            2.2       0.3
                                               2020            1.9       0.1
                                              2021+            0.4         -
U.S. Natural Gas Pipelines
Columbia Gas
  Leach XPress                                 2018         US 1.6    US 1.3
  Modernization I                              2017         US 0.2    US 0.2
  WB XPress                                    2018         US 0.8    US 0.3
  Mountaineer XPress                           2018         US 2.6    US 0.4
  Modernization II                        2018-2020         US 1.1    US 0.1
Columbia Gulf
  Rayne XPress                                 2017         US 0.4    US 0.4
  Cameron Access                               2018         US 0.3    US 0.2
  Gulf XPress                                  2018         US 0.6    US 0.2
Midstream - Gibraltar                          2017         US 0.3    US 0.2
Mexico Natural Gas Pipelines
Tula                                           2018         US 0.6    US 0.5
Villa de Reyes                                 2018         US 0.6    US 0.4
Sur de Texas(2)                                2018         US 1.3    US 0.7
Liquids Pipelines
Northern Courier                               2017            1.0       1.0
White Spruce                                   2018            0.2         -
Energy
Napanee                                        2018            1.1       0.9
Bruce Power - life extension(3)         up to 2020+            1.0       0.2
----------------------------------------------------------------------------
                                                              21.3       9.2
Foreign exchange impact on near-term
 projects(4)                                                   2.6       1.2
----------------------------------------------------------------------------
Total near-term projects (billions
 of Cdn$)                                                     23.9      10.4
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Beginning in second quarter 2017, near-term NGTL System capital projects
    are being reported by expected in-service dates.
(2) Our proportionate share.
(3) Amounts reflect our proportionate share of the remaining capital costs
    that Bruce Power expects to incur on its life extension investment
    programs in advance of major refurbishment outages which are expected to
    begin in 2020.
(4) Reflects U.S./Canada foreign exchange rate of 1.25 at September 30,
    2017.

Medium to longer-term projects

The medium to longer-term projects have greater uncertainty with respect to timing and estimated project costs. The expected in-service dates of these projects are post-2020, and costs provided in the schedule below reflect the most recent costs for each project as filed with the various regulatory authorities or otherwise determined. These projects have all been commercially secured or, in the case of Keystone XL, commercial support is expected to be achieved. All these projects are subject to approvals that include FID and/or complex regulatory processes.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
at September 30, 2017
                                                         Estimated  Carrying
(unaudited - billions of $)    Segment                project cost     value
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Heartland and TC Terminals     Liquids Pipelines               0.9       0.1
Grand Rapids Phase 2(1)        Liquids Pipelines               0.7         -
Bruce Power - life extension(1)Energy                          5.3         -
Keystone projects
  Keystone XL(2)               Liquids Pipelines            US 8.0    US 0.3
  Keystone Hardisty Terminal(2)Liquids Pipelines               0.3       0.1
BC west coast LNG-related
 projects
  Coastal GasLink              Canadian Natural Gas
                               Pipelines                       4.8       0.4
  NGTL System - Merrick        Canadian Natural Gas
                               Pipelines                       1.9         -
----------------------------------------------------------------------------
                                                              21.9       0.9
Foreign exchange impact on
 medium to longer-term
 projects(3)                                                   2.0       0.1
----------------------------------------------------------------------------
Total medium to longer-term
 projects (billions of Cdn$)                                  23.9       1.0
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Our proportionate share.
(2) Carrying value reflects amount remaining after impairment charge
    recorded in fourth quarter 2015.
(3) Reflects U.S./Canada foreign exchange rate of 1.25 at September 30,
    2017.

Outlook

Our overall comparable earnings outlook for 2017 is expected to be higher than what was previously included in the 2016 Annual Report as a result of stronger performance across our business segments as reported in our 2017 year-to-date results in this MD&A.

Consolidated capital spending

Our expected total capital expenditures, projects in development and contributions to equity investments for 2017 as outlined in the 2016 Annual Report remains unchanged.

Canadian Natural Gas Pipelines

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented earnings (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
NGTL System                              256       246        722       713
Canadian Mainline                        263       278        774       800
Other Canadian pipelines(1)               25        27         81        89
Business development                       -        (2)        (2)       (4)
----------------------------------------------------------------------------
Comparable EBITDA                        544       549      1,575     1,598
Depreciation and amortization           (228)     (220)      (672)     (655)
----------------------------------------------------------------------------
Comparable EBIT and segmented
 earnings                                316       329        903       943
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Includes results from Foothills, Ventures LP and our share of equity
    income from our investment in TQM.

Canadian Natural Gas Pipelines segmented earnings decreased by $13 million and $40 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and are equivalent to comparable EBIT.

Net income and comparable EBITDA for our rate-regulated Canadian Natural Gas Pipelines are generally affected by our approved ROE, our investment base, our level of deemed common equity and incentive earnings or losses. Changes in depreciation, financial charges and income taxes also impact comparable EBITDA but do not have a significant impact on net income as they are almost entirely recovered in revenues on a flow-through basis.


NET INCOME - NGTL SYSTEM AND CANADIAN MAINLINE

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)              2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
NGTL System                                92        81        261       233
Canadian Mainline                          49        52        149       154
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Net income for the NGTL System increased by $11 million and $28 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 mainly due to a higher average investment base and higher OM&A incentive earnings, partially offset by higher carrying charges on regulatory deferrals in 2017. The NGTL System is operating under the two-year 2016-2017 Revenue Requirement Settlement which includes an ROE of 10.1 per cent on 40 per cent deemed equity and a mechanism for sharing variances above and below a fixed annual OM&A amount with flow-through treatment of all other costs.

Net income for the Canadian Mainline decreased by $3 million for the three months ended September 30, 2017 compared to the same period in 2016 primarily due to a lower average investment base and lower incentive earnings. Net income decreased by $5 million for the nine months ended September 30, 2017 compared to the same period in 2016 primarily due to a lower average investment base and higher carrying charges on regulatory deferrals, partially offset by higher incentive earnings. The Canadian Mainline is operating under the NEB 2014 Decision which includes an approved ROE of 10.1 per cent on a 40 per cent deemed equity with a possible range of achieved outcomes between 8.7 per cent and 11.5 per cent. The decision also includes an incentive mechanism that has both upside and downside risk and a $20 million annual after-tax contribution from TransCanada.

DEPRECIATION AND AMORTIZATION

Depreciation and amortization increased by $8 million and $17 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 mainly due to facilities that were placed in service for the NGTL System and Canadian Mainline.


OPERATING STATISTICS - NGTL SYSTEM AND CANADIAN MAINLINE

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                              Canadian
nine months ended September 30        NGTL System(1)        Mainline(2 )
                                   -------------------- --------------------
(unaudited)                              2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Average investment base (millions
 of $)                                  8,210     7,401      4,165     4,423
Delivery volumes (Bcf):
  Total                                 3,015     2,978      1,244     1,217
  Average per day                        11.0      10.9        4.6       4.4
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Field receipt volumes for the NGTL System for the nine months ended
    September 30, 2017 were 3,111 Bcf (2016 - 3,080 Bcf). Average per day
    was 11.4 Bcf (2016 - 11.2 Bcf).
(2) Canadian Mainline's throughput volumes represent physical deliveries to
    domestic and export markets. Physical receipts originating at the
    Alberta border and in Saskatchewan for the nine months ended September
    30, 2017 were 716 Bcf (2016 - 802 Bcf). Average per day was 2.6 Bcf
    (2016 - 2.9 Bcf).

U.S. Natural Gas Pipelines

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented earnings (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of US$,
 unless otherwise noted)                2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Columbia Gas(1)                          125       123        446       123
ANR                                       86        76        301       233
TC PipeLines, LP(2,3)                     25        32         83        90
Great Lakes(4)                             9        11         49        48
Midstream(1)                              27        26         70        26
Columbia Gulf(1)                          16        11         55        11
Other U.S. pipelines(1,2,3,5)             23        22         78        46
Non-controlling interests(6)              74        94        257       264
Business development                       -        (1)        (1)       (2)
----------------------------------------------------------------------------
Comparable EBITDA                        385       394      1,338       839
Depreciation and amortization           (116)     (104)      (340)     (204)
----------------------------------------------------------------------------
Comparable EBIT                          269       290        998       635
Foreign exchange impact                   68        94        311       208
----------------------------------------------------------------------------
Comparable EBIT (Cdn$)                   337       384      1,309       843
Specific items:
  Integration and acquisition
   related costs - Columbia                -       (52)       (10)      (52)
  TC Offshore loss on sale                 -         -          -        (4)
----------------------------------------------------------------------------
Segmented earnings (Cdn$)                337       332      1,299       787
----------------------------------------------------------------------------
----------------------------------------------------------------------------


(1) We completed the acquisition of Columbia on July 1, 2016 and the
    publicly held units of Columbia Pipeline Partners LP (CPPL) on February
    17, 2017.
(2) Results from Northern Border and Iroquois reflect our share of equity
    income from these investments. We acquired additional interests in
    Iroquois of 0.65 per cent on May 1, 2016 and 4.87 per cent on March 31,
    2016. TC PipeLines, LP acquired TransCanada's 49.34 per cent interest in
    Iroquois and its remaining 11.81 per cent interest in PNGTS on June 1,
    2017.
(3) TC PipeLines, LP periodically conducts at-the-market equity issuances
    which decrease our ownership in TC PipeLines, LP. The following shows
    our ownership interest in TC PipeLines, LP and our effective ownership
    interest of Great Lakes and PNGTS through our ownership interest in TC
    PipeLines, LP for the periods presented.

     -----------------------------------------------------------------------
     -----------------------------------------------------------------------
                                              Effective ownership percentage
                                                           as of
                                                September 30,  September 30,
                                                         2017           2016
     -----------------------------------------------------------------------
     -----------------------------------------------------------------------
     TC PipeLines, LP                                    26.0           27.1
     Effective ownership through TC PipeLines,
      LP:
     Great Lakes                                         12.1           12.6
     PNGTS                                               16.1           13.5
     -----------------------------------------------------------------------
     -----------------------------------------------------------------------
(4) Represents our 53.6 per cent direct interest in Great Lakes. The
    remaining 46.4 per cent is held by TC PipeLines, LP.
(5) Includes our effective ownership in Millennium and Hardy Storage and our
    direct ownership in Iroquois and PNGTS up to June 1, 2017.
(6) Comparable EBITDA for the portions of TC PipeLines, LP, PNGTS and CPPL
    that we do not own. Effective February 17, 2017, we acquired the
    remaining publicly held units of CPPL.

U.S. Natural Gas Pipelines segmented earnings increased by $5 million and $512 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 primarily due to the acquisition of Columbia.

Segmented earnings for the nine months ended September 30, 2017 included a first quarter $10 million pre-tax charge primarily due to integration-related costs associated with the Columbia acquisition. Segmented earnings for the nine months ended September 30, 2016 included a $52 million pre-tax charge primarily due to integration and acquisition-related costs associated with the Columbia acquisition and a $4 million pre-tax loss as a result of a December 2015 agreement to sell TC Offshore which closed in early 2016. These amounts have been excluded from our calculation of comparable EBIT. As well, a weaker U.S. dollar had a negative impact on the Canadian dollar equivalent segmented earnings from our U.S. operations.

Earnings from our U.S. Natural Gas Pipelines operations, which include Columbia effective July 1, 2016, are generally affected by contracted volume levels, volumes delivered and the rates charged as well as by the cost of providing services. Columbia and ANR results are also affected by the contracting and pricing of their storage capacity and commodity sales. Transmission and storage revenues are generally higher in winter months due to increased seasonal demand for our services.

Comparable EBITDA for U.S. Natural Gas Pipelines decreased by US$9 million for the three months ended September 30, 2017 compared to the same period in 2016. This was primarily the net effect of:


--  the timing of funding contributions to the Columbia Gas defined benefit
    pension plan. Under the current rate settlement for Columbia Gas,
    pension costs are reflected in expense as funding occurs and the full
    2017 pension funding for this plan was recorded in third quarter 2017
--  increased revenue from Columbia Gas growth projects
--  higher ANR transportation and storage revenue resulting from a FERC-
    approved rate settlement effective August 1, 2016.

Comparable EBITDA for U.S. Natural Gas Pipelines increased by US$499 million for the nine months ended September 30, 2017 compared to the same period in 2016. This was primarily the net effect of:


--  the earnings contribution resulting from the Columbia acquisition for
    nine months in 2017 compared to only three months in 2016
--  higher ANR transportation and storage revenue resulting from a FERC-
    approved rate settlement effective August 1, 2016.

DEPRECIATION AND AMORTIZATION

Depreciation and amortization increased by US$12 million and US$136 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 mainly due to the acquisition of Columbia and higher depreciation rates on ANR following the FERC-approved rate settlement effective August 1, 2016.

US$5 million of first quarter 2017 depreciation related to Columbia information system assets retired as part of the Columbia integration process has been excluded from comparable EBIT and included as part of integration and acquisition related costs to arrive at segmented earnings.

Mexico Natural Gas Pipelines

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented earnings (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of US$,
 unless otherwise noted)                2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Topolobampo                               39        41        119        40
Tamazunchale                              29        24         85        79
Guadalajara                               17        17         51        49
Mazatlan                                  16         -         49         -
Sur de Texas(1)                            3         -         14         -
Other(2)                                 (10)        -        (10)        -
Business development                       -         1          -        (4)
----------------------------------------------------------------------------
Comparable EBITDA                         94        83        308       164
Depreciation and amortization            (18)      (10)       (54)      (23)
----------------------------------------------------------------------------
Comparable EBIT                           76        73        254       141
Foreign exchange impact                   19        25         79        43
----------------------------------------------------------------------------
Comparable EBITand segmented
 earnings (Cdn$)                          95        98        333       184
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Represents our 60 per cent equity interest in a joint venture with
    IEnova to build, own and operate the Sur de Texas pipeline.
(2) Reflects results from our 46.5 per cent equity investment in TransGas.
    On August 25, 2017, TransGas transferred all of its pipeline assets to
    Transportadora de Gas Internacional S.A..

Mexico Natural Gas Pipelines segmented earnings decreased by $3 million and increased $149 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and are equivalent to comparable EBIT. Aside from commercial factors outlined below, a weaker U.S. dollar had a negative impact on the Canadian dollar equivalent segmented earnings from our Mexico operations.

Earnings from our Mexico operations are underpinned by long-term, stable, primarily U.S. dollar-denominated revenue contracts, and are affected by the cost of providing service.

Comparable EBITDA for Mexico Natural Gas Pipelines increased by US$11 million and US$144 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and was the net effect of:


--  incremental earnings from Topolobampo on a year-to-date basis. The
    Topolobampo project has experienced a delay in construction which, under
    the terms of our Transportation Service Agreement (TSA) with the CFE,
    constitutes a force majeure event with provisions allowing for the
    collection and recognition of revenue as per the original TSA service
    commencement date of July 2016
--  incremental earnings from Mazatlan. Construction is complete and the
    collection and recognition of revenue began as per the terms of the TSA
    in December 2016
--  equity earnings from our investment in the Sur de Texas pipeline which
    records AFUDC during construction, net of interest expense on an inter-
    affiliate loan from TransCanada
--  the impairment of our equity investment in TransGas. See Recent
    developments section for further detail.

DEPRECIATION AND AMORTIZATION

Depreciation and amortization increased by US$8 million and US$31 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 primarily due to the commencement of depreciation on Topolobampo and Mazatlan.

Liquids Pipelines

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented earnings (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


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                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Keystone Pipeline System                 302       280        937       856
Business development and other             1        (2)        10        (6)
----------------------------------------------------------------------------
Comparable EBITDA                        303       278        947       850
Depreciation and amortization            (71)      (73)      (228)     (214)
----------------------------------------------------------------------------
Comparable EBIT                          232       205        719       636
Specific items:
  Keystone XL asset costs                (10)      (14)       (23)      (37)
  Risk management activities             (19)       (8)       (15)       (6)
----------------------------------------------------------------------------
Segmented earnings                       203       183        681       593
----------------------------------------------------------------------------

Comparable EBIT denominated as
 follows:
Canadian dollars                          63        51        175       160
U.S. dollars                             135       117        416       360
Foreign exchange impact                   34        37        128       116
----------------------------------------------------------------------------
                                         232       205        719       636
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Liquids Pipelines segmented earnings increased by $20 million and $88 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and included pre-tax charges related to Keystone XL costs for the maintenance of project assets which are being expensed pending further advancement of the project as well as unrealized losses from changes in the fair value of derivatives related to our liquids marketing business.

Keystone Pipeline System earnings are generated primarily by providing pipeline capacity to shippers for fixed monthly payments that are not linked to actual throughput volumes. Uncontracted capacity is offered to the market on a spot basis and provides opportunities to generate incremental earnings.

Comparable EBITDA for Liquids Pipelines increased by $25 million and $97 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and was the net effect of:


--  higher volumes on Keystone pipeline
--  higher contribution from liquids marketing activities
--  contribution from Grand Rapids pipeline, which was placed in service in
    late-August 2017
--  increased business development activities, including advancement of
    Keystone XL
--  a weaker U.S. dollar which had a negative impact on the Canadian dollar
    equivalent comparable earnings from our U.S. operations.

DEPRECIATION AND AMORTIZATION

Depreciation and amortization increased by $14 million for the nine months ended September 30, 2017 compared to the same period in 2016 as a result of the timing of new facilities being placed in service, partially offset by the effect of a weaker U.S. dollar.

Energy

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented earnings (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


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----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian Power
Western Power(1)                          24        26         77        48
Eastern Power                             75        81        252       267
Bruce Power                               91        76        314       210
----------------------------------------------------------------------------
Canadian Power - comparable
 EBITDA(1,2)                             190       183        643       525
Depreciation and amortization            (35)      (36)      (108)     (119)
----------------------------------------------------------------------------
Canadian Power-comparable EBIT(1,2)      155       147        535       406
----------------------------------------------------------------------------
U.S. Power (US$)
U.S. Power - comparable EBITDA(3)         22       164        108       321
Depreciation and amortization(4)           -       (34)         -       (98)
----------------------------------------------------------------------------
U.S. Power - comparable EBIT              22       130        108       223
Foreign exchange impact                    7        44         34        72
----------------------------------------------------------------------------
U.S. Power-comparable EBIT (Cdn$)         29       174        142       295
----------------------------------------------------------------------------

Natural Gas Storage and other -
 comparable EBITDA                         8        20         40        38
Depreciation and amortization             (4)       (3)       (10)       (9)
----------------------------------------------------------------------------
Natural Gas Storage and other -
 comparable EBIT                           4        17         30        29
----------------------------------------------------------------------------

Business Development comparable
 EBITDA and EBIT                          (3)       (3)        (9)      (11)
----------------------------------------------------------------------------
Energy-comparable EBIT(1,2,3)            185       335        698       719
Specific items:
  Net (loss)/gain on sales of U.S.
   Northeast power assets                (12)       (5)       469        (5)
  Ravenswood goodwill impairment           -    (1,085)         -    (1,085)
  Alberta PPA terminations                 -         -          -      (240)
  Risk management activities              64       (73)       (87)       28
----------------------------------------------------------------------------
Segmented earnings/(losses)(1,2,3)       237      (828)     1,080      (583)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Included losses from the Alberta PPAs up to March 7, 2016 when the PPAs
    were terminated.
(2) Includes our share of equity income from our investments in Portlands
    Energy and Bruce Power.
(3) TC Hydro earnings included up to April 19, 2017 sale date; Ravenswood,
    Ironwood, Ocean State Power and Kibby Wind earnings included up to June
    2, 2017 sale date.
(4) Depreciation of U.S. Northeast power assets ceased effective November
    2016 when classified as held for sale.

Energy segmented earnings increased by $1,065 million and $1,663 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 and included the following specific items:


--  in 2017, a net gain of $469 million before tax related to the
    monetization of our U.S. Northeast power business which included a $715
    million gain on the sale of TC Hydro, a loss of $226 million on the sale
    of the thermal and wind package and $20 million (2016 - $5 million) of
    pre-tax disposition costs. See Recent developments section for more
    details
--  in 2016, a $1,085 million pre-tax impairment charge on the Ravenswood
    goodwill. As a result of information received during the process to
    monetize our U.S. Northeast Power business, it was determined that the
    fair value of Ravenswood no longer exceeded its carrying value
--  in 2016, a $240 million pre-tax charge, which included a $29 million
    impairment of our equity investment in ASTC Power Partnership, on the
    carrying value of our Alberta PPAs as a result of our decision to
    terminate the PPAs
--  unrealized gains and losses from changes in the fair value of
    derivatives used to reduce our exposure to certain commodity price risks
    as follows:

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
Risk management activities             September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, pre-
 tax)                                    2017     2016       2017       2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Canadian Power                              1       (4)         5          3
U.S. Power                                 59      (73)       (97)        16
Natural Gas Storage                         4        4          5          9
----------------------------------------------------------------------------
Total unrealized gains/(losses)
 from risk management activities           64      (73)       (87)        28
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The variances in these unrealized gains and losses reflect the impact of changes in forward natural gas and power prices and the volume of our positions for these derivatives over a certain period of time, however, they do not accurately reflect the gains and losses that will be realized on settlement, or the offsetting impacts of other derivative and non-derivative transactions that make up our business as a whole. As a result, we do not consider them reflective of our underlying operations.

The remainder of the Energy segmented earnings are equivalent to comparable EBIT and are discussed in the following sections.

CANADIAN POWER

Western and Eastern Power

The following are the components of comparable EBITDA and comparable EBIT.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Revenues(1)
Western Power                             39        43        128       167
Eastern Power                            103       112        301       315
Other(2)                                   4         2         24        31
----------------------------------------------------------------------------
                                         146       157        453       513
Income from equity investments             8         9         23        16
Commodity purchases resold                 -        (1)        (2)      (60)
Plant operating costs and other          (55)      (58)      (145)     (154)
----------------------------------------------------------------------------
Comparable EBITDA(3)                      99       107        329       315
Depreciation and amortization            (35)      (36)      (108)     (119)
----------------------------------------------------------------------------
Comparable EBIT(3)                        64        71        221       196
----------------------------------------------------------------------------
Breakdown of comparable EBITDA
Western Power(3)                          24        26         77        48
Eastern Power                             75        81        252       267
----------------------------------------------------------------------------
Comparable EBITDA(3)                      99       107        329       315
----------------------------------------------------------------------------
Plant availability(4)
Western Power                             94%       94%        96%       92%
Eastern Power                             97%       96%        96%       93%
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Includes the realized gains and losses from financial derivatives used
    to manage Canadian Power's assets which are presented on a net basis in
    Western and Eastern Power revenues. The unrealized gains and losses from
    financial derivatives have been excluded to arrive at comparable EBITDA.
(2) Includes revenues from the sale of unused natural gas transportation and
    sale of excess natural gas purchased for generation.
(3) Included Alberta PPAs up to March 7, 2016 when the PPAs were terminated.
(4) The percentage of time the plant was available to generate power,
    regardless of whether it was running.

Western Power

Comparable EBITDA for Western Power increased by $29 million for the nine months ended September 30, 2017 compared to the same period in 2016. Results from the Alberta PPAs are included up to March 7, 2016 when we terminated the PPAs for the Sundance A, Sundance B and Sheerness facilities.

Eastern Power

Comparable EBITDA for Eastern Power decreased by $6 million and $15 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 mainly due to lower earnings from our renewable assets and from the Ontario gas-fired plants due to reduced ancillary revenue opportunities. Lower earnings from the sale of unused natural gas transportation also contributed to the decreased earnings for the nine months ended September 30, 2017 compared to the same period in 2016.

DEPRECIATION AND AMORTIZATION

Depreciation and amortization decreased by $11 million for the nine months ended September 30, 2017 compared to the same period in 2016 following the termination of the Alberta PPAs.

Bruce Power

Bruce Power results reflect our proportionate share. The following is our proportionate share of the components of comparable EBITDA and comparable EBIT.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, unless
 noted otherwise)                       2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Equity income included in
 comparable EBITDA and EBIT
 comprised of:
  Revenues                               383       369      1,212     1,109
  Operating expenses                    (205)     (208)      (638)     (658)
  Depreciation and other                 (87)      (85)      (260)     (241)
----------------------------------------------------------------------------
Comparable EBITDA and EBIT(1)             91        76        314       210
----------------------------------------------------------------------------
Bruce Power - other information
Plant availability(2)                     86%       88%        89%       82%
Planned outage days                       81        50        178       335
Unplanned outage days                     19        37         39        49
Sales volumes (GWh)(1)                 5,801     5,886     18,093    16,420
Realized sales price per MWh(3)          $67       $67        $67       $67
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Represents our 48.4 per cent (2016 - 48.5 per cent) ownership interest
    in Bruce Power. Sales volumes include deemed generation.
(2) The percentage of time the plant was available to generate power,
    regardless of whether it was running.
(3) Calculation based on actual and deemed generation. Realized sales prices
    per MWh includes realized gains and losses from contracting activities
    and cost flow-through items. Excludes unrealized gains and losses on
    contracting activities and non-electricity revenues.

Comparable EBITDA from Bruce Power increased by $15 million for the three months ended September 30, 2017 compared to the same period in 2016 due to improved results from contracting activities partially offset by lower volumes resulting from increased planned outage days.

Comparable EBITDA from Bruce Power increased by $104 million for the nine months ended September 30, 2017 compared to the same period in 2016 due to higher volumes resulting from fewer planned outage days and higher gains from contracting activities, partially offset by higher interest expense.

Planned outage work, which commenced on Unit 3 in August 2017, was completed in September 2017. Planned maintenance on Unit 6 began in September 2017 and is scheduled to be completed in fourth quarter 2017. The overall average plant availability percentage in 2017 is expected to be approximately 90 per cent.

U.S. POWER

In second quarter 2017, we completed the sale of our U.S. Power generation assets and initiated the wind down of our U.S. power marketing operations. See Recent developments section for more details.

NATURAL GAS STORAGE AND OTHER

Comparable EBITDA for Natural Gas Storage and other decreased by $12 million for the three months ended September 30, 2017 compared to the same period in 2016 mainly due to lower realized natural gas storage price spreads.

Corporate

The following is a reconciliation of comparable EBITDA and comparable EBIT (our non-GAAP measures) to segmented losses (the equivalent GAAP measure). Certain costs previously reported in our Corporate segment are now being reported within the business segments to better align with how we measure our financial performance. 2016 results have been adjusted to reflect this change.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Comparable EBITDA and EBIT                (4)        8        (20)        7
Specific items:
  Integration and acquisition
   related costs - Columbia              (32)      (44)       (81)      (80)
  Foreign exchange gain/(loss) -
   inter-affiliate loan(1)                 7         -         (1)        -
  Restructuring costs                      -         -          -       (14)
----------------------------------------------------------------------------
Segmented losses                         (29)      (36)      (102)      (87)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Reported in Income from equity investments on the condensed consolidated
    statement of income.

Corporate segmented losses decreased by $7 million for the three months ended September 30, 2017, and increased by $15 million for the nine months ended September 30, 2017 compared to the same periods in 2016 and included the following specific items that have been excluded from comparable EBIT:


--  integration and acquisition costs associated with the acquisition of
    Columbia
--  foreign exchange on an inter-affiliate loan, which is offset in Interest
    income and other. This peso-denominated loan to the Sur de Texas project
    represents our proportionate share of its financing
--  in 2016, restructuring costs related to expected future losses under
    lease commitments.

Comparable EBITDA decreased by $12 million and $27 million for the three and nine months ended September 30, 2017, respectively, compared to the same periods in 2016 primarily due to increased legal and other general and administrative costs recorded in 2017.

OTHER INCOME STATEMENT ITEMS


Interest expense

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Interest on long-term debt and
 junior subordinated notes
Canadian dollar-denominated             (130)     (122)      (356)     (343)
U.S. dollar-denominated                 (314)     (315)      (954)     (811)
Foreign exchange impact                  (79)     (102)      (293)     (260)
----------------------------------------------------------------------------
                                        (523)     (539)    (1,603)   (1,414)
Other interest and amortization
 expense                                 (29)      (23)       (74)      (60)
Capitalized interest                      49        46        150       133
----------------------------------------------------------------------------
Interest expense included in
 comparable earnings                    (503)     (516)    (1,527)   (1,341)
Specific items:
  Integration and acquisition
   related costs - Columbia                -        (6)         -      (115)
  Risk management activities              (1)        -         (1)        -
----------------------------------------------------------------------------
Interest expense                        (504)     (522)    (1,528)   (1,456)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Interest expense decreased by $18 million in the three months ended September 30, 2017 compared to the same period in 2016 and primarily reflects the net effect of:


--  final repayment of the Columbia acquisition bridge facilities in June
    2017
--  long-term debt and junior subordinated notes issuances, net of
    maturities
--  the impact of a weaker U.S. dollar in translating U.S. dollar
    denominated interest.

Interest expense increased by $72 million for the nine months ended September 30, 2017 compared to the same period in 2016 and primarily reflects the net effect of:


--  long-term debt and junior subordinated notes issuances, partially offset
    by Canadian and U.S. dollar-denominated debt maturities
--  debt assumed in the acquisition of Columbia on July 1, 2016
--  higher capitalized interest on the Napanee power generating facility and
    LNG projects
--  in 2016, the dividend equivalent payments on the subscription receipts
    issued to partially fund the Columbia acquisition
--  the impact of a weaker U.S. dollar in translating U.S. dollar
    denominated interest.


Allowance for funds used during construction
----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)              2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian dollar-denominated                44        44        149       133
U.S. dollar-denominated                    81        55        168       149
Foreign exchange impact                    20        11         50        40
----------------------------------------------------------------------------
Allowance for funds used during
 construction                             145       110        367       322
----------------------------------------------------------------------------
----------------------------------------------------------------------------

AFUDC increased by $35 million and $45 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016. The year-to-date increase in Canadian dollar-denominated AFUDC is primarily due to continued investment in our NGTL System expansions. The increase in U.S. dollar-denominated AFUDC for both the three and nine months ended September 30, 2017 is primarily due to continued investment and higher rates on projects acquired as part of the Columbia acquisition on July 1, 2016, as well as additional investment in Mexico projects, partially offset by the commercial in-service of Topolobampo and completion of Mazatlan construction.



Interest income and other

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017       2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Interest income and other included
 in comparable earnings                   58         12        103        63
Specific items:
  Integration and acquisition
   related costs - Columbia                -          -          -         6
  Foreign exchange (loss)/gain -
   inter-affiliate loan                   (7)         -          1         -
  Risk management activities              33          -         89        49
----------------------------------------------------------------------------
Interest income and other                 84         12        193       118
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Interest income and other increased by $72 million for the three months ended September 30, 2017 compared to the same period in 2016 and was primarily the net effect of:


--  realized gains in 2017 compared to losses in 2016 on derivatives used to
    manage our net exposure to foreign exchange rate fluctuations on U.S.
    dollar-denominated income
--  $10 million of income recognized on the termination of the PRGT project,
    mainly related to the recovery of carrying costs. See Recent
    developments section for more information
--  interest income and foreign exchange impact related to an inter-
    affiliate loan receivable from the Sur de Texas joint venture. The
    foreign exchange impact is offset in Corporate segmented losses and is
    excluded from comparable earnings
--  higher unrealized gains on risk management activities in 2017 compared
    to 2016. These amounts have been excluded from comparable earnings.

Interest income and other increased by $75 million for the nine months ended September 30, 2017 compared to the same period in 2016 and was primarily the net effect of:


--  income of $20 million related to Coastal GasLink project costs incurred
    to date and $10 million recognized on the termination of the PRGT
    project, mainly related to the recovery of carrying costs. See Recent
    developments section for more information
--  lower realized gains in 2017 compared to 2016 on derivatives used to
    manage our net exposure to foreign exchange rate fluctuations on U.S.
    dollar-denominated income
--  foreign exchange impact on the translation of foreign currency
    denominated working capital balances
--  interest income and foreign exchange impact related to an inter-
    affiliate loan receivable from the Sur de Texas joint venture. The
    foreign exchange impact is offset in Corporate segmented losses and is
    excluded from comparable earnings
--  higher unrealized gains on risk management activities in 2017 compared
    to 2016. These amounts have been excluded from comparable earnings.


Income tax expense

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Income tax expense included in
 comparable earnings                    (163)     (261)      (605)     (630)
Specific items:
  Ravenswood goodwill impairment           -       429          -       429
  Sales of U.S. Northeast power
   assets                                  -         2       (226)        2
  Integration and acquisition
   related costs - Columbia                2        32         22        32
  Keystone XL asset costs                  2         5          4        13
  Keystone XL income tax recoveries        -        28          7        28
  Alberta PPA terminations                 -         -          -        64
  Restructuring costs                      -         -          -         4
  TC Offshore loss on sale                 -         -          -         1
  Risk management activities             (29)       31         17       (21)
----------------------------------------------------------------------------
Income tax (expense)/recovery           (188)      266       (781)      (78)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Income tax expense included in comparable earnings decreased by $98 million for the three months ended September 30, 2017 compared to the same periods in 2016 mainly as a result of lower comparable pre-tax earnings in 2017 compared to 2016 and changes in the proportion of income earned between Canadian and foreign jurisdictions.

Income tax expense included in comparable earnings decreased by $25 million for the nine months ended September 30, 2017 compared to the same period in 2016 mainly as a result of changes in the proportion of income earned between Canadian and foreign jurisdictions and lower flow-through taxes in 2017 on Canadian rate-regulated pipelines, partially offset by higher pre-tax earnings in 2017 compared to 2016.


Net income attributable to non-controlling interests

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Net income attributable to non-
 controlling interests included in
 comparable earnings                     (44)      (55)      (189)     (187)
Specific items:
  Acquisition related costs -
   Columbia                                -         3          -         3
----------------------------------------------------------------------------
Net income attributable to non-
 controlling interests                   (44)      (52)      (189)     (184)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Net income attributable to non-controlling interests decreased by $8 million and increased by $5 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 primarily due to the acquisition of Columbia in July 2016 which included a non-controlling interest in CPPL. In February 2017, we acquired all of the outstanding publicly held common units of CPPL.


Preferred share dividends

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Preferred share dividends                (40)      (27)      (120)      (77)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Preferred share dividends increased by $13 million and $43 million for the three and nine months ended September 30, 2017 compared to the same periods in 2016 primarily due to the issuance of Series 13 and Series 15 preferred shares in April 2016 and November 2016, respectively.

Recent developments

CANADIAN NATURAL GAS PIPELINES

NGTL System

In June 2017, we announced an additional $2 billion expansion program on our NGTL System based on new contracted customer demand for approximately 3.2 PJ/d (3.0 Bcf/d) of incremental firm receipt and delivery services. We also successfully concluded an expansion open season for incremental service at the Alberta/British Columbia export delivery point, which connects Canadian supply through our downstream pipelines to Pacific Northwest, California and Nevada markets. The open season was over-subscribed and all 408 TJ/d (381 MMcf/d) of available expansion service was awarded under long-term contracts.

The additional expansion program increased our overall near-term capital program on the NGTL System to $7.1 billion, with completion to 2021.

Towerbirch Expansion

In March 2017, the Government of Canada approved the $0.4 billion Towerbirch Expansion project included in the $7.1 billion expansion of the NGTL System noted above. The project consists of 55 km (34 miles) of 36-inch loop to the Groundbirch Mainline plus 32 km (20 miles) of new 30-inch pipe and four new meter stations. This project was placed in service on November 1, 2017.

North Montney

In March 2017, we filed an application with the NEB for a variance to the existing approvals for the North Montney project on the NGTL System to remove the condition that the project could only proceed once a positive FID is made for the Pacific Northwest LNG project. North Montney is now underpinned by restructured, 20-year commercial contracts with shippers and is not dependent on the LNG project proceeding. On April 19, 2017, the NEB granted an interim extension to March 31, 2018 of the sunset clause that was due to expire June 10, 2017. In-service dates are planned for April 2019 and April 2020, subject to regulatory approval.

On September 7, 2017, the NEB provided notice that a public hearing process would be used to consider our variance application. The NEB also stated it would consider the continued appropriateness and applicability of the tolling decisions and associated conditions of the original approval. On October 26, 2017, the NEB issued the Hearing Order indicating the oral portion of the hearing will begin the week of January 22, 2018 with a decision to follow within 12 weeks after the hearing conclusion.

NGTL 2018 Revenue Requirement

NGTL's current two-year settlement, which established revenue requirements for the system, expires on December 31, 2017. NGTL is negotiating with its shippers for its revenue requirements for 2018 and potentially beyond. On October 31, 2017, we filed an application with the NEB for interim tolls effective January 1, 2018.

Canadian Mainline

Dawn Long-Term Fixed Price Service (LTFP)

In March 2017, we announced the successful conclusion of the long-term fixed-price open season on the Canadian Mainline for service from the Empress receipt point in Alberta to the Dawn hub in Southern Ontario. The open season resulted in binding, long-term contracts from WCSB gas producers to transport 1.5 PJ/d (1.4 Bcf/d) of natural gas at a simplified toll of $0.77/GJ. The term of each contract is 10 years and includes early termination rights that can be exercised following the initial five years of service and upon payment of an increased toll for the final two years of the contract. The application to the NEB for approval of the service was filed on April 26, 2017.

On September 21, 2017, the NEB approved this application, as filed, with an effective date of November 1, 2017. This new service provides our customers with toll certainty and improved market access enabling them to compete effectively with emerging supplies of natural gas from the Marcellus and Utica basins.

Canadian Mainline 2018 - 2020 Toll Review

The Canadian Mainline is required to file for approval of 2018-2020 tolls by December 31, 2017. Tolls were previously established for 2015 to 2017 in accordance with the terms of the 2015-2030 LDC Settlement. While the settlement specified tolls for the 2015 to 2020 period, the NEB ordered a toll review halfway through this six-year period. The review must include costs, forecast volumes, contracting levels, the deferral account balance, and any other material changes.

Maple Compressor Expansion Project

The Canadian Mainline has received requests for expansion capacity to the southern Ontario market plus delivery to Atlantic Canada via the TQM and PNGTS systems. The requests for approximately 86 TJ/d (80 MMcf/d) of firm service underpin the need for new compression at the existing Maple compressor site. Customers have executed 15-year precedent agreements to proceed with the project which has a revised estimated cost of $110 million. An application to the NEB for approval to proceed with the project is planned for fourth quarter 2017 to meet a November 1, 2019 in-service date.

Coastal GasLink

The continuing delay in the FID for the LNG Canada project triggered a restructuring of provisions in the Coastal GasLink project agreement with LNG Canada that results in the payment of certain amounts to TransCanada with respect to carrying charges on costs incurred. In September 2017, an approximate $80 million payment was received related to costs incurred since inception of the project, and quarterly payments of approximately $7 million will be received until further notice. We continue to work with LNG Canada under the agreement towards a FID.

Prince Rupert Gas Transmission

In July 2017, we were notified that PNW LNG would not be proceeding with their proposed LNG project and that Progress Energy (Progress) would be terminating their agreement with us for development of the PRGT project, effective August 10, 2017. In accordance with the terms of the agreement, all project costs incurred to advance the project, including carrying charges, are fully recoverable upon termination. As a result, we received a payment of $0.6 billion from Progress in October 2017.

U.S. NATURAL GAS PIPELINES

Leach XPress Project

The Leach XPress project is expected to have a US$100 million increase in its capital project cost due to delays caused by weather on the project's construction schedule and the resulting increase in contractor costs. Leach XPress is expected to be placed in service in early January 2018.

Rayne XPress Project

Rayne Xpress was placed in service November 2, 2017. This Columbia Gulf project will transport approximately 1.1 PJ/d (1.0 Bcf/d) of supply from an interconnect with the Leach XPress pipeline project, and another interconnect, to markets along the system and to the Gulf Coast.

Mountaineer XPress Project

The Mountaineer XPress project is expected to have a US$600 million increase in its capital project cost due to increased construction cost estimates. As a result of a cost sharing mechanism, overall project returns are not anticipated to be materially affected. Mountaineer XPress is expected to be placed in service in fourth quarter 2018.

Midstream - Gibraltar Pipeline Project

The Gibraltar Midstream project, a 1,000 TJ/d (934 MMcf/d) dry gas header pipeline in southwest Pennsylvania, was placed in service November 1, 2017.

Buckeye XPress Project

The Buckeye XPress project (BXP) represents an upsizing of an existing pipeline replacement project under our Columbia Gas modernization program. The US$0.2 billion cost to upsize the replacement pipe and install compressor upgrades will enable us to offer 290 TJ/d (275 MMcf/d) of incremental pipeline capacity to accommodate growing Appalachian production. We expect BXP to be placed in service in late 2020.

Portland XPress Project

PNGTS has executed Precedent Agreements with several LDCs in New England and Atlantic Canada to re-contract certain system capacity set to expire in 2019, as well as expand the PNGTS system to bring its certificated capacity up to 280 TJ/d (265 MMcf/d). The approximately US$80 million Portland XPress Project (PXP) will proceed concurrently with upstream capacity expansions. The in-service dates of PXP are being phased-in over a three year period beginning November 1, 2018.

FERC Update

The FERC regained a quorum of three commissioners in August 2017 and two additional commissioners were approved by the U.S. Senate on November 2, 2017. The FERC has stated that it intends to expeditiously address the resulting backlog of pending applications. We expect the FERC certificates for the WB XPress, Mountaineer XPress and Gulf XPress projects to be received in fourth quarter 2017.

Great Lakes

Rate Case

On October 30, 2017, Great Lakes filed a rate settlement with the FERC to satisfy its obligations from its 2013 rate settlement for new rates to be in effect by January 1, 2018. The 2017 Great Lakes Settlement, if approved by the FERC, will decrease Great Lakes' maximum transportation rates by 27 per cent beginning October 1, 2017. Great Lakes expects that the impact from other changes, including the recent long-term transportation contract with the Canadian Mainline as described below, other revenue opportunities on the system and the elimination of the revenue sharing mechanism with its customers, will more than offset the full year impact of the reduction in Great Lakes' rates beginning in 2018. The 2017 Great Lakes Settlement does not contain any moratorium and Great Lakes will be required to file for new rates no later than March 31, 2022, with new rates to be effective October 1, 2022.

Impact of Dawn LTFP

In conjunction with the Canadian Mainline's LTFP service, Great Lakes entered into a new 10-year gas transportation contract with the Canadian Mainline. This contract received NEB approval in September 2017 and became effective on November 1, 2017. This contract contains volume reduction options up to full contract quantity beginning in year three.

Northern Border Settlement

Northern Border and its shippers have been engaged in settlement discussions and have recently agreed to a settlement-in-principle addressing all rate and service related issues raised during the settlement discussions. Northern Border plans to file a settlement agreement with the FERC before the end of the year, reflecting the settlement-in-principle, precluding the need to file a general rate case as contemplated by its 2012 settlement. Northern Border anticipates that the FERC will accept the settlement agreement and that it will be unopposed. This will provide Northern Border with rate stability over the longer term. At this time, we do not believe that the final outcome of the settlement will have a material impact on our consolidated results. We have a 13 per cent indirect ownership interest in Northern Border through TC PipeLines, LP.

Sale of Iroquois and PNGTS to TC PipeLines, LP

In June 2017, we closed the sale of a 49.34 per cent interest in Iroquois Gas Transmission System, LP and our remaining 11.81 per cent interest in PNGTS to TC PipeLines, LP valued at US$765 million. Proceeds were comprised of US$597 million in cash and US$168 million representing a proportionate share of Iroquois and PNGTS debt.

Columbia Pipeline Partners LP

In February 2017, we completed the acquisition, for cash, of all outstanding publicly held common units of CPPL at a price of US$17.00 and a stub period distribution payment of US$0.10 per common unit for an aggregate transaction value of US$921 million.

MEXICO NATURAL GAS PIPELINES

TransGas

In third quarter 2017, we recognized an impairment charge of $12 million on our 46.5 per cent equity investment in TransGas de Occidente S.A. (TransGas). TransGas constructed and operated a natural gas pipeline in Colombia for a 20-year contract term. As per the terms of the agreement, upon completion of the 20-year contract in August 2017, TransGas transfered its pipeline assets to Transportadora de Gas Internacional S.A.. The impairment charge represents the write-down of the remaining carrying value of our equity investment.

LIQUIDS PIPELINES

Energy East and Related Projects

On September 7, 2017, we requested the NEB suspend the review of the Energy East and Eastern Mainline project applications for 30 days to provide time for us to conduct a careful review of the NEB's changes, announced on August 23, 2017, regarding the list of issues and environmental assessment factors related to the projects and how these changes impact the projects' costs, schedules and viability.

On October 5, 2017, after careful review of the changed circumstances, we informed the NEB that we will not be proceeding with the Energy East and Eastern Mainline project applications. We have also notified Quebec's Ministere du Developpement durable, de l'Environnement, et de la Lutte contre les changements climatiques that we are withdrawing the Energy East project from the environmental review process. As the Energy East pipeline was also to provide transportation services for the Upland pipeline, the U.S. Department of State was notified on October 5, 2017, that we will no longer be pursuing the U.S. Presidential Permit application for that project.

We are reviewing the approximate $1.3 billion carrying value of the projects, including AFUDC capitalized since inception, and expect an estimated $1 billion after-tax non-cash charge will be recorded in our fourth quarter 2017 results. We ceased capitalizing AFUDC on the projects effective August 23, 2017, the date of the NEB's announced scope changes. With Energy East's inability to reach a regulatory decision, no recoveries of costs from third parties are expected.

Keystone XL

In March 2017, the U.S. Department of State issued a U.S. Presidential Permit authorizing construction of the U.S./Canada border crossing facilities of the Keystone XL pipeline. We discontinued our claim under Chapter 11 of the North American Free Trade Agreement and have also withdrawn the U.S. Constitutional challenge. With the receipt of the U.S. Presidential Permit, we will continue to work through the Nebraska PSC process to obtain route approval through that state and with other U.S. federal agencies to obtain ancillary permits.

Given the passage of time since the Keystone XL Presidential Permit application was previously denied in November 2015, we are updating the shipping contracts and anticipate the core contract shipper group will be modified with the introduction of new shippers and reductions in volume commitments by other shippers. We anticipate commercial support for the project to be substantially similar to that which existed when we first applied for a Keystone XL pipeline permit.

In July 2017, we launched an open season to solicit additional binding commitments from interested parties for transportation of crude oil on the Keystone Pipeline and for the Keystone XL pipeline project from Hardisty, Alberta to markets in Cushing, Oklahoma and the U.S. Gulf Coast. On September 6, 2017, we extended this open season to October 26, 2017 due to the impact caused by Hurricane Harvey to Houston, Texas and parts of the U.S. Gulf Coast. We are currently analyzing the results of the open season.

In February 2017, we filed an application with the Nebraska Public Service Commission (PSC) seeking approval for the Keystone XL pipeline route through that state. In August 2017, the Nebraska PSC concluded the public hearing for the Keystone XL pipeline and final written submissions were submitted in September 2017. The Nebraska PSC will review all comments gathered from the public meetings, the written submissions and the hearing before making a final decision on the route permit which is expected by the end of November 2017.

Grand Rapids

In late August 2017, the Grand Rapids pipeline, jointly owned by TransCanada and PetroChina Canada Ltd. (formerly Brion Energy Corporation) was placed in service. The 460 km (287 mile) crude oil transportation system plays a key role in connecting producing areas northwest of Fort McMurray, Alberta, to terminals in the Edmonton/Heartland region.

Northern Courier

Northern Courier, a 90 km (56 mile) pipeline which transports bitumen and diluent between the Fort Hills mine site and Suncor Energy's terminal located north of Fort McMurray, Alberta, achieved commercial in-service on November 1, 2017.

ENERGY

U.S. Power

Monetization of U.S. Northeast power business

In April 2017, we closed the sale of TC Hydro to Great River Hydro, LLC for US$1.07 billion resulting in a gain of $715 million ($440 million after tax) recorded in 2017.

In June 2017, we closed the sale of Ravenswood, Ironwood, Ocean State Power and Kibby Wind to Helix Generation, LLC for US$2.029 billion. An additional loss on sale of approximately $226 million ($183 million after tax) was recorded in 2017, primarily related to an adjustment to the purchase price and repair costs for an unplanned outage at Ravenswood prior to close. Insurance recoveries for a portion of the repair costs are expected to be received by the end of 2017 and will partially reduce this loss.

Proceeds from the sale transactions were used to fully retire the remaining bridge facilities that partially funded the acquisition of Columbia.

After assessing our options, we initiated the wind down of our U.S. power marketing operations and will realize the value of the remaining marketing contracts and working capital over time.

Ontario Solar

On October 24, 2017, we entered into an agreement to sell our Ontario Solar portfolio, comprised of eight facilities with a total generating capacity of 76 MWs, to Axium Infinity Solar LP for approximately $540 million. The sale is expected to close by the end of 2017, subject to certain regulatory and other approvals, and will include customary closing adjustments. The transaction is expected to result in an estimated gain of $130 million before tax ($100 million after tax) to be recognized upon closing.

Financial condition

We strive to maintain strong financial capacity and flexibility in all parts of the economic cycle. We rely on our operating cash flow to sustain our business, pay dividends and fund a portion of our growth. In addition, we access capital markets to meet our financing needs, manage our capital structure and to preserve our credit ratings.

We believe we have the financial capacity to fund our existing capital program through our predictable and growing cash flow from operations, access to capital markets (including through our At-The-Market (ATM) equity issuance program), our Dividend Reinvestment Plan (DRP), portfolio management including proceeds from potential drop downs of additional natural gas pipeline assets to TC PipeLines, LP, cash on hand and substantial committed credit facilities.

At September 30, 2017, our current assets were $5.8 billion and current liabilities were $11.4 billion, leaving us with a working capital deficit of $5.6 billion compared to a surplus of $0.4 billion at December 31, 2016. Our working capital deficiency is considered to be in the normal course of business and is managed through:


--  our ability to generate cash flow from operations
--  our access to capital markets
--  approximately $9.1 billion of unutilized, unsecured credit facilities.


CASH PROVIDED BY OPERATING ACTIVITIES

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                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, except
 per share amounts)                     2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Net cash provided by operations        1,185     1,265      3,840     3,494
Increase/(decrease) in operating
 working capital                          86        58        224       (28)
----------------------------------------------------------------------------
Funds generated from operations(1)     1,271     1,323      4,064     3,466
Specific items:
  Integration and acquisition
   related costs - Columbia               32        99         84       238
  Keystone XL asset costs                 10        14         23        37
  U.S. Northeast power disposition
   costs                                   3         5         20         5
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Comparable funds generated from
 operations(1)                         1,316     1,441      4,191     3,746
Dividends on preferred shares            (39)      (28)      (116)      (74)
Distributions paid to non-
 controlling interests                   (66)      (77)      (215)     (201)
Maintenance capital expenditures
 including equity investments           (442)     (342)      (988)     (858)
----------------------------------------------------------------------------
Comparable distributable cash
 flow(1)                                 769       994      2,872     2,613
----------------------------------------------------------------------------
Comparable distributable cash flow
 per common share(1)                   $0.88     $1.25      $3.30     $3.56
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) See the non-GAAP measures section in this MD&A for further discussion of
    funds generated from operations, comparable funds generated from
    operations, comparable distributable cash flow and comparable
    distributable cash flow per common share.

COMPARABLE FUNDS GENERATED FROM OPERATIONS

Comparable funds generated from operations, a non-GAAP measure, decreased $125 million for the three months ended September 30, 2017 compared to the same period in 2016 primarily due to lower comparable EBITDA (excluding income from equity investments) and increased funding of our U.S. employee post-retirement benefit plans, partially offset by higher distributions from our equity investments and interest income and other.

Comparable funds generated from operations increased $445 million for the nine months ended September 30, 2017 compared to the same period in 2016 primarily due to higher comparable EBITDA (excluding income from equity investments) and higher distributions from our equity investments, partially offset by higher interest expense and increased funding of our employee post-retirement benefit plans.

COMPARABLE DISTRIBUTABLE CASH FLOW

Comparable distributable cash flow, a non-GAAP measure, helps us assess the cash available to common shareholders before capital allocation. The decrease for the three months ended September 30, 2017 compared to the same period in 2016 was primarily driven by the decrease in comparable funds generated from operations and higher maintenance capital expenditures. The increase on a year-to-date basis is primarily due to the increase in comparable funds generated from operations, partially offset by higher maintenance capital expenditures. Comparable distributable cash flow per common share for the three and nine months ended September 30, 2017 also includes the dilutive effect of issuing 161 million common shares in 2016, of which 60 million were issued in fourth quarter 2016.

Although we deduct maintenance capital expenditures in determining comparable distributable cash flow, in certain of our rate-regulated businesses, maintenance capital expenditures are included in their respective rate bases on which we earn a regulated return and recover depreciation through future tolls.

The following provides a breakdown of maintenance capital expenditures:


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----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)              2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian Natural Gas Pipelines            181        96        300       190
U.S. Natural Gas Pipelines                217       189        512       404
Other                                      44        57        176       264
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Maintenance capital expenditures
 including equity investments             442       342        988       858
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CASH USED IN INVESTING ACTIVITIES

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----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Capital spending
Capital expenditures                  (2,031)   (1,444)    (5,383)   (3,262)
Capital projects in development          (37)      (62)      (135)     (219)
Contributions to equity investments     (475)     (286)    (1,140)     (570)
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                                      (2,543)   (1,792)    (6,658)   (4,051)
Restricted cash                            -    13,113          -         -
Acquisitions, net of cash acquired         -   (12,609)         -   (13,608)
Proceeds from sales of assets, net
 of transaction costs                      -         -      4,147         6
Other distributions from equity
 investments                               -         -        362       725
Deferred amounts and other               165       (14)       (87)       18
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Net cash used in investing
 activities                           (2,378)   (1,302)    (2,236)  (16,910)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Capital expenditures in 2017 were primarily related to:


--  expansion of Columbia Gas and Columbia Gulf pipelines
--  expansion of the NGTL System
--  construction of Mexico pipelines
--  expansion of the Canadian Mainline
--  capital additions to our ANR pipeline
--  construction of the Napanee power generating facility.

Costs incurred on Capital projects in development primarily related to spending on the Energy East and LNG-related pipeline projects.

Contributions to equity investments have increased in 2017 compared to 2016 primarily due to our investments in Sur de Texas, Bruce Power and Northern Border, partially offset by decreased contributions to Grand Rapids which is now in service. Contributions to equity investments also includes our proportionate share of Sur de Texas debt financing requirements.

Restricted cash in 2016 represented the amount held in escrow at June 30, 2016 for the purchase of Columbia on July 1, 2016.

In second quarter 2017, we closed the sale of our U.S. Northeast power generating assets for net proceeds of $4,147 million.

Other distributions from equity investments reflects Bruce Power financings undertaken to fund its capital program and make distributions to its partners. In second quarter 2016, Bruce Power issued senior notes in the capital markets and borrowed under a bank credit facility which resulted in $725 million being received by us. In first quarter 2017, Bruce Power issued additional senior notes in the capital markets which resulted in $362 million being received by us.



CASH PROVIDED BY/(USED IN) FINANCING ACTIVITIES

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----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Notes payable issued/(repaid), net       451      (423)     1,232      (100)
Long-term debt issued, net of issue
 costs                                 1,151         6      1,968    12,333
Long-term debt repaid                    (46)      (53)    (5,515)   (2,343)
Junior subordinated notes issued,
 net of issue costs                       (3)    1,551      3,468     1,551
Dividends and distributions paid        (459)     (502)    (1,313)   (1,434)
Common shares issued, net of issue
 costs                                     6       (37)        42     4,337
Common shares repurchased                  -         -          -       (14)
Preferred shares issued, net of
 issue costs                               -         -          -       492
Partnership units of TC PipeLines,
 LP issued, net of issue costs            43        45        162       151
Common units of Columbia Pipeline
 Partners LP acquired                      -         -     (1,205)        -
----------------------------------------------------------------------------
Net cash provided by/(used in)
 financing activities                  1,143       587     (1,161)   14,973
----------------------------------------------------------------------------
----------------------------------------------------------------------------

LONG-TERM DEBT ISSUED

The following table outlines significant debt issuances:


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----------------------------------------------------------------------------
(unaudited -
 millions of $)                                  Maturity           Interest
Company              Issue date     Type             date  Amount       rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TRANSCANADA PIPELINES LIMITED
                     September 2017 Medium Term     March
                                    Notes            2028     300      3.39%
                     September 2017 Medium Term September
                                    Notes            2047     700      4.33%
TUSCARORA GAS TRANSMISSION COMPANY
                     August 2017                   August
                                    Term Loan        2020   US 25   Floating
TC PIPELINES, LP
                     May 2017       Senior
                                    Unsecured
                                    Notes        May 2027  US 500      3.90%
----------------------------------------------------------------------------
----------------------------------------------------------------------------

LONG-TERM DEBT REPAID

The following table outlines significant debt repaid:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited -
 millions of $)     Retirement                                      Interest
Company             date           Type                    Amount       rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TUSCARORA GAS TRANSMISSION COMPANY
                    August 2017    Senior Secured
                                   Notes                   US 12       3.82%
TRANSCANADA PIPELINES LIMITED
                    June 2017      Acquisition Bridge
                                   Facility             US 1,513    Floating
                    February 2017  Acquisition Bridge
                                   Facility               US 500    Floating
                    January 2017   Medium Term Notes         300       5.10%
TRANSCANADA PIPELINE USA LTD.
                    June 2017      Acquisition Bridge
                                   Facility               US 630    Floating
                    April 2017     Acquisition Bridge
                                   Facility             US 1,070    Floating
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----------------------------------------------------------------------------

The acquisition bridge facilities were put into place to finance a portion of the Columbia acquisition. Proceeds from the sales of the U.S. Northeast power assets were used to fully retire the remaining acquisition bridge facilities in second quarter 2017.


JUNIOR SUBORDINATED NOTES ISSUED

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----------------------------------------------------------------------------
(unaudited -
 millions of $)                                  Maturity           Interest
Company             Issue date     Type              date  Amount       rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TRANSCANADA PIPELINES LIMITED
                    May 2017       Junior
                                   Subordinated
                                   Notes(1,2)    May 2077   1,500      4.90%
                    March 2017     Junior
                                   Subordinated     March      US
                                   Notes(1,2)        2077   1,500      5.55%
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(1) The Junior subordinated notes are subordinated in right of payment to
    existing and future senior indebtedness or other obligations of TCPL.
(2) The Junior subordinated notes were issued to TransCanada Trust (the
    Trust), a financing trust subsidiary wholly-owned by TCPL. While the
    obligations of the Trust are fully and unconditionally guaranteed by
    TCPL on a subordinated basis, the Trust is not consolidated in
    TransCanada's financial statements because TCPL does not have a variable
    interest in the Trust and the only substantive assets of the Trust are
    junior subordinated notes of TCPL.

In May 2017, the Trust issued $1.5 billion of Trust Notes - Series 2017-B (Trust Notes) to third party investors with a fixed interest rate of 4.65 per cent for the first ten years converting to a floating rate thereafter. All of the proceeds of the issuance by the Trust were loaned to TCPL for $1.5 billion of junior subordinated notes of TCPL at an initial fixed rate of 4.90 per cent, including a 0.25 per cent administration charge. The rate will reset commencing May 2027 until May 2047 to the then three month Bankers' Acceptance rate plus 3.33 per cent per annum; from May 2047 until May 2077, the interest rate will reset to the then three month Bankers' Acceptance rate plus 4.08 per cent per annum. The junior subordinated notes are callable at TCPL's option at any time on or after May 18, 2027 at 100 per cent of the principal amount plus accrued and unpaid interest to the date of redemption.

In March 2017, the Trust issued US$1.5 billion of Trust Notes - Series 2017-A (Trust Notes) to third party investors with a fixed interest rate of 5.30 per cent for the first ten years converting to a floating rate thereafter. All of the proceeds of the issuance by the Trust were loaned to TCPL for US$1.5 billion of junior subordinated notes of TCPL at an initial fixed rate of 5.55 per cent, including a 0.25 per cent administration charge. The rate will reset commencing March 2027 until March 2047 to the then three month LIBOR plus 3.458 per cent per annum; from March 2047 until March 2077, the interest rate will reset to the then three month LIBOR plus 4.208 per cent per annum. The junior subordinated notes are callable at TCPL's option at any time on or after March 15, 2027 at 100 per cent of the principal amount plus accrued and unpaid interest to the date of redemption.

Pursuant to the terms of the Trust Notes and related agreements, in certain circumstances (1) TCPL may issue deferral preferred shares to holders of the Trust Notes in lieu of interest; and (2) TransCanada and TCPL would be prohibited from declaring or paying dividends on or redeeming their outstanding preferred shares (or, if none are outstanding, their respective common shares) until all deferral preferred shares are redeemed by TCPL. The Trust Notes may also be automatically exchanged for preferred shares of TCPL upon certain kinds of bankruptcy and insolvency events. All of these preferred shares would rank equally with any other outstanding first preferred shares of TCPL.

DIVIDEND REINVESTMENT PLAN

Under our DRP, eligible holders of common and preferred shares of TransCanada can reinvest their dividends and make optional cash payments to obtain additional TransCanada common shares. Common shares are issued from treasury at a discount of two per cent to market prices over a specified period. For the dividends declared on July 28, 2017, approximately 35 per cent of common share dividends declared were designated to be reinvested by shareholders in TransCanada common shares under the DRP. Year-to-date in 2017, the participation rate amongst common shareholders has been approximately 36 per cent, resulting in $594 million of common equity issued.

TRANSCANADA CORPORATION ATM EQUITY ISSUANCE PROGRAM

In June 2017, we established an ATM program that allows us to issue common shares from treasury having an aggregate gross sales price of up to $1.0 billion or their U.S. dollar equivalent, from time to time, at our discretion, at the prevailing market price when sold through the Toronto Stock Exchange or the New York Stock Exchange. The ATM program, which is effective for a 25-month period, will be activated at our discretion, if and as required, based on the spend profile of TransCanada's capital program and relative cost of other funding options. At September 30, 2017, no common shares had been issued under the program.

TC PIPELINES, LP ATM EQUITY ISSUANCE PROGRAM

During the nine months ended September 30, 2017, 2.2 million common units were issued under the TC PipeLines, LP ATM program generating net proceeds of approximately US$124 million. At September 30, 2017, our ownership interest in TC PipeLines, LP was 26.0 per cent as a result of issuances under the ATM program and resulting dilution.

DIVIDENDS

On November 8, 2017, we declared quarterly dividends as follows:


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Quarterly dividend on our common shares
----------------------------------------------------------------------------
----------------------------------------------------------------------------
$0.625 per share
Payable on January 31, 2018 to shareholders of record at the close of
business on December 29, 2017
----------------------------------------------------------------------------
----------------------------------------------------------------------------

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Quarterly dividends on our preferred shares
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Series 1  $0.204125
Series 2  $0.16774247
Series 3  $0.1345
Series 4  $0.12741370
Payable on December 29, 2017 to shareholders of record at the close of
 business on November 30, 2017
Series 5  $0.14143750
Series 6  $0.16062192
Series 7  $0.25
Series 9  $0.265625
Payable on January 30, 2018 to shareholders of record at the close of
 business on January 2, 2018
Series 11 $0.2375
Series 13 $0.34375
Series 15 $0.30625
Payable on November 30, 2017 to shareholders of record at the close of
 business on November 21, 2017
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----------------------------------------------------------------------------

SHARE INFORMATION

----------------------------------------------------------------------------
----------------------------------------------------------------------------
as at November 3, 2017
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Common shares           Issued and outstanding
                                   878 million
----------------------------------------------------------------------------
Preferred shares        Issued and outstanding                Convertible to
Series 1                           9.5 million     Series 2 preferred shares
Series 2                          12.5 million     Series 1 preferred shares
Series 3                           8.5 million     Series 4 preferred shares
Series 4                           5.5 million     Series 3 preferred shares
Series 5                          12.7 million     Series 6 preferred shares
Series 6                           1.3 million     Series 5 preferred shares
Series 7                            24 million     Series 8 preferred shares
Series 9                            18 million    Series 10 preferred shares
Series 11                           10 million    Series 12 preferred shares
Series 13                           20 million    Series 14 preferred shares
Series 15                           40 million    Series 16 preferred shares

Options to buy common              Outstanding                   Exercisable
 shares
                                    11 million                     7 million
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CREDIT FACILITIES

We have several committed credit facilities that support our commercial paper programs and provide short-term liquidity for general corporate purposes. In addition, we have demand credit facilities that are also used for general corporate purposes, including issuing letters of credit and providing additional liquidity.

At November 8, 2017, we had a total of $11.0 billion of committed revolving and demand credit facilities, including:


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              Unused
Amount        capacity        Borrower     Description          Matures
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Committed, syndicated, revolving, extendible, senior unsecured credit
 facilities:
$3.0 billion  $3.0 billion    TCPL         Supports TCPL's      December
                                           Canadian dollar      2021
                                           commercial paper
                                           program and for
                                           general corporate
                                           purposes
US$2.0        US$2.0 billion  TCPL         Supports TCPL's U.S. December
 billion                                   dollar commercial    2017
                                           paper program and
                                           for general
                                           corporate purposes
US$1.0        US$1.0 billion  TCPL USA     Used for TCPL USA    December
 billion                                   general corporate    2017
                                           purposes, guaranteed
                                           by TCPL
US$1.0        US$0.4 billion  Columbia     Used for Columbia    December
 billion                                   general corporate    2017
                                           purposes, guaranteed
                                           by TCPL
US$0.5        US$0.5 billion  TAIL         Supports TAIL's U.S. December
 billion                                   dollar commercial    2017
                                           paper program,
                                           guaranteed by TCPL
                                           and for general
                                           corporate purposes
Demand senior unsecured revolving credit facilities:
$2.1 billion  $0.7 billion    TCPL/TCPL    Supports the         Demand
                              USA          issuance of letters
                                           of credit and
                                           provides additional
                                           liquidity
MXN$5.0       MXN$4.7 billion Mexican      Used for Mexico      Demand
 billion                      subsidiary   general corporate
                                           purposes, guaranteed
                                           by TCPL
----------------------------------------------------------------------------
----------------------------------------------------------------------------

At November 8, 2017, our operated affiliates had an additional $0.6 billion of undrawn capacity on committed credit facilities.

See Financial risks and financial instruments for more information about liquidity, market and other risks.

CONTRACTUAL OBLIGATIONS

Our capital commitments are consistent with those reported at December 31, 2016. Decreased commitments for the ongoing construction of the Sur de Texas natural gas pipeline and the Napanee power generating facility were mostly offset by increased commitments for the Columbia Gas and Columbia Gulf growth projects. Transportation by others commitments have increased by approximately $0.6 billion since December 31, 2016 primarily related to Canadian Mainline contracts. Other Energy commitments have decreased by approximately $0.4 billion since December 31, 2016 as a result of the sale of our U.S. Northeast power assets.

Our operating lease commitments at December 31, 2016 included future payments related to our U.S. Northeast power business. As a result of the completion of the sale of our thermal power assets in June 2017, the remaining future obligations reported at December 31, 2016 have decreased by: $2 million in 2017, $52 million in 2018, $34 million in 2019 and $102 million in 2022 and beyond.

There were no other material changes to our contractual obligations in third quarter 2017 or to payments due in the next five years or after. See the MD&A in our 2016 Annual Report for more information about our contractual obligations.

Financial risks and financial instruments

We are exposed to liquidity risk, counterparty credit risk and market risk, and have strategies, policies and limits in place to mitigate their impact on our earnings, cash flow and, ultimately, shareholder value. These are designed to ensure our risks and related exposures are in line with our business objectives and risk tolerance.

See our 2016 Annual Report for more information about the risks we face in our business. Our risks have not changed substantially since December 31, 2016, other than described below.

In second quarter 2017, we sold our U.S. Northeast merchant power generation assets and initiated the wind down of our U.S. power marketing operations. We expect to realize the value of the remaining marketing contracts and working capital over time. As a result, our exposure to commodity risk has been reduced.

LIQUIDITY RISK

We manage our liquidity risk by continuously forecasting our cash flow for a 12 month period to ensure we have adequate cash balances, cash flow from operations, committed and demand credit facilities and access to capital markets to meet our operating, financing and capital expenditure obligations under both normal and stressed economic conditions.

COUNTERPARTY CREDIT RISK

We have exposure to counterparty credit risk in the following areas:


--  accounts receivable
--  the fair value of derivative assets
--  cash and cash equivalents.

We review our accounts receivable regularly and record allowances for doubtful accounts using the specific identification method. At September 30, 2017, we had no significant credit losses, no significant credit risk concentration and no significant amounts past due or impaired.

We have significant credit and performance exposure to financial institutions because they hold cash deposits and provide committed credit lines and letters of credit that help manage our exposure to counterparties and provide liquidity in commodity, foreign exchange and interest rate derivative markets.

LOAN RECEIVABLE FROM AFFILIATE

We hold a 60 per cent equity interest in a joint venture with IEnova to build, own and operate the Sur de Texas pipeline. We account for the joint venture as an equity investment. On April 21, 2017, we entered into a MXN$13.6 billion unsecured revolving credit facility with the joint venture, which bears interest at a floating rate and matures in March 2022.

FOREIGN EXCHANGE AND INTEREST RATE RISK

We generate revenues and incur expenses that are denominated in currencies other than Canadian dollars. As a result, our earnings and cash flows are exposed to currency fluctuations.

A portion of our businesses generate earnings in U.S. dollars, but since we report our financial results in Canadian dollars, changes in the value of the U.S. dollar against the Canadian dollar can affect our net income. As our U.S. dollar-denominated operations continue to grow, this exposure increases. The majority of this risk is offset by interest expense on U.S. dollar-denominated debt and by using foreign exchange derivatives.

We have floating interest rate debt which subjects us to interest rate cash flow risk. We manage this using a combination of interest rate swaps and options.

Average exchange rate - U.S. to Canadian dollars

The average exchange rate for one U.S. dollar converted into Canadian dollars was as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
three months ended September 30, 2017                                   1.25
three months ended September 30, 2016                                   1.31
----------------------------------------------------------------------------

----------------------------------------------------------------------------
nine months ended September 30, 2017                                    1.31
nine months ended September 30, 2016                                    1.32
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The impact of changes in the value of the U.S. dollar on our U.S. operations is significantly offset by interest on U.S. dollar-denominated long-term debt, as set out in the table below. Comparable EBIT is a non-GAAP measure. See our Reconciliation of non-GAAP measures section for more information.


Significant U.S. dollar-denominated amounts

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of US$)           2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
U.S. Natural Gas Pipelines
 comparable EBIT                         269       290        998       635
Mexico Natural Gas Pipelines
 comparable EBIT                          76        73        254       141
U.S. Liquids Pipelines comparable
 EBIT                                    135       117        416       360
U.S. Power comparable EBIT                22       130        108       223
AFUDC on U.S. dollar-denominated
 projects                                 81        55        168       149
Interest on U.S. dollar-denominated
 long-term debt                         (314)     (315)      (954)     (811)
Capitalized interest on U.S.
 dollar-denominated capital
 expenditures                              1         6          2        22
U.S. dollar non-controlling
 interests and other                     (35)      (38)      (144)     (138)
----------------------------------------------------------------------------
                                         235       318        848       581
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Net investment hedge

We hedge our net investment in foreign operations (on an after-tax basis) with U.S. dollar-denominated debt, cross-currency interest rate swaps, foreign exchange forward contracts and foreign exchange options.

The fair values and notional or principal amounts for the derivatives designated as a net investment hedge were as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                  September 30, 2017     December 31, 2016
                                --------------------------------------------
(unaudited - millions of                   Notional or           Notional or
 Canadian $, unless noted            Fair    principal     Fair    principal
 otherwise)                      value(1)       amount value(1)       amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
U.S. dollar cross-currency
 interest rate swaps (maturing
 2017 to 2019)(2)                    (222)    US 1,400     (425)    US 2,350
U.S. dollar foreign exchange
 forward contracts                      -            -       (7)      US 150
----------------------------------------------------------------------------
                                     (222)    US 1,400     (432)    US 2,500
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Fair values equal carrying values.
(2) In the three and nine months ended September 30, 2017, condensed
    consolidated net income includes net realized gains of $1 million and $3
    million, respectively, (2016 - gains of $1 million and $5 million,
    respectively) related to the interest component of cross-currency swap
    settlements which are reported within interest expense.

The notional amounts and fair value of U.S. dollar-denominated debt designated as a net investment hedge were as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited - millions of Canadian $,
 unless noted otherwise)              September 30, 2017   December 31, 2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Notional amount                       24,900 (US 19,900)  26,600 (US 19,800)
Fair value                            28,300 (US 22,600)  29,400 (US 21,900)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

FINANCIAL INSTRUMENTS

All financial instruments, including both derivative and non-derivative instruments, are recorded on the balance sheet at fair value unless they were entered into and continue to be held for the purpose of receipt or delivery in accordance with our normal purchase and sales exemptions and are documented as such. In addition, fair value accounting is not required for other financial instruments that qualify for certain accounting exemptions.

Derivative instruments

We use derivative instruments to reduce volatility associated with fluctuations in commodity prices, interest rates and foreign exchange rates. We apply hedge accounting to derivative instruments that qualify and are designated for hedge accounting treatment.

The majority of derivative instruments that are not designated or do not qualify for hedge accounting treatment have been entered into as economic hedges to manage our exposure to market risk (held for trading). Changes in the fair value of held for trading derivative instruments are recorded in net income in the period of change. This may expose us to increased variability in reported operating results since the fair value of the held for trading derivative instruments can fluctuate significantly from period to period.

Balance sheet presentation of derivative instruments

The balance sheet classification of the fair value of derivative instruments is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited - millions of $)          September 30, 2017   December 31, 2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Other current assets                                286                 376
Intangible and other assets                          89                 133
Accounts payable and other                         (453)               (607)
Other long-term liabilities                        (155)               (330)
----------------------------------------------------------------------------
                                                   (233)               (428)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Unrealized and realized gains/(losses) of derivative instruments

The following summary does not include hedges of our net investment in foreign operations.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, pre-
 tax)                                   2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Derivative instruments held for
 trading(1)
Amount of unrealized gains/(losses)
 in the period
  Commodities(2)                          45       (97)      (102)       23
  Foreign exchange                        33         -         89        47
  Interest rate                           (1)        -         (1)        -
Amount of realized (losses)/gains
 in the period
  Commodities                            (82)      (23)      (167)     (165)
  Foreign exchange                        19        (5)        10        52
  Interest rate                            1         -          1         -
Derivative instruments in hedging
 relationships
Amount of realized gains/(losses)
 in the period
  Commodities                              4       (15)        17      (155)
  Foreign exchange                         -         5          5      (101)
  Interest rate                            -         1          1         4
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Realized and unrealized gains and losses on held for trading derivative
    instruments used to purchase and sell commodities are included net in
    revenues. Realized and unrealized gains and losses on interest rate and
    foreign exchange held for trading derivative instruments are included
    net in interest expense and interest income and other, respectively.
(2) In the three and nine months ended September 30, 2017, there were no
    gains or losses included in net income relating to discontinued cash
    flow hedges where it was probable that the anticipated transaction would
    not occur (2016 - nil and a net loss of $42 million, respectively).

Derivatives in cash flow hedging relationships

The components of the condensed consolidated statement of OCI related to derivatives in cash flow hedging relationships including the portion attributable to non-controlling interests is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $, pre-
 tax)                                   2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Change in fair value of derivative
 instruments recognized in OCI
 (effective portion)(1)
  Commodities                              2         7          5        33
  Foreign exchange                         -        (5)         -         -
  Interest rate                           (1)        4          -         -
----------------------------------------------------------------------------
                                           1         6          5        33
----------------------------------------------------------------------------
Reclassification of (losses)/gains
 on derivative instruments from
 AOCI to net income (effective
 portion)(1)
  Commodities(2)                          (4)       (7)       (15)       54
  Foreign exchange(3)                      -         5          -         -
  Interest rate(4 )                        4         3         13        11
----------------------------------------------------------------------------
                                           -         1         (2)       65
----------------------------------------------------------------------------
Gains/(losses) on derivative
 instruments recognized in net
 income (ineffective portion)
  Commodities(2)                           -        14          -        (1)
----------------------------------------------------------------------------
                                           -        14          -        (1)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) No amounts have been excluded from the assessment of hedge
    effectiveness. Amounts in parentheses indicate losses recorded to OCI
    and AOCI.
(2) Reported within revenues on the condensed consolidated statement of
    income.
(3) Reported within interest income and other on the condensed consolidated
    statement of income.
(4) Reported within interest expense on the condensed consolidated statement
    of income.

Credit risk related contingent features of derivative instruments

Derivatives often contain financial assurance provisions that may require us to provide collateral if a credit risk related contingent event occurs (for example, if our credit rating is downgraded to non-investment grade). We may also need to provide collateral if the fair value of our derivative financial instruments exceeds pre-defined exposure limits.

Based on contracts in place and market prices at September 30, 2017, the aggregate fair value of all derivative contracts with credit-risk-related contingent features that were in a net liability position was $11 million (December 31, 2016 - $19 million), with collateral provided in the normal course of business of nil (December 31, 2016 - nil). If the credit-risk-related contingent features in these agreements were triggered on September 30, 2017, we would have been required to provide additional collateral of $11 million (December 31, 2016 - $19 million) to our counterparties. Collateral may also need to be provided should the fair value of derivative instruments exceed pre-defined contractual exposure limit thresholds.

We have sufficient liquidity in the form of cash and undrawn committed revolving bank lines to meet these contingent obligations should they arise.

Other information

CONTROLS AND PROCEDURES

Management, including our President and CEO and our CFO, evaluated the effectiveness of our disclosure controls and procedures as at September 30, 2017, as required by the Canadian securities regulatory authorities and by the SEC, and concluded that our disclosure controls and procedures are effective at a reasonable assurance level.

Effective April 1, 2017, management successfully integrated Columbia, which we acquired on July 1, 2016, to our existing enterprise resource planning (ERP) system. As a result of the Columbia ERP system integration, certain processes supporting our internal control over financial reporting for Columbia operations changed in second quarter 2017, however, the overall controls and procedures we follow in establishing internal controls over financial reporting were not significantly impacted.

Assets attributable to Columbia represented approximately 18.1 per cent of our total assets as of September 30, 2017 and revenues attributable to Columbia for the nine months ended September 30, 2017 represented approximately 14.6 per cent of our total revenues for that period.

There were no changes in third quarter 2017 that had or are likely to have a material impact on our internal control over financial reporting.

CRITICAL ACCOUNTING ESTIMATES AND ACCOUNTING POLICY CHANGES

When we prepare financial statements that conform with U.S. GAAP, we are required to make estimates and assumptions that affect the timing and amounts we record for our assets, liabilities, revenues and expenses because these items may be affected by future events. We base the estimates and assumptions on the most current information available, using our best judgement. We also regularly assess the assets and liabilities themselves. A summary of our critical accounting estimates is included in our 2016 Annual Report.

Our significant accounting policies have remained unchanged since December 31, 2016 other than described below. A summary of our significant accounting policies is included in our 2016 Annual Report.

Changes in accounting policies for 2017

Inventory

In July 2015, the FASB issued new guidance on simplifying the measurement of inventory. The new guidance specifies that an entity should measure inventory within the scope of this guidance at the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. This new guidance was effective January 1, 2017, was applied prospectively and did not have a material impact on our consolidated balance sheet.

Derivatives and hedging

In March 2016, the FASB issued new guidance that clarifies the requirements for assessing whether contingent call or put options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The new guidance requires only an assessment of the four-step decision sequence outlined in U.S. GAAP to determine whether the economic characteristics and risks of call or put options are clearly and closely related to the economic characteristics and risks of their debt hosts. This new guidance was effective January 1, 2017, was applied prospectively and has not resulted in any impact on our consolidated financial statements.

Equity method investments

In March 2016, the FASB issued new guidance that simplifies the transition to equity method accounting. The new guidance eliminates the requirement to retroactively apply the equity method of accounting when an increase in ownership interest in an investment qualifies it for equity method accounting. This new guidance was effective January 1, 2017, was applied prospectively and has not resulted in any impact on our consolidated financial statements.

Employee share-based payments

In March 2016, the FASB issued new guidance that simplifies several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The new guidance also permits entities to make an accounting policy election either to continue to estimate the total number of awards for which the requisite service period will not be rendered or to account for forfeitures when they occur. We have elected to account for forfeitures when they occur. This new guidance was effective January 1, 2017 and resulted in a cumulative-effect adjustment of $12 million to opening retained earnings and the recognition of a deferred tax asset related to employee share-based payments that were made prior to the adoption of this guidance.

Consolidation

In October 2016, the FASB issued new guidance on consolidation relating to interests held through related parties that are under common control. The new guidance amends the consolidation requirements such that if a decision maker is required to evaluate whether it is the primary beneficiary of a VIE, it will need to consider only its proportionate indirect interest in the VIE held through a common control party. The new guidance was effective January 1, 2017, was applied retrospectively and did not result in any change to our consolidation conclusions.

Future accounting changes

Revenue from contracts with customers

In 2014, the FASB issued new guidance on revenue from contracts with customers. The new guidance requires that an entity recognize revenue in accordance with a prescribed model. This model is used to depict the transfer of promised goods or services to customers in an amount that reflects the total consideration to which it expects to be entitled during the term of the contract in exchange for those goods or services. The new guidance also requires additional disclosures about the nature, amount, timing and uncertainty of revenue and the related cash flows. We will adopt the new standard on the effective date of January 1, 2018. There are two methods in which the new standard can be adopted: (1) a full retrospective approach with restatement of all prior periods presented, or (2) a modified retrospective approach with a cumulative-effect adjustment as of the date of adoption. We will adopt the standard using the modified retrospective approach with the cumulative-effect of the adjustment recognized at the date of adoption, subject to allowable and elected practical expedients.

We have identified all existing customer contracts that are within the scope of the new guidance and are on schedule in the process of analyzing individual contracts or groups of contracts by operating segment to identify any significant changes in how revenues are recognized as a result of implementing the new guidance. We have completed our analysis of the Liquids Pipelines and Energy operating segments and have not identified any material differences in the amount and timing of revenue recognition. We are currently analyzing our Canadian, U.S. and Mexico Natural Gas Pipelines and have not yet concluded on the impact of the new guidance on these operating segments. As we continue our contract analysis, we will obtain the information necessary to quantify the cumulative-effect adjustment, if any, on prior period revenues and revenue recognized going forward, and we are monitoring additional authoritative or interpretive guidance related to the new standard as it becomes available.

Although consolidated revenues may not be materially impacted by the new guidance, we currently anticipate significant changes to disclosures based on the additional requirements prescribed. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is recognized and information related to contract assets and liabilities. In addition, the new guidance requires that our revenue recognition policy disclosure includes additional detail regarding the various performance obligations and the nature, amount, timing and estimates of revenue and cash flows generated from contracts with customers. We continue to develop and evaluate disclosures required with a particular focus on the scope of contracts subject to disclosure of remaining performance obligations and continue to address any system and process changes necessary to compile the information to meet the recognition and disclosure requirements of the new guidance.

Financial instruments

In January 2016, the FASB issued new guidance on the accounting for equity investments and financial liabilities. The new guidance will change the income statement effect of equity investments and the recognition of changes in the fair value of financial liabilities when the fair value option is elected. The new guidance also requires us to assess valuation allowances for deferred tax assets related to available for sale debt securities in combination with their other deferred tax assets. This new guidance is effective January 1, 2018 and a method of adoption is specified for each component of the guidance. We are currently evaluating the impact of the adoption of this guidance and have not yet determined the effect on our consolidated financial statements.

Leases

In February 2016, the FASB issued new guidance on the accounting for leases. The new guidance amends the definition of a lease requiring the customer to have both (1) the right to obtain substantially all of the economic benefits from the use of the asset and (2) the right to direct the use of the asset in order for an arrangement to qualify as a lease. The new guidance also establishes a right-of-use (ROU) model that requires a lessee to recognize a ROU asset and corresponding lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new guidance does not make extensive changes to lessor accounting.

The new guidance is effective on January 1, 2019, with early adoption permitted. A modified retrospective transition approach is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. We are continuing to identify and analyze existing lease agreements to determine the effect of adoption of the new guidance on our consolidated financial statements. We are also addressing system and process changes necessary to compile the information to meet the recognition and disclosure requirements of the new guidance.

Measurement of credit losses on financial instruments

In June 2016, the FASB issued new guidance that significantly changes how entities measure credit losses for most financial assets and certain other financial instruments that are not measured at fair value through net income. The new guidance amends the impairment model of financial instruments basing it on expected losses rather than incurred losses. These expected credit losses will be recognized as an allowance rather than a direct write down of the amortized cost basis. The new guidance is effective January 1, 2020 and will be applied using a modified retrospective approach. We are currently evaluating the impact of the adoption of this guidance and have not yet determined the effect on our consolidated financial statements.

Income taxes

In October 2016, the FASB issued new guidance on the income tax effects of intra-entity transfers of assets other than inventory. The new guidance requires the recognition of deferred and current income taxes for an intra-entity asset transfer when the transfer occurs. The new guidance is effective January 1, 2018 and will be applied using a modified retrospective approach. We are currently evaluating the impact of the adoption of this guidance and have not yet determined the effect on our consolidated financial statements.

Restricted cash

In November 2016, the FASB issued new guidance on restricted cash and cash equivalents on the statement of cash flows. The new guidance requires that the statement of cash flows explain the change during the period in the total cash and cash equivalents balance, and amounts generally described as restricted cash or restricted cash equivalents. Restricted cash and cash equivalents will be included with Cash and cash equivalents when reconciling the beginning of year and end of year total amounts on the statement of cash flows. This new guidance is effective January 1, 2018 and will be applied retrospectively.

Goodwill impairment

In January 2017, the FASB issued new guidance on simplifying the test for goodwill impairment by eliminating Step 2 of the impairment test, which is the requirement to calculate the implied fair value of goodwill to measure the impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. This new guidance is effective January 1, 2020 and will be applied prospectively, however, early adoption is permitted.

Employee post-retirement benefits

In March 2017, the FASB issued new guidance that will require entities to disaggregate the current service cost component from the other components of net benefit cost and present it with other current compensation costs for related employees in the income statement. The new guidance also requires that the other components of net benefit cost be presented elsewhere in the income statement and excluded from income from operations if such a subtotal is presented. In addition, the new guidance makes changes to the components of net benefit cost that are eligible for capitalization. Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of the components of net benefit cost, and a prospective transition method to adopt the change to capitalization of benefit costs. This new guidance is effective January 1, 2018. We do not expect a material impact on our consolidated financial statements.

Amortization on purchased callable debt securities

In March 2017, the FASB issued new guidance that shortens the amortization period for the premium on certain purchased callable debt securities by requiring entities to amortize the premium to the earliest call date. This new guidance is effective January 1, 2019 and will be applied using a modified retrospective approach. We are currently evaluating the impact of the adoption of this guidance and have not yet determined the effect on our consolidated financial statements.

Hedge accounting

In August 2017, the FASB issued new guidance on hedge accounting, making more financial and non-financial hedging strategies eligible for hedge accounting. The new guidance also amends the presentation requirements relating to the change in fair value of a derivative and additional disclosure requirements include cumulative basis adjustments for fair value hedges and the effect of hedging on individual statement of income line items. This new guidance is effective January 1, 2019, with early adoption permitted, and will be applied prospectively with a cumulative-effect adjustment to opening retained earnings on adoption. We are currently evaluating the impact of the adoption of this guidance, however we do not anticipate a material impact on our consolidated financial statements.


Reconciliation of non-GAAP measures

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    three months ended    nine months ended
                                       September 30         September 30
                                   -------------------- --------------------
(unaudited - millions of $)             2017      2016       2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Comparable EBITDA
Canadian Natural Gas Pipelines           544       549      1,575     1,598
U.S. Natural Gas Pipelines               482       522      1,753     1,112
Mexico Natural Gas Pipelines             118       111        403       213
Liquids Pipelines                        303       278        947       850
Energy                                   224       418        816       977
Corporate                                 (4)        8        (20)        7
----------------------------------------------------------------------------
Comparable EBITDA                      1,667     1,886      5,474     4,757
Depreciation and amortization           (506)     (527)    (1,532)   (1,425)
----------------------------------------------------------------------------
Comparable EBIT                        1,161     1,359      3,942     3,332
Specific items:
  Net (loss)/gain on sales of U.S.
   Northeast power assets                (12)       (5)       469        (5)
  Integration and acquisition
   related costs - Columbia              (32)      (96)       (91)     (132)
  Keystone XL asset costs                (10)      (14)       (23)      (37)
  Foreign exchange gain/(loss) -
   inter-affiliate loan                    7         -         (1)        -
  Ravenswood goodwill impairment           -    (1,085)         -    (1,085)
  Alberta PPA terminations                 -         -          -      (240)
  Restructuring costs                      -         -          -       (14)
  TC Offshore loss on sale                 -         -          -        (4)
  Risk management activities(1)           45       (81)      (102)       22
----------------------------------------------------------------------------
Segmented earnings                     1,159        78      4,194     1,837
----------------------------------------------------------------------------
----------------------------------------------------------------------------

      ----------------------------------------------------------------------
      ----------------------------------------------------------------------
(1)                                 three months ended    nine months ended
      Risk management activities       September 30         September 30
                                   -------------------- --------------------
      (unaudited - millions of $)       2017      2016       2017      2016
      ----------------------------------------------------------------------
      ----------------------------------------------------------------------
      Canadian Power                       1        (4)         5         3
      U.S. Power                          59       (73)       (97)       16
      Natural Gas Storage                  4         4          5         9
      Liquids marketing                  (19)       (8)       (15)       (6)
      ----------------------------------------------------------------------
      Total unrealized
       (losses)/gains from risk
       management activities              45       (81)      (102)       22
      ----------------------------------------------------------------------
      ----------------------------------------------------------------------

Quarterly results


SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                           2017                     2016               2015
                  --------------------- ---------------------------- -------
(unaudited -
 millions of $,
 except per share
 amounts)           Third Second  First Fourth  Third  Second  First Fourth
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues            3,242  3,217  3,391  3,619  3,632   2,751  2,503  2,851
Net income/(loss)
 attributable to
 common shares        612    881    643   (358)  (135)    365    252 (2,458)
Comparable
 earnings             614    659    698    626    622     366    494    453
Per share
 statistics
  Net
   income/(loss)
   per common
   share - basic
   and diluted      $0.70  $1.01  $0.74 ($0.43)($0.17)  $0.52  $0.36 ($3.47)
  Comparable
   earnings per
   common share     $0.70  $0.76  $0.81  $0.75  $0.78   $0.52  $0.70  $0.64
  Dividends
   declared per
   common share    $0.625 $0.625 $0.625 $0.565 $0.565  $0.565 $0.565  $0.52
----------------------------------------------------------------------------
----------------------------------------------------------------------------

FACTORS AFFECTING QUARTERLY FINANCIAL INFORMATION BY BUSINESS SEGMENT

Quarter-over-quarter revenues and net income sometimes fluctuate, the causes of which vary across our business segments.

In our Canadian Natural Gas Pipelines, U.S. Natural Gas Pipelines and Mexico Natural Gas Pipelines segments, except for seasonal fluctuations in short-term throughput volumes on U.S. pipelines, quarter-over-quarter revenues and net income generally remain relatively stable during any fiscal year. Over the long term, however, they fluctuate because of:


--  regulatory decisions
--  negotiated settlements with shippers
--  acquisitions and divestitures
--  developments outside of the normal course of operations
--  newly constructed assets being placed in service.

In Liquids Pipelines, revenues and net income are generally based on contracted crude oil transportation and uncommitted spot transportation. Quarter-over-quarter revenues and net income are also affected by:


--  developments outside of the normal course of operations
--  newly constructed assets being placed in service
--  regulatory decisions
--  short term revenues from available capacity not committed under long
    term contract, driven by changing short term market conditions.

In Energy, quarter-over-quarter revenues and net income are affected by:


--  weather
--  customer demand
--  market prices for natural gas and power
--  capacity prices and payments
--  planned and unplanned plant outages
--  acquisitions and divestitures
--  certain fair value adjustments
--  developments outside of the normal course of operations
--  newly constructed assets being placed in service.

FACTORS AFFECTING FINANCIAL INFORMATION BY QUARTER

We calculate comparable measures by adjusting certain GAAP and non-GAAP measures for specific items we believe are significant but not reflective of our underlying operations in the period.

Comparable earnings exclude the unrealized gains and losses from changes in the fair value of certain derivatives used to reduce our exposure to certain financial and commodity price risks. These derivatives generally provide effective economic hedges, but do not meet the criteria for hedge accounting. As a result, the changes in fair value are recorded in net income. As these amounts do not accurately reflect the gains and losses that will be realized at settlement, we do not consider them reflective of our underlying operations.

In third quarter 2017, comparable earnings excluded:


--  an after-tax charge of $30 million for integration-related costs
    associated with the acquisition of Columbia
--  an after-tax charge of $12 million for post-closing and income tax
    adjustments related to the monetization of our U.S. Northeast power
    business
--  an after-tax charge of $8 million related to the maintenance of Keystone
    XL assets which is being expensed pending further advancement of the
    project.

In second quarter 2017, comparable earnings excluded:


--  a $265 million net after-tax gain related to the monetization of our
    U.S. Northeast power business which included a $441 million after-tax
    gain on the sale of TC Hydro and a loss of $176 million after tax on the
    sale of the thermal and wind package
--  an after-tax charge of $15 million for integration-related costs
    associated with the acquisition of Columbia
--  an after-tax charge of $4 million related to the maintenance of Keystone
    XL assets which are being expensed pending further advancement of the
    project.

In first quarter 2017, comparable earnings excluded:


--  a charge of $24 million after tax for integration-related costs
    associated with the acquisition of Columbia
--  a charge of $10 million after tax for costs related to the monetization
    of our U.S. Northeast power business
--  a charge of $7 million after tax related to the maintenance of Keystone
    XL assets which are being expensed pending further advancement of the
    project
--  a $7 million income tax recovery related to the realized loss on a third
    party sale of Keystone XL project assets. A provision for the expected
    pre-tax loss on these assets was included in our 2015 impairment charge,
    but the related income tax recoveries could not be recorded until
    realized.

In fourth quarter 2016, comparable earnings excluded:


--  an $870 million after-tax charge related to the loss on U.S. Northeast
    power assets held for sale which included an $863 million after-tax loss
    on the thermal and wind package held for sale and $7 million of after-
    tax costs related to their monetization
--  an additional $68 million after-tax loss on the transfer of
    environmental credits to the Balancing Pool upon final settlement of the
    Alberta PPA terminations
--  an after-tax charge of $67 million for costs associated with the
    acquisition of Columbia which included a $44 million deferred tax
    adjustment upon acquisition and $23 million of retention, severance and
    integration costs
--  an after-tax charge of $18 million related to Keystone XL costs for the
    maintenance and liquidation of project assets which are being expensed
    pending further advancement of the project
--  an after-tax restructuring charge of $6 million for additional expected
    future losses under lease commitments. These charges formed part of a
    restructuring initiative, which commenced in 2015, to maximize the
    effectiveness and efficiency of our existing operations and reduce
    overall costs.

In third quarter 2016, comparable earnings excluded:


--  a $656 million after-tax impairment on Ravenswood goodwill. As a result
    of information received during the process to monetize our U.S.
    Northeast Power business in third quarter 2016, it was determined that
    the fair value of Ravenswood no longer exceeded its carrying value
--  costs associated with the acquisition of Columbia including a charge of
    $67 million after tax primarily related to retention, severance and
    integration expenses
--  $28 million of income tax recoveries related to the realized loss on a
    third party sale of Keystone XL plant and equipment. A provision for the
    expected loss on these assets was included in our fourth quarter 2015
    impairment charge but the related tax recoveries could not be recorded
    until realized
--  a charge of $9 million after tax related to Keystone XL costs for the
    maintenance and liquidation of project assets which are being expensed
    pending further advancement of the project
--  a $3 million after-tax charge related to the monetization of our U.S.
    Northeast Power business.

In second quarter 2016, comparable earnings excluded:


--  a charge of $113 million related to costs associated with the
    acquisition of Columbia
--  a charge of $9 million after tax related to Keystone XL costs for the
    maintenance and liquidation of project assets which are being expensed
    pending further advancement of the project
--  a charge of $10 million after tax for restructuring charges mainly
    related to expected future losses under lease commitments.

In first quarter 2016, comparable earnings excluded:


--  a $176 million after-tax impairment charge on the carrying value of our
    Alberta PPAs as a result of our decision to terminate the PPAs
--  a charge of $26 million related to costs associated with the acquisition
    of Columbia
--  a charge of $6 million after tax related to Keystone XL costs for the
    maintenance and liquidation of project assets which are being expensed
    pending further advancement of the project
--  an additional $3 million after-tax loss on the sale of TC Offshore which
    closed on March 31, 2016.

In fourth quarter 2015, comparable earnings excluded:


--  a $2,891 million after-tax impairment charge on the carrying value of
    our investment in Keystone XL and related projects
--  an $86 million after-tax loss provision related to the sale of TC
    Offshore which closed in early 2016
--  a net charge of $60 million after tax for our business restructuring and
    transformation initiative comprised of $28 million mainly related to
    2015 severance costs and a provision of $32 million for 2016 planned
    severance costs and expected future losses under lease commitments.
    These charges formed part of a restructuring initiative which commenced
    in 2015 to maximize the effectiveness and efficiency of our existing
    operations and reduce overall costs
--  a $43 million after-tax charge related to an impairment in value of
    turbine equipment held for future use in our Energy business
--  a charge of $27 million after tax related to Bruce Power's retirement of
    debt in conjunction with the merger of the Bruce A and Bruce B
    partnerships
--  a $199 million positive income adjustment related to the impact on our
    net income from non-controlling interests of TC PipeLines, LP's
    impairment of their equity investment in Great Lakes.


                 Condensed consolidated statement of income

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                       three months ended  nine months ended
                                          September 30       September 30
                                       ------------------ ------------------
(unaudited - millions of Canadian $,
 except per share amounts)                 2017     2016      2017     2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues
Canadian Natural Gas Pipelines              921      951     2,725    2,677
U.S. Natural Gas Pipelines                  811      812     2,684    1,585
Mexico Natural Gas Pipelines                139      121       432      249
Liquids Pipelines                           437      440     1,410    1,292
Energy                                      934    1,308     2,599    3,083
----------------------------------------------------------------------------
                                          3,242    3,632     9,850    8,886
Income from Equity Investments              156      154       527      355
Operating and Other Expenses
Plant operating costs and other             976    1,177     2,980    2,646
Commodity purchases resold                  621      783     1,711    1,628
Property taxes                              127      136       442      405
Depreciation and amortization               506      527     1,539    1,425
Goodwill and other asset impairment
 charges                                      -    1,085         -    1,296
----------------------------------------------------------------------------
                                          2,230    3,708     6,672    7,400
(Loss)/Gain on Sale of Assets                (9)       -       489       (4)
Financial Charges
Interest expense                            504      522     1,528    1,456
Allowance for funds used during
 construction                              (145)    (110)     (367)    (322)
Interest income and other                   (84)     (12)     (193)    (118)
----------------------------------------------------------------------------
                                            275      400       968    1,016
----------------------------------------------------------------------------
Income/(Loss) before Income Taxes           884     (322)    3,226      821
----------------------------------------------------------------------------
Income Tax Expense/(Recovery)
Current                                       6       14       128      103
Deferred                                    182     (280)      653      (25)
----------------------------------------------------------------------------
                                            188     (266)      781       78
----------------------------------------------------------------------------
Net Income/(Loss)                           696      (56)    2,445      743
Net income attributable to non-
 controlling interests                       44       52       189      184
----------------------------------------------------------------------------
Net Income/(Loss)Attributable to
 Controlling Interests                      652     (108)    2,256      559
Preferred share dividends                    40       27       120       77
----------------------------------------------------------------------------
Net Income/(Loss) Attributable to
 Common Shares                              612     (135)    2,136      482
----------------------------------------------------------------------------

Net Income/(Loss) per Common Share
Basic                                     $0.70   ($0.17)    $2.46    $0.66
Diluted                                   $0.70   ($0.17)    $2.45    $0.66
----------------------------------------------------------------------------
Dividends Declared per Common Share      $0.625   $0.565    $1.875   $1.695
----------------------------------------------------------------------------

Weighted Average Number of Common
 Shares (millions)
Basic                                       873      797       870      734
Diluted                                     875      798       872      735
----------------------------------------------------------------------------
----------------------------------------------------------------------------
See accompanying notes to the condensed consolidated financial statements.

          Condensed consolidated statement of comprehensive income

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                       three months ended  nine months ended
                                          September 30       September 30
                                       ------------------ ------------------
(unaudited - millions of Canadian $)        2017     2016      2017     2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Net Income/(Loss)                           696      (56)    2,445      743
----------------------------------------------------------------------------
Other Comprehensive (Loss)/Income, Net
 of Income Taxes
Foreign currency translation
 (losses)/gains on net investment in
 foreign operations                        (370)      55      (721)    (152)
Reclassification of foreign currency
 translation gains on net investment in
 foreign operations                           -        -       (77)       -
Change in fair value of net investment
 hedges                                      (1)      (1)       (3)      (9)
Change in fair value of cash flow
 hedges                                       1        5         4       21
Reclassification to net income of gains
 and losses on cash flow hedges               -        -        (1)      40
Unrealized actuarial gains and losses
 on pension and other post-retirement
 benefit plans                                2        -         2        -
Reclassification of actuarial gains and
 losses on pension and other post-
 retirement benefit plans                     4        4        11       12
Other comprehensive income on equity
 investments                                  3        4         6       11
----------------------------------------------------------------------------
Other comprehensive (loss)/income (Note
 9)                                        (361)      67      (779)     (77)
----------------------------------------------------------------------------
Comprehensive Income                        335       11     1,666      666
Comprehensive (loss)/income
 attributable to non-controlling
 interests                                  (25)      76        31      104
----------------------------------------------------------------------------
Comprehensive Income/(Loss)
 Attributable to Controlling Interests      360      (65)    1,635      562
Preferred share dividends                    40       27       120       77
----------------------------------------------------------------------------
Comprehensive Income/(Loss)
 Attributable to Common Shares              320      (92)    1,515      485
----------------------------------------------------------------------------
----------------------------------------------------------------------------
See accompanying notes to the condensed consolidated financial statements.



               Condensed consolidated statement of cash flows

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                       three months ended  nine months ended
                                          September 30       September 30
                                       ------------------ ------------------
(unaudited - millions of Canadian $)       2017     2016      2017     2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Cash Generated from Operations
Net income/(loss)                           696      (56)    2,445      743
Depreciation and amortization               506      527     1,539    1,425
Goodwill and other asset impairment
 charges                                      -    1,085         -    1,296
Deferred income taxes                       182     (280)      653      (25)
Income from equity investments             (156)    (154)     (527)    (355)
Distributions received from operating
 activities of equity investments           296      185       743      625
Employee post-retirement benefits
 funding, net of expense                    (73)       4       (64)      (5)
Loss/(gain) on sale of assets                 9        -      (489)       4
Equity allowance for funds used during
 construction                              (107)     (71)     (249)    (195)
Unrealized (gains)/losses on financial
 instruments                                (77)      82        14      (71)
Other                                        (5)       1        (1)      24
(Increase)/decrease in operating
 working capital                            (86)     (58)     (224)      28
----------------------------------------------------------------------------
Net cash provided by operations           1,185    1,265     3,840    3,494
----------------------------------------------------------------------------
Investing Activities
Capital expenditures                     (2,031)  (1,444)   (5,383)  (3,262)
Capital projects in development             (37)     (62)     (135)    (219)
Contributions to equity investments        (475)    (286)   (1,140)    (570)
Restricted cash                               -   13,113         -        -
Acquisitions, net of cash acquired            -  (12,609)        -  (13,608)
Proceeds from sales of assets, net of
 transaction costs                            -        -     4,147        6
Other distributions from equity
 investments                                  -        -       362      725
Deferred amounts and other                  165      (14)      (87)      18
----------------------------------------------------------------------------
Net cash used in investing activities    (2,378)  (1,302)   (2,236) (16,910)
----------------------------------------------------------------------------
Financing Activities
Notes payable issued/(repaid), net          451     (423)    1,232     (100)
Long-term debt issued, net of issue
 costs                                    1,151        6     1,968   12,333
Long-term debt repaid                       (46)     (53)   (5,515)  (2,343)
Junior subordinated notes issued, net
 of issue costs                              (3)   1,551     3,468    1,551
Dividends on common shares                 (354)    (397)     (982)  (1,159)
Dividends on preferred shares               (39)     (28)     (116)     (74)
Distributions paid to non-controlling
 interests                                  (66)     (77)     (215)    (201)
Common shares issued, net of issue
 costs                                        6      (37)       42    4,337
Common shares repurchased                     -        -         -      (14)
Preferred shares issued, net of issue
 costs                                        -        -         -      492
Partnership units of TC PipeLines, LP
 issued, net of issue costs                  43       45       162      151
Common units of Columbia Pipeline
 Partners LP acquired                         -        -    (1,205)       -
----------------------------------------------------------------------------
Net cash provided by/(used in)
 financing activities                     1,143      587    (1,161)  14,973
----------------------------------------------------------------------------
Effect of Foreign Exchange Rate Changes
 on Cash and Cash Equivalents               (16)       3       (35)    (127)
----------------------------------------------------------------------------
(Decrease)/Increase in Cash and Cash
 Equivalents                                (66)     553       408    1,430
Cash and Cash Equivalents
Beginning of period                       1,490    1,727     1,016      850
----------------------------------------------------------------------------
Cash and Cash Equivalents
End of period                             1,424    2,280     1,424    2,280
----------------------------------------------------------------------------
----------------------------------------------------------------------------
See accompanying notes to the condensed consolidated financial statements.

                    Condensed consolidated balance sheet

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                         September  December
                                                               30,       31,
(unaudited - millions of Canadian $)                          2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
ASSETS
Current Assets
Cash and cash equivalents                                   1,424     1,016
Accounts receivable                                         2,820     2,075
Inventories                                                   390       368
Assets held for sale                                          431     3,717
Other                                                         743       908
----------------------------------------------------------------------------
                                                            5,808     8,084
Plant, Property and Equipment net of accumulated
                              depreciation of $23,257
                              and $22,263, respectively    55,842    54,475
Equity Investments                                          6,349     6,544
Regulatory Assets                                           1,309     1,322
Goodwill                                                   13,076    13,958
Intangible and Other Assets                                 3,215     3,026
Restricted Investments                                        810       642
----------------------------------------------------------------------------
                                                           86,409    88,051
----------------------------------------------------------------------------
LIABILITIES
Current Liabilities
Notes payable                                               1,963       774
Accounts payable and other                                  4,084     3,861
Dividends payable                                             559       526
Accrued interest                                              541       595
Liabilities related to assets held for sale                    18        86
Current portion of long-term debt                           4,216     1,838
----------------------------------------------------------------------------
                                                           11,381     7,680
Regulatory Liabilities                                      2,512     2,121
Other Long-Term Liabilities                                   745     1,183
Deferred Income Tax Liabilities                             8,069     7,662
Long-Term Debt                                             30,414    38,312
Junior Subordinated Notes                                   7,004     3,931
----------------------------------------------------------------------------
                                                           60,125    60,889
Common Units Subject to Rescission or Redemption                -     1,179
EQUITY
Common shares, no par value                                20,744    20,099
Issued and outstanding:       September 30, 2017 - 874
                              million shares
                              December 31, 2016 - 864
                              million shares
Preferred shares                                            3,980     3,980
Additional paid-in capital                                      -         -
Retained earnings                                           1,324     1,138
Accumulated other comprehensive loss                       (1,581)     (960)
----------------------------------------------------------------------------
Controlling Interests                                      24,467    24,257
Non-controlling interests                                   1,817     1,726
----------------------------------------------------------------------------
                                                           26,284    25,983
----------------------------------------------------------------------------
                                                           86,409    88,051
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Commitments, Contingencies and Guarantees (Note 13)

Variable Interest Entities (Note 14)

Subsequent Event (Note 15)

See accompanying notes to the condensed consolidated financial statements.

                 Condensed consolidated statement of equity

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                          nine months ended
                                                            September 30
                                                        --------------------
(unaudited - millions of Canadian $)                         2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Common Shares
Balance at beginning of period                             20,099    12,102
Shares issued on exercise of stock options                     46        70
Shares repurchased                                              -        (6)
Shares issued under dividend reinvestment and share
 purchase plan                                                599         -
Shares issued on exchange of subscription receipts              -     4,314
----------------------------------------------------------------------------
Balance at end of period                                   20,744    16,480
----------------------------------------------------------------------------
Preferred Shares
Balance at beginning of period                              3,980     2,499
Shares issued under public offering, net of issue costs         -       493
----------------------------------------------------------------------------
Balance at end of period                                    3,980     2,992
----------------------------------------------------------------------------
Additional Paid-In Capital
Balance at beginning of period                                  -         7
Issuance of stock options, net of exercises                     4         3
Dilution impact from TC PipeLines, LP units issued             18        17
Impact of common shares repurchased                             -        (8)
Impact of asset drop downs to TC PipeLines, LP               (202)      (38)
Impact of Columbia Pipeline Partners LP acquisition          (171)        -
Reclassification of Additional Paid-In Capital deficit
 to Retained Earnings                                         351        19
----------------------------------------------------------------------------
Balance at end of period                                        -         -
----------------------------------------------------------------------------
Retained Earnings
Balance at beginning of period                              1,138     2,769
Net income attributable to controlling interests            2,256       559
Common share dividends                                     (1,633)   (1,246)
Preferred share dividends                                     (98)      (71)
Adjustment related to employee share-based payments
 (Note 2)                                                      12         -
Reclassification of Additional Paid-In Capital deficit
 to Retained Earnings                                        (351)      (19)
----------------------------------------------------------------------------
Balance at end of period                                    1,324     1,992
----------------------------------------------------------------------------
Accumulated Other Comprehensive Loss
Balance at beginning of period                               (960)     (939)
Other comprehensive loss                                     (621)        3
----------------------------------------------------------------------------
Balance at end of period                                   (1,581)     (936)
----------------------------------------------------------------------------
Equity Attributable to Controlling Interests               24,467    20,528
----------------------------------------------------------------------------
Equity Attributable to Non-Controlling Interests
Balance at beginning of period                              1,726     1,717
Acquisition of non-controlling interests in Columbia
 Pipelines Partners LP                                          -     1,051
Net income attributable to non-controlling interests          189       184
Other comprehensive loss attributable to non-controlling
 interests                                                   (158)      (80)
Issuance of TC PipeLines, LP units
  Proceeds, net of issue costs                                162       151
  Decrease in TransCanada's ownership of TC PipeLines,
   LP                                                         (29)      (28)
Reclassification from/(to) common units of TC PipeLines,
 LP subject to rescission                                     106      (106)
Distributions declared to non-controlling interests          (212)     (200)
Impact of Columbia Pipeline Partners LP acquisition            33         -
----------------------------------------------------------------------------
Balance at end of period                                    1,817     2,689
----------------------------------------------------------------------------
Total Equity                                               26,284    23,217
----------------------------------------------------------------------------
----------------------------------------------------------------------------
See accompanying notes to the condensed consolidated financial statements.

            Notes to condensed consolidated financial statements

                                 (unaudited)

1. Basis of presentation

These condensed consolidated financial statements of TransCanada Corporation (TransCanada or the Company) have been prepared by management in accordance with U.S. GAAP. The accounting policies applied are consistent with those outlined in TransCanada's annual audited consolidated financial statements for the year ended December 31, 2016, except as described in Note 2, Accounting changes. Capitalized and abbreviated terms that are used but not otherwise defined herein are identified in TransCanada's 2016 Annual Report.

These condensed consolidated financial statements reflect adjustments, all of which are normal recurring adjustments that are, in the opinion of management, necessary to reflect fairly the financial position and results of operations for the respective periods. These condensed consolidated financial statements do not include all disclosures required in the annual financial statements and should be read in conjunction with the 2016 audited consolidated financial statements included in TransCanada's 2016 Annual Report. Certain comparative figures have been reclassified to conform with the current period's presentation.

Earnings for interim periods may not be indicative of results for the fiscal year in the Company's natural gas pipelines segments due to the timing of regulatory decisions and seasonal fluctuations in short-term throughput volumes on U.S. pipelines. Earnings for interim periods may also not be indicative of results for the fiscal year in the Company's Energy segment due to the impact of seasonal weather conditions on customer demand and market pricing in certain of the Company's investments in electrical power generation plants and non-regulated gas storage facilities.

USE OF ESTIMATES AND JUDGEMENTS

In preparing these financial statements, TransCanada is required to make estimates and assumptions that affect both the amount and timing of recording assets, liabilities, revenues and expenses since the determination of these items may be dependent on future events. The Company uses the most current information available and exercises careful judgement in making these estimates and assumptions. In the opinion of management, these condensed consolidated financial statements have been properly prepared within reasonable limits of materiality and within the framework of the Company's significant accounting policies included in the annual audited consolidated financial statements for the year ended December 31, 2016, except as described in Note 2, Accounting changes.

2. Accounting changes

CHANGES IN ACCOUNTING POLICIES FOR 2017

Inventory

In July 2015, the FASB issued new guidance on simplifying the measurement of inventory. The new guidance specifies that an entity should measure inventory within the scope of this guidance at the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. This new guidance was effective January 1, 2017, was applied prospectively and did not have a material impact on the Company's consolidated balance sheet.

Derivatives and hedging

In March 2016, the FASB issued new guidance that clarifies the requirements for assessing whether contingent call or put options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. The new guidance requires only an assessment of the four-step decision sequence outlined in U.S. GAAP to determine whether the economic characteristics and risks of call or put options are clearly and closely related to the economic characteristics and risks of their debt hosts. This new guidance was effective January 1, 2017, was applied prospectively and has not resulted in any impact on the Company's consolidated financial statements.

Equity method investments

In March 2016, the FASB issued new guidance that simplifies the transition to equity method accounting. The new guidance eliminates the requirement to retroactively apply the equity method of accounting when an increase in ownership interest in an investment qualifies it for equity method accounting. This new guidance was effective January 1, 2017, was applied prospectively and has not resulted in any impact on the Company's consolidated financial statements.

Employee share-based payments

In March 2016, the FASB issued new guidance that simplifies several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The new guidance also permits entities to make an accounting policy election either to continue to estimate the total number of awards for which the requisite service period will not be rendered or to account for forfeitures when they occur. The Company has elected to account for forfeitures when they occur. This new guidance was effective January 1, 2017 and resulted in a cumulative-effect adjustment of $12 million to opening retained earnings and the recognition of a deferred tax asset related to employee share-based payments that were made prior to the adoption of this guidance.

Consolidation

In October 2016, the FASB issued new guidance on consolidation relating to interests held through related parties that are under common control. The new guidance amends the consolidation requirements such that if a decision maker is required to evaluate whether it is the primary beneficiary of a VIE, it will need to consider only its proportionate indirect interest in the VIE held through a common control party. The new guidance was effective January 1, 2017, was applied retrospectively and did not result in any change to the Company's consolidation conclusions.

FUTURE ACCOUNTING CHANGES

Revenue from contracts with customers

In 2014, the FASB issued new guidance on revenue from contracts with customers. The new guidance requires that an entity recognize revenue in accordance with a prescribed model. This model is used to depict the transfer of promised goods or services to customers in an amount that reflects the total consideration to which it expects to be entitled during the term of the contract in exchange for those goods or services. The new guidance also requires additional disclosures about the nature, amount, timing and uncertainty of revenue and the related cash flows. The Company will adopt the new standard on the effective date of January 1, 2018. There are two methods in which the new standard can be adopted: (1) a full retrospective approach with restatement of all prior periods presented, or (2) a modified retrospective approach with a cumulative-effect adjustment as of the date of adoption. The Company will adopt the standard using the modified retrospective approach with the cumulative-effect of the adjustment recognized at the date of adoption, subject to allowable and elected practical expedients.

The Company has identified all existing customer contracts that are within the scope of the new guidance and is on schedule in the process of analyzing individual contracts or groups of contracts by operating segment to identify any significant changes in how revenues are recognized as a result of implementing the new guidance. The Company has completed its analysis of the Liquids Pipelines and Energy operating segments and has not identified any material differences in the amount and timing of revenue recognition. The Company is currently analyzing its Canadian, U.S. and Mexico Natural Gas Pipelines and has not yet concluded on the impact of the new guidance on these operating segments. The Company continues its contract analysis to obtain the information necessary to quantify the cumulative-effect adjustment, if any, on prior period revenues and revenue recognized going forward, and is monitoring additional authoritative or interpretive guidance related to the new standard as it becomes available.

Although consolidated revenues may not be materially impacted by the new guidance, the Company currently anticipates significant changes to disclosures based on the additional requirements prescribed. These new disclosures include information regarding the significant judgments used in evaluating when and how revenue is recognized and information related to contract assets and liabilities. In addition, the new guidance requires that the Company's revenue recognition policy disclosure includes additional detail regarding the various performance obligations and the nature, amount, timing and estimates of revenue and cash flows generated from contracts with customers. The Company continues to develop and evaluate disclosures required with a particular focus on the scope of contracts subject to disclosure of remaining performance obligations. The Company also continues to address any system and process changes necessary to compile the information to meet the recognition and disclosure requirements of the new guidance.

Financial instruments

In January 2016, the FASB issued new guidance on the accounting for equity investments and financial liabilities. The new guidance will change the income statement effect of equity investments and the recognition of changes in the fair value of financial liabilities when the fair value option is elected. The new guidance also requires the Company to assess valuation allowances for deferred tax assets related to available for sale debt securities in combination with their other deferred tax assets. This new guidance is effective January 1, 2018 and a method of adoption is specified for each component of the guidance. The Company is currently evaluating the impact of the adoption of this guidance and has not yet determined the effect on its consolidated financial statements.

Leases

In February 2016, the FASB issued new guidance on the accounting for leases. The new guidance amends the definition of a lease requiring the customer to have both (1) the right to obtain substantially all of the economic benefits from the use of the asset and (2) the right to direct the use of the asset in order for an arrangement to qualify as a lease. The new guidance also establishes a right-of-use (ROU) model that requires a lessee to recognize a ROU asset and corresponding lease liability on the balance sheet for all leases with a term longer than 12 months. Leases will be classified as finance or operating, with classification affecting the pattern of expense recognition in the income statement. The new guidance does not make extensive changes to lessor accounting.

The new guidance is effective on January 1, 2019, with early adoption permitted. A modified retrospective transition approach is required for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. The Company is continuing to identify and analyze existing lease agreements to determine the effect of adoption of the new guidance on its consolidated financial statements. The Company is also addressing system and process changes necessary to compile the information to meet the recognition and disclosure requirements of the new guidance.

Measurement of credit losses on financial instruments

In June 2016, the FASB issued new guidance that significantly changes how entities measure credit losses for most financial assets and certain other financial instruments that are not measured at fair value through net income. The new guidance amends the impairment model of financial instruments basing it on expected losses rather than incurred losses. These expected credit losses will be recognized as an allowance rather than a direct write down of the amortized cost basis. The new guidance is effective January 1, 2020 and will be applied using a modified retrospective approach. The Company is currently evaluating the impact of the adoption of this guidance and has not yet determined the effect on its consolidated financial statements.

Income taxes

In October 2016, the FASB issued new guidance on the income tax effects of intra-entity transfers of assets other than inventory. The new guidance requires the recognition of deferred and current income taxes for an intra-entity asset transfer when the transfer occurs. The new guidance is effective January 1, 2018 and will be applied using a modified retrospective approach. The Company is currently evaluating the impact of the adoption of this guidance and has not yet determined the effect on its consolidated financial statements.

Restricted cash

In November 2016, the FASB issued new guidance on restricted cash and cash equivalents on the statement of cash flows. The new guidance requires that the statement of cash flows explain the change during the period in the total cash and cash equivalents balance, and amounts generally described as restricted cash or restricted cash equivalents. Restricted cash and cash equivalents will be included with Cash and cash equivalents when reconciling the beginning of year and end of year total amounts on the statement of cash flows. This new guidance is effective January 1, 2018 and will be applied retrospectively.

Goodwill impairment

In January 2017, the FASB issued new guidance on simplifying the test for goodwill impairment by eliminating Step 2 of the impairment test, which is the requirement to calculate the implied fair value of goodwill to measure the impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. This new guidance is effective January 1, 2020 and will be applied prospectively, however, early adoption is permitted.

Employee post-retirement benefits

In March 2017, the FASB issued new guidance that will require entities to disaggregate the current service cost component from the other components of net benefit cost and present it with other current compensation costs for related employees in the income statement. The new guidance also requires that the other components of net benefit cost be presented elsewhere in the income statement and excluded from income from operations if such a subtotal is presented. In addition, the new guidance makes changes to the components of net benefit cost that are eligible for capitalization. Entities must use a retrospective transition method to adopt the requirement for separate presentation in the income statement of the components of net benefit cost, and a prospective transition method to adopt the change to capitalization of benefit costs. This new guidance is effective January 1, 2018. The Company does not expect a material impact on its consolidated financial statements.

Amortization on purchased callable debt securities

In March 2017, the FASB issued new guidance that shortens the amortization period for the premium on certain purchased callable debt securities by requiring entities to amortize the premium to the earliest call date. This new guidance is effective January 1, 2019 and will be applied using a modified retrospective approach. The Company is currently evaluating the impact of the adoption of this guidance and has not yet determined the effect on its consolidated financial statements.

Hedge accounting

In August 2017, the FASB issued new guidance on hedge accounting, making more financial and non-financial hedging strategies eligible for hedge accounting. The new guidance also amends the presentation requirements relating to the change in fair value of a derivative and additional disclosure requirements include cumulative basis adjustments for fair value hedges and the effect of hedging on individual statement of income line items. This new guidance is effective January 1, 2019, with early adoption permitted, and will be applied prospectively with a cumulative-effect adjustment to opening retained earnings on adoption. The Company is currently evaluating the impact of the adoption of this guidance, however it does not anticipate a material impact on its consolidated financial statements.

3. Segmented information


----------------------------------------------------------------------------
----------------------------------------------------------------------------
three months
 ended
 September
 30, 2017     Canadian      U.S.    Mexico
(unaudited -   Natural   Natural   Natural
 millions of       Gas       Gas       Gas   Liquids
 Canadian $) Pipelines Pipelines Pipelines Pipelines Energy Corporate  Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues          921       811       139       437    934         -  3,242
Income/
 (loss) from
 equity
 investments        4        53       (11)        4     99         7    156
Plant
 operating
 costs and
 other           (318)     (341)      (10)     (145)  (126)      (36)  (976)
Commodity
 purchases
 resold             -         -         -         -   (621)        -   (621)
Property
 taxes            (63)      (41)        -       (22)    (1)        -   (127)
Depreciation
 and
 amortizatio
 n               (228)     (145)      (23)      (71)   (39)        -   (506)
Loss on sale
 of assets          -         -         -         -     (9)        -     (9)
----------------------------------------------------------------------------
Segmented
 earnings/
 (loss)           316       337        95       203    237       (29) 1,159
---------------------------------------------------------------------
Interest expense                                                       (504)
Allowance for funds used during construction                            145
Interest income and other                                                84
----------------------------------------------------------------------------
Income before income taxes                                              884
Income tax expense                                                     (188)
----------------------------------------------------------------------------
Net income                                                              696
Net income attributable to non-controlling interests                    (44)
----------------------------------------------------------------------------
Net income attributable to controlling interests                        652
Preferred share dividends                                               (40)
----------------------------------------------------------------------------
Net income attributable to common shares                                612
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------
three months
 ended
 September
 30, 2016     Canadian      U.S.    Mexico
(unaudited -   Natural   Natural   Natural
 millions of       Gas       Gas       Gas   Liquids
 Canadian $) Pipelines Pipelines Pipelines Pipelines Energy Corporate  Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues          951       812       121       440  1,308         -  3,632
Income/
 (loss) from
 equity
 investments        3        65        (2)        -     88         -    154
Plant
 operating
 costs and
 other           (340)     (369)       (8)     (163)  (261)      (36)(1,177)
Commodity
 purchases
 resold             -         -         -         -   (783)        -   (783)
Property
 taxes            (65)      (38)        -       (21)   (12)        -   (136)
Depreciation
 and
 amortizatio
 n               (220)     (138)      (13)      (73)   (83)        -   (527)
Asset
 impairment
 charges            -         -         -         - (1,085)        - (1,085)
----------------------------------------------------------------------------
Segmented
 earnings/
 (losses)         329       332        98       183   (828)      (36)    78
---------------------------------------------------------------------
Interest expense                                                       (522)
Allowance for funds used during construction                            110
Interest income and other                                                12
----------------------------------------------------------------------------
Loss before income taxes                                               (322)
Income tax recovery                                                     266
----------------------------------------------------------------------------
Net loss                                                                (56)
Net income attributable to non-controlling interests                    (52)
----------------------------------------------------------------------------
Net loss attributable to controlling interests                         (108)
Preferred share dividends                                               (27)
----------------------------------------------------------------------------
Net loss attributable to common shares                                 (135)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------
nine months
 ended
 September
 30, 2017     Canadian      U.S.    Mexico
(unaudited -   Natural   Natural   Natural
 millions of       Gas       Gas       Gas   Liquids
 Canadian $) Pipelines Pipelines Pipelines Pipelines Energy Corporate  Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues        2,725     2,684       432     1,410  2,599         -  9,850
Income/
 (loss) from
 equity
 investments        9       175         -         3    341        (1)   527
Plant
 operating
 costs and
 other           (958)     (973)      (29)     (437)  (482)     (101)(2,980)
Commodity
 purchases
 resold             -         -         -         - (1,711)        - (1,711)
Property
 taxes           (201)     (136)        -       (67)   (38)        -   (442)
Depreciation
 and
 amortizatio
 n               (672)     (451)      (70)     (228)  (118)        - (1,539)
Gain on sale
 of assets          -         -         -         -    489         -    489
----------------------------------------------------------------------------
Segmented
 earnings/
 (loss)           903     1,299       333       681  1,080      (102) 4,194
---------------------------------------------------------------------
Interest expense                                                     (1,528)
Allowance for funds used during construction                            367
Interest income and other                                               193
----------------------------------------------------------------------------
Income before income taxes                                            3,226
Income tax expense                                                     (781)
----------------------------------------------------------------------------
Net income                                                            2,445
Net income attributable to non-controlling interests                   (189)
----------------------------------------------------------------------------
Net income attributable to controlling interests                      2,256
Preferred share dividends                                              (120)
----------------------------------------------------------------------------
Net income attributable to common shares                              2,136
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------
nine months
 ended
 September
 30, 2016     Canadian      U.S.    Mexico
(unaudited -   Natural   Natural   Natural
 millions of       Gas       Gas       Gas   Liquids
 Canadian $) Pipelines Pipelines Pipelines Pipelines Energy Corporate  Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Revenues        2,677     1,585       249     1,292  3,083         -  8,886
Income/
 (loss) from
 equity
 investments        9       150        (2)       (1)   199         -    355
Plant
 operating
 costs and
 other           (886)     (597)      (34)     (417)  (625)      (87)(2,646)
Commodity
 purchases
 resold             -         -         -         - (1,628)        - (1,628)
Property
 taxes           (202)      (78)        -       (67)   (58)        -   (405)
Depreciation
 and
 amortizatio
 n               (655)     (269)      (29)     (214)  (258)        - (1,425)
Asset
 impairment
 charges            -         -         -         - (1,296)        - (1,296)
Loss on sale
 of assets          -        (4)        -         -      -         -     (4)
----------------------------------------------------------------------------
Segmented
 earnings/(l
 osses)           943       787       184       593   (583)      (87) 1,837
---------------------------------------------------------------------
Interest expense                                                     (1,456)
Allowance for funds used during construction                            322
Interest income and other                                               118
----------------------------------------------------------------------------
Income before income taxes                                              821
Income tax expense                                                      (78)
----------------------------------------------------------------------------
Net Income                                                              743
Net income attributable to non-controlling interests                   (184)
----------------------------------------------------------------------------
Net Income attributable to controlling interests                        559
Preferred share dividends                                               (77)
----------------------------------------------------------------------------
Net Income attributable to common shares                                482
----------------------------------------------------------------------------
----------------------------------------------------------------------------

TOTAL ASSETS

----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                September 30,   December 31,
(unaudited - millions of Canadian $)                     2017           2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Canadian Natural Gas Pipelines                         17,010         15,816
U.S. Natural Gas Pipelines                             34,897         34,422
Mexico Natural Gas Pipelines                            5,470          5,013
Liquids Pipelines                                      16,436         16,896
Energy                                                  8,979         13,169
Corporate                                               3,617          2,735
----------------------------------------------------------------------------
                                                       86,409         88,051
----------------------------------------------------------------------------
----------------------------------------------------------------------------

4. Assets held for sale

Solar Assets

On October 24, 2017, the Company entered into an agreement to sell its Ontario Solar assets to a third party for approximately $540 million. The sale is expected to close by the end of 2017, subject to certain regulatory and other approvals, and will include customary closing adjustments. An estimated gain of $130 million ($100 million after-tax) is expected to be recognized upon closing of the transaction.

At September 30, 2017, the related assets and liabilities were classified as held for sale in the Energy segment as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------

(unaudited - millions of Canadian $)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Assets held for sale
Accounts receivable                                                        6
Inventories                                                                1
Plant, property and equipment                                            424
----------------------------------------------------------------------------
Total assets held for sale                                               431
----------------------------------------------------------------------------
Liabilities related to assets held for sale
Accounts payable and other                                                 1
Other long-term liabilities                                               17
----------------------------------------------------------------------------
Total liabilities related to assets held for sale                         18
----------------------------------------------------------------------------
----------------------------------------------------------------------------

5. Income taxes

The effective tax rates for the nine-month periods ended September 30, 2017 and 2016 were 24 per cent and 10 per cent, respectively. The higher effective tax rate in 2017 was primarily the result of changes in the proportion of income earned between Canadian and foreign jurisdictions and the goodwill impairment charge in 2016.

6. Long-term debt

LONG-TERM DEBT ISSUED

The Company issued long-term debt in the nine months ended September 30, 2017 as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited -
 millions of
 Canadian $,
 unless noted
 otherwise)                                                         Interest
Company           Issue date     Type         Maturity date  Amount     rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TRANSCANADA PIPELINES LIMITED
                  September 2017 Medium Term
                                 Notes           March 2028     300    3.39%
                  September 2017 Medium Term
                                 Notes       September 2047     700    4.33%
TUSCARORA GAS TRANSMISSION COMPANY
                  August 2017    Term Loan      August 2020   US 25 Floating
TC PIPELINES, LP
                  May 2017       Senior
                                 Unsecured
                                 Notes             May 2027  US 500    3.90%
----------------------------------------------------------------------------

LONG-TERM DEBT RETIRED

The Company retired long-term debt in the nine months ended September 30, 2017 as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited -
 millions of
 Canadian $, unless
 noted otherwise)    Retirement                                     Interest
Company              date           Type                   Amount      rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TUSCARORA GAS TRANSMISSION COMPANY
                     August 2017    Senior Secured
                                    Notes                   US 12      3.82%
TRANSCANADA PIPELINES LIMITED
                     June 2017      Acquisition Bridge
                                    Facility             US 1,513   Floating
                     February 2017  Acquisition Bridge
                                    Facility               US 500   Floating
                     January 2017   Medium Term Notes         300      5.10%
TRANSCANADA PIPELINE USA LTD.
                     June 2017      Acquisition Bridge
                                    Facility               US 630   Floating
                     April 2017     Acquisition Bridge
                                    Facility             US 1,070   Floating
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The acquisition bridge facilities were put into place to finance a portion of the Columbia acquisition. Proceeds from the sale of the U.S. Northeast power assets were used to fully retire the remaining acquisition bridge facilities in second quarter 2017.

In the three and nine months ended September 30, 2017, TransCanada capitalized interest related to capital projects of $49 million and $150 million (2016 - $46 million and $133 million).

7. Junior subordinated notes issued


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited -
 millions of
 Canadian $,
 unless noted
 otherwise)                                                         Interest
Company           Issue date     Type         Maturity date  Amount     rate
----------------------------------------------------------------------------
----------------------------------------------------------------------------
TRANSCANADA PIPELINES LIMITED
                  May 2017       Junior
                                 Subordinated
                                 Notes(1,2)        May 2077   1,500    4.90%
                  March 2017     Junior
                                 Subordinated                    US
                                 Notes(1,2)      March 2077   1,500    5.55%
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) The Junior subordinated notes are subordinated in right of payment to
    existing and future senior indebtedness or other obligations of TCPL.
(2) The Junior subordinated notes were issued to TransCanada Trust (the
    Trust), a financing trust subsidiary wholly-owned by TCPL. While the
    obligations of the Trust are fully and unconditionally guaranteed by
    TCPL on a subordinated basis, the Trust is not consolidated in
    TransCanada's financial statements because TCPL does not have a variable
    interest in the Trust and the only substantive assets of the Trust are
    junior subordinated notes of TCPL.

In May 2017, the Trust issued $1.5 billion of Trust Notes - Series 2017-B (Trust Notes) to third party investors with a fixed interest rate of 4.65 per cent for the first ten years converting to a floating rate thereafter. All of the proceeds of the issuance by the Trust were loaned to TCPL for $1.5 billion of junior subordinated notes of TCPL at an initial fixed rate of 4.90 per cent, including a 0.25 per cent administration charge. The rate will reset commencing May 2027 until May 2047 to the then three month Bankers' Acceptance rate plus 3.33 per cent per annum; from May 2047 until May 2077, the interest rate will reset to the then three month Bankers' Acceptance rate plus 4.08 per cent per annum. The junior subordinated notes are callable at TCPL's option at any time on or after May 18, 2027 at 100 per cent of the principal amount plus accrued and unpaid interest to the date of redemption.

In March 2017, the Trust issued US$1.5 billion of Trust Notes - Series 2017-A (Trust Notes) to third party investors with a fixed interest rate of 5.30 per cent for the first ten years converting to a floating rate thereafter. All of the proceeds of the issuance by the Trust were loaned to TCPL for US$1.5 billion of junior subordinated notes of TCPL at an initial fixed rate of 5.55 per cent, including a 0.25 per cent administration charge. The rate will reset commencing March 2027 until March 2047 to the then three month LIBOR plus 3.458 per cent per annum; from March 2047 until March 2077, the interest rate will reset to the then three month LIBOR plus 4.208 per cent per annum. The junior subordinated notes are callable at TCPL's option at any time on or after March 15, 2027 at 100 per cent of the principal amount plus accrued and unpaid interest to the date of redemption.

Pursuant to the terms of the Trust Notes and related agreements, in certain circumstances (1) TCPL may issue deferral preferred shares to holders of the Trust Notes in lieu of interest; and (2) TransCanada and TCPL would be prohibited from declaring or paying dividends on or redeeming their outstanding preferred shares (or, if none are outstanding, their respective common shares) until all deferral preferred shares are redeemed by TCPL. The Trust Notes may also be automatically exchanged for preferred shares of TCPL upon certain kinds of bankruptcy and insolvency events. All of these preferred shares would rank equally with any other outstanding first preferred shares of TCPL.

8. Common units subject to rescission or redemption

Columbia Pipeline Partners LP acquisition

On February 17, 2017, the Company acquired all outstanding publicly held common units of Columbia Pipeline Partners LP (CPPL) at a price of US$17.00 and a stub period distribution payment of US$0.10 per common unit for an aggregate transaction value of US$921 million. As this was a transaction between entities under common control, it was recognized in equity.

At December 31, 2016, the entire $1,073 million (US$799 million) of the Company's non-controlling interest in CPPL was recorded as Common units subject to rescission or redemption on the condensed consolidated balance sheet.

Common units of TC PipeLines, LP subject to rescission

In 2017, rescission rights on 1.6 million TC PipeLines, LP common units expired and $106 million (US$82 million) was reclassified to equity. At September 30, 2017, there were no outstanding Common units subject to rescission or redemption on the condensed consolidated balance sheet (December 31, 2016 - $106 million (US$82 million)).

9. Other comprehensive (loss)/income and accumulated other comprehensive loss

Components of other comprehensive (loss)/income, including the portion attributable to non-controlling interests and related tax effects, are as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------

three months ended September 30, 2017                 Income Tax         Net
                                          Before Tax   Recovery/      of Tax
(unaudited - millions of Canadian $)          Amount     Expense      Amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Foreign currency translation losses on
 net investment in foreign operations          (364)         (6)       (370)
Change in fair value of net investment
 hedges                                          (1)          -          (1)
Change in fair value of cash flow hedges          1           -           1
Unrealized actuarial gains and losses on
 pension and other post-retirement
 benefit plans                                    5          (3)          2
Reclassification of actuarial gains and
 losses on pension and other post-
 retirement benefit plans                         6          (2)          4
Other comprehensive income on equity
 investments                                      4          (1)          3
----------------------------------------------------------------------------
Other comprehensive loss                       (349)        (12)       (361)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

three months ended September 30, 2016                 Income Tax         Net
                                          Before Tax   Recovery/      of Tax
(unaudited - millions of Canadian $)          Amount     Expense      Amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Foreign currency translation gains on
 net investment in foreign operations            55           -          55
Change in fair value of net investment
 hedges                                          (2)          1          (1)
Change in fair value of cash flow hedges          6          (1)          5
Reclassification to net income of gains
 and losses on cash flow hedges                   1          (1)          -
Reclassification of actuarial gains and
 losses on pension and other post-
 retirement benefit plans                         6          (2)          4
Other comprehensive income on equity
 investments                                      5          (1)          4
----------------------------------------------------------------------------
Other comprehensive income                       71          (4)         67
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

nine months ended September 30, 2017                  Income Tax         Net
                                          Before Tax   Recovery/      of Tax
(unaudited - millions of Canadian $)          Amount     Expense      Amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Foreign currency translation losses on
 net investment in foreign operations          (717)         (4)       (721)
Reclassification of foreign currency
 translation gains on net investment on
 disposal of foreign operations                 (77)          -         (77)
Change in fair value of net investment
 hedges                                          (4)          1          (3)
Change in fair value of cash flow hedges          5          (1)          4
Reclassification to net income of gains
 and losses on cash flow hedges                  (2)          1          (1)
Unrealized actuarial gains and losses on
 pension and other post-retirement
 benefit plans                                    5          (3)          2
Reclassification of actuarial gains and
 losses on pension and other post-
 retirement benefit plans                        16          (5)         11
Other comprehensive income on equity
 investments                                      8          (2)          6
----------------------------------------------------------------------------
Other comprehensive loss                       (766)        (13)       (779)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

----------------------------------------------------------------------------
----------------------------------------------------------------------------

nine months ended September 30, 2016                  Income Tax         Net
                                          Before Tax   Recovery/      of Tax
(unaudited - millions of Canadian $)          Amount     Expense      Amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Foreign currency translation losses on
 net investment in foreign operations          (150)         (2)       (152)
Change in fair value of net investment
 hedges                                         (12)          3          (9)
Change in fair value of cash flow hedges         33         (12)         21
Reclassification to net income of gains
 and losses on cash flow hedges                  65         (25)         40
Reclassification of actuarial gains and
 losses on pension and other post-
 retirement benefit plans                        17          (5)         12
Other comprehensive income on equity
 investments                                     14          (3)         11
----------------------------------------------------------------------------
Other comprehensive loss                        (33)        (44)        (77)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The changes in AOCI by component are as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
three months ended
 September 30, 2017         Currency    Cash Pension and
(unaudited - millions of Translation    Flow   OPEB Plan      Equity
 Canadian $)             Adjustments  Hedges Adjustments InvestmentsTotal(1)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
AOCI balance at July 1,
 2017                          (716)    (27)       (201)       (345) (1,289)
Other comprehensive
 (loss)/income before
 reclassifications(2,3)        (303)      2           2           -    (299)
Amounts reclassified
 from accumulated other
 comprehensive loss               -       -           4           3       7
----------------------------------------------------------------------------
Net current period other
 comprehensive
 (loss)/income                 (303)      2           6           3    (292)
----------------------------------------------------------------------------
AOCI balance at
 September 30, 2017          (1,019)    (25)       (195)       (342) (1,581)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) All amounts are net of tax. Amounts in parentheses indicate losses
    recorded to OCI.
(2) Other comprehensive (loss)/income before reclassifications on currency
    translation adjustments and cash flow hedges is net of non-controlling
    interest losses of $68 million and losses of $1 million, respectively.
(3) Other comprehensive (loss)/income before reclassifications on pension
    and OPEB plan adjustments includes a $27 million reduction on
    settlements and curtailments.

----------------------------------------------------------------------------
----------------------------------------------------------------------------
nine months ended
 September 30, 2017         Currency    Cash Pension and
(unaudited - millions of Translation    Flow   OPEB Plan      Equity
 Canadian $)             Adjustments  Hedges Adjustments Investments  Total1
----------------------------------------------------------------------------
----------------------------------------------------------------------------
AOCI balance at January
 1, 2017                       (376)    (28)       (208)       (348)   (960)
Other comprehensive
 (loss)/income before
 reclassifications(2,3)        (566)      4           2           -    (560)
Amounts reclassified
 from accumulated other
 comprehensive loss             (77)     (1)         11           6     (61)
----------------------------------------------------------------------------
Net current period other
 comprehensive
 (loss)/income(4)              (643)      3          13           6    (621)
----------------------------------------------------------------------------
AOCI balance at
 September 30, 2017          (1,019)    (25)       (195)       (342) (1,581)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) All amounts are net of tax. Amounts in parentheses indicate losses
    recorded to OCI.
(2) Other comprehensive (loss)/income before reclassifications on currency
    translation adjustments net of non-controlling interest losses of $158
    million.
(3) Other comprehensive (loss)/income before reclassifications on pension
    and OPEB plan adjustments includes a $27 million reduction on
    settlements and curtailments.
(4) Losses related to cash flow hedges reported in AOCI and expected to be
    reclassified to net income in the next 12 months are estimated to be $10
    million ($7 million, net of tax) at September 30, 2017. These estimates
    assume constant commodity prices, interest rates and foreign exchange
    rates over time, however, the amounts reclassified will vary based on
    the actual value of these factors at the date of settlement.

Details about reclassifications out of AOCI into the consolidated statement of income are as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                         Affected line item
                          Amounts reclassified from       in the condensed
                        accumulated other comprehensive     consolidated
                                    loss(1)              statement of income
                       ---------------------------------
                         three months     nine months
                             ended           ended
                         September 30    September 30
--------------------------------------------------------
(unaudited - millions     2017    2016    2017    2016
 of Canadian $)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Cash flow hedges
 Commodities                 4       7      15     (54) Revenues (Energy)
                                                        Interest income and
 Foreign exchange            -      (5)      -       -  other
 Interest rate              (4)     (3)    (13)    (11) Interest expense
----------------------------------------------------------------------------
                             -      (1)      2     (65) Total before tax
                             -       1      (1)     25  Income tax expense
----------------------------------------------------------------------------
                             -       -       1     (40) Net of tax
----------------------------------------------------------------------------
Pension and other post-
 retirement benefit
 plan adjustments
 Amortization of                                        Plant operating
  actuarial loss            (4)     (6)    (12)    (17) costs and other(2)
                                                        Plant operating
 Settlement charge          (2)      -      (2)      -  costs and other(2)
----------------------------------------------------------------------------
                            (6)     (6)    (14)    (17) Total before tax
                             2       2       5       5  Income tax expense
----------------------------------------------------------------------------
                            (4)     (4)     (9)    (12) Net of tax
----------------------------------------------------------------------------
Equity investments
                                                        Income from equity
 Equity income              (4)     (5)     (8)    (14) investments
                             1       1       2       3  Income tax expense
----------------------------------------------------------------------------
                            (3)     (4)     (6)    (11) Net of tax
----------------------------------------------------------------------------
Currency translation
 adjustments
 Realization of foreign
  currency translation
  gain on disposal of                                   (Loss)/Gain on sale
  foreign operations         -       -      77       -  of assets
                             -       -       -       -  Income tax expense
----------------------------------------------------------------------------
                             -       -      77       -  Net of tax
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) All amounts in parentheses indicate expenses to the condensed
    consolidated statement of income.
(2) These accumulated other comprehensive loss components are included in
    the computation of net benefit cost. Refer to Note 10 for additional
    detail.

10. Employee post-retirement benefits

As a result of settlements and curtailments that occurred upon the completion of the U.S. Northeast power generation asset sales, remeasurements were performed in the third quarter on TransCanada's U.S. defined benefit plan (DB plan) and other post-retirement benefit plans. The U.S. DB plan and other post-retirement benefit plan remeasurements used a weighted average discount rate of 4.10 per cent. All other assumptions were consistent with those employed at December 31, 2016. The impact of these remeasurements reduced the DB plan's unrealized actuarial losses by $3 million, which was included in Other comprehensive income, and resulted in a settlement charge of $2 million which was recorded in net benefit cost in third quarter 2017. These remeasurements had no impact on the other post-retirement benefit plan's unrealized actuarial losses.

In third quarter 2017, the year to date lump sum payouts exceeded service and interest costs for the Columbia's DB plan. As a result, remeasurements were performed on the Columbia DB plan using a discount rate of 3.70 per cent. All other assumptions were consistent with those employed at December 31, 2016. The remeasurement of the Columbia DB plan increased the Company's unrealized actuarial gains by $16 million, of which $14 million was recorded in Regulatory assets and $2 million was recorded in Other comprehensive income.

The net benefit cost recognized for the Company's defined benefit pension plans and other post-retirement benefit plans is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
             three months ended September 30 nine months ended September 30
             ---------------------------------------------------------------
                               Other post-                     Other post-
             Pension benefit   retirement    Pension benefit   retirement
                  plans       benefit plans       plans       benefit plans
             ---------------------------------------------------------------
(unaudited -
 millions of
 Canadian $)   2017    2016    2017    2016    2017    2016    2017    2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Service cost     25      28       1       1      81      79       3       2
Interest cost    30      34       3       4      92      93      10       9
Expected
 return on
 plan assets    (45)    (48)     (5)     (5)   (134)   (127)    (16)     (6)
Amortization
 of actuarial
 loss             3       5       1       1      11      15       1       2
Amortization
 of
 regulatory
 asset           26       8       -       -      33      17       1       -
Amortization
 of
 transitional
 obligation
 related to
 regulated
 business         -       -       -       -       -       -       -       1
Settlement
 charge           2       -       -       -       2       -       -       -
----------------------------------------------------------------------------
Net benefit
 cost
 recognized      41      27       -       1      85      77      (1)      8
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Effective April 1, 2017, the Company closed its U.S. DB plan to non-union new entrants. As of April 1, 2017, all non-union hires will participate in the existing defined contribution plan (DC plan). Non-union U.S. employees who currently participate in the DC plan will have one final election opportunity to become a member of the U.S. DB plan as of January 1, 2018.

11. Risk management and financial instruments

RISK MANAGEMENT OVERVIEW

TransCanada has exposure to market risk and counterparty credit risk, and has strategies, policies and limits in place to manage the impact of these risks on earnings and cash flow.

COUNTERPARTY CREDIT RISK

TransCanada's maximum counterparty credit exposure with respect to financial instruments at September 30, 2017, without taking into account security held, consisted of cash and cash equivalents, accounts receivable, available for sale assets, derivative assets, loans and advances receivable. The Company regularly reviews its accounts receivable and records an allowance for doubtful accounts as necessary using the specific identification method. At September 30, 2017, there were no significant amounts past due or impaired, no significant credit risk concentration and no significant credit losses during the period.

LOAN RECEIVABLE FROM AFFILIATE

Related party transactions are conducted in the normal course of business and are measured at the exchange amount, which is the amount of consideration established and agreed to by the related parties.

TransCanada holds a 60 per cent equity interest in a joint venture with IEnova to build, own and operate the Sur de Texas pipeline. The Company accounts for the joint venture as an equity investment. On April 21, 2017, TransCanada entered into a MXN$13.6 billion unsecured revolving credit facility with the joint venture, which bears interest at a floating rate and matures in March 2022. At September 30, 2017, Intangible and other assets on the Company's condensed consolidated balance sheet included a $578 million loan receivable from the Sur de Texas joint venture. This loan receivable represents TransCanada's proportionate share of the debt financing requirements related to the joint venture and is included in Contributions to equity investments on the Company's condensed consolidated statement of cash flows. Interest income and other included income of $11 million and $14 million for the three and nine months ended September 30, 2017. These amounts were offset by a corresponding expense recorded in Income from equity investments.

NET INVESTMENT IN FOREIGN OPERATIONS

The Company hedges its net investment in foreign operations (on an after-tax basis) with U.S. dollar-denominated debt, cross-currency interest rate swaps and foreign exchange forward contracts and options.

The fair values and notional or principal amounts for the derivatives designated as a net investment hedge were as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                    September 30, 2017    December 31, 2016
                                   -----------------------------------------
                                            Notional or          Notional or
(unaudited - millions of Canadian      Fair   principal     Fair   principal
 $, unless noted otherwise)        value(1)      amount value(1)      amount
----------------------------------------------------------------------------
----------------------------------------------------------------------------
U.S. dollar cross-currency interest
 rate swaps (maturing 2017 to
 2019)(2)                             (222)    US 1,400    (425)    US 2,350
U.S. dollar foreign exchange
 forward contracts                       -            -      (7)      US 150
----------------------------------------------------------------------------
                                      (222)    US 1,400    (432)    US 2,500
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Fair values equal carrying values.
(2) In the three and nine months ended September 30, 2017, Net income
    includes net realized gains of $1 million and $3 million, respectively,
    (2016 - gains of $1 million and $5 million, respectively) related to the
    interest component of cross-currency swap settlements which are reported
    within Interest expense.

The notional amounts and fair value of U.S. dollar-denominated debt designated as a net investment hedge were as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
(unaudited - millions of Canadian $,
 unless noted otherwise)              September 30, 2017   December 31, 2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Notional amount                       24,900 (US 19,900)  26,600 (US 19,800)
Fair value                            28,300 (US 22,600)  29,400 (US 21,900)
----------------------------------------------------------------------------
----------------------------------------------------------------------------

FINANCIAL INSTRUMENTS

Non-derivative financial instruments

Fair value of non-derivative financial instruments

The fair value of Long-term debt and Junior subordinated notes is estimated using an income approach based on quoted market prices for the same or similar debt instruments from external data service providers.

Available for sale assets are recorded at fair value which is calculated using quoted market prices where available. Certain non-derivative financial instruments included in cash and cash equivalents, accounts receivable, intangible and other assets, notes payable, accounts payable and other, accrued interest and other long-term liabilities have carrying amounts that approximate their fair value due to the nature of the item or the short time to maturity and would also be classified in Level II of the fair value hierarchy.

Credit risk has been taken into consideration when calculating the fair value of non-derivative instruments.

Balance sheet presentation of non-derivative financial instruments

The following table details the fair value of the Company's non-derivative financial instruments, excluding those where carrying amounts approximate fair value, which would be classified in Level II of the fair value hierarchy:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                     September 30, 2017   December 31, 2016
                                    ----------------------------------------
                                      Carrying      Fair  Carrying      Fair
(unaudited - millions of Canadian $)    amount     value    amount     value
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Long-term debt including current
 portion(1,2)                         (34,630)  (39,627)  (40,150)  (45,047)
Junior subordinated notes              (7,004)   (7,238)   (3,931)   (3,825)
----------------------------------------------------------------------------
                                      (41,634)  (46,865)  (44,081)  (48,872)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Long-term debt is recorded at amortized cost except for US$850 million
    (December 31, 2016 - US$850 million) that is attributed to hedged risk
    and recorded at fair value.
(2) Net income for the three and nine months ended September 30, 2017
    included unrealized gains of $1 million and $2 million, respectively,
    (2016 unrealized gains of $7 million and losses of $6 million,
    respectively) for fair value adjustments attributable to the hedged
    interest rate risk associated with interest rate swap fair value hedging
    relationships on US$850 million of long-term debt at September 30, 2017
    (December 31, 2016 - US$850 million). There were no other unrealized
    gains or losses from fair value adjustments to the non-derivative
    financial instruments.

Available for sale assets summary

The following tables summarize additional information about the Company's restricted investments that are classified as available for sale assets:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                           September 30, 2017          December 31, 2016
                       -------------------------- --------------------------
                              LMCI          Other        LMCI          Other
(unaudited - millions   restricted     restricted  restricted     restricted
 of Canadian $)        investments investments(2) investments investments(2)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Fair Values(1)
  Fixed income
   securities (maturing
   within 1 year)                -             25           -             19
  Fixed income
   securities (maturing
   within 1-5 years)             -             97           -            117
  Fixed income
   securities (maturing
   within 5-10 years)           24              -           9              -
  Fixed income
   securities (maturing
   after 10 years)             679              -         513              -
----------------------------------------------------------------------------
                               703            122         522            136
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Available for sale assets are recorded at fair value and included in
    Other current assets and Restricted investments on the condensed
    consolidated balance sheet.
(2) Other restricted investments have been set aside to fund insurance claim
    losses to be paid by the Company's wholly-owned captive insurance
    subsidiary.
----------------------------------------------------------------------------
----------------------------------------------------------------------------
                           September 30, 2017         September 30, 2016
                       -----------------------------------------------------
                              LMCI                       LMCI
                        restricted          Other  restricted          Other
(unaudited - millions  investments     restricted investments     restricted
 of Canadian $)                (1) investments(2)         (1) investments(2)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Net unrealized
 (losses)/gains in the
 period
  three months ended          (38)              -           3              -
  nine months ended           (23)              -          25              1
----------------------------------------------------------------------------
Net realized
 (losses)/gains in the
 period
  three months ended            -               -           1              -
  nine months ended            (1)              -           1              -
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Gains and losses arising from changes in the fair value of LMCI
    restricted investments impact the subsequent amounts to be collected
    through tolls to cover future pipeline abandonment costs. As a result,
    the Company records these gains and losses as regulatory assets or
    liabilities.
(2) Unrealized gains and losses on other restricted investments are included
    in OCI.

Derivative instruments

Fair value of derivative instruments

The fair value of foreign exchange and interest rate derivatives has been calculated using the income approach which uses period end market rates and applies a discounted cash flow valuation model. The fair value of commodity derivatives has been calculated using quoted market prices where available. In the absence of quoted market prices, third-party broker quotes or other valuation techniques have been used. The fair value of options has been calculated using the Black-Scholes pricing model. Credit risk has been taken into consideration when calculating the fair value of derivative instruments.

In some cases, even though the derivatives are considered to be effective economic hedges, they do not meet the specific criteria for hedge accounting treatment or are not designated as a hedge and are accounted for at fair value with changes in fair value recorded in net income in the period of change. This may expose the Company to increased variability in reported earnings because the fair value of the derivative instruments can fluctuate significantly from period to period.

Balance sheet presentation of derivative instruments

The balance sheet classification of the fair value of the derivative instruments as at September 30, 2017 is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                                  Total Fair
at September 30, 2017        Cash    Fair        Net                Value of
(unaudited - millions of     Flow   Value Investment Held for     Derivative
 Canadian $)               Hedges  Hedges     Hedges  Trading Instruments(1)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Other current assets
  Commodities(2)               4       -          -      196            200
  Foreign exchange             -       -          2       81             83
  Interest rate                2       -          -        1              3
----------------------------------------------------------------------------
                               6       -          2      278            286
Intangible and other
 assets
  Commodities(2)               1       -          -       88             89
  Foreign exchange             -       -          -        -              -
----------------------------------------------------------------------------
                               1       -          -       88             89
----------------------------------------------------------------------------
Total Derivative Assets        7       -          2      366            375
----------------------------------------------------------------------------
Accounts payable and
 other
  Commodities(2)              (1)      -          -     (249)          (250)
  Foreign exchange             -       -       (181)     (20)          (201)
  Interest rate                -      (2)         -        -             (2)
----------------------------------------------------------------------------
                              (1)     (2)      (181)    (269)          (453)
Other long-term
 liabilities
  Commodities(2)              (1)      -          -     (110)          (111)
  Foreign exchange             -       -        (43)       -            (43)
  Interest rate                -      (1)         -        -             (1)
----------------------------------------------------------------------------
                              (1)     (1)       (43)    (110)          (155)
----------------------------------------------------------------------------
Total Derivative
 Liabilities                  (2)     (3)      (224)    (379)          (608)
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Total Derivatives              5      (3)      (222)     (13)          (233)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Fair value equals carrying value.
(2) Includes purchases and sales of power, natural gas and liquids.

The balance sheet classification of the fair value of the derivative instruments as at December 31, 2016 is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                                                  Total Fair
at December 31, 2016         Cash    Fair        Net                Value of
(unaudited - millions of     Flow   Value Investment Held for     Derivative
 Canadian $)               Hedges  Hedges     Hedges  Trading Instruments(1)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Other current assets
  Commodities(2)               6       -          -      351            357
  Foreign exchange             -       -          6       10             16
  Interest rate                1       1          -        1              3
----------------------------------------------------------------------------
                               7       1          6      362            376
Intangible and other
 assets
  Commodities(2)               4       -          -      118            122
  Foreign exchange             -       -         10        -             10
  Interest rate                1       -          -        -              1
----------------------------------------------------------------------------
                               5       -         10      118            133
----------------------------------------------------------------------------
Total Derivative Assets       12       1         16      480            509
----------------------------------------------------------------------------
Accounts payable and
 other
  Commodities(2)               -       -          -     (330)          (330)
  Foreign exchange             -       -       (237)     (38)          (275)
  Interest rate               (1)     (1)         -        -             (2)
----------------------------------------------------------------------------
                              (1)     (1)      (237)    (368)          (607)
Other long-term
 liabilities
  Commodities(2)               -       -          -     (118)          (118)
  Foreign exchange             -       -       (211)       -           (211)
  Interest rate                -      (1)         -        -             (1)
----------------------------------------------------------------------------
                               -      (1)      (211)    (118)          (330)
----------------------------------------------------------------------------
Total Derivative
 Liabilities                  (1)     (2)      (448)    (486)          (937)
----------------------------------------------------------------------------

----------------------------------------------------------------------------
Total Derivatives             11      (1)      (432)      (6)          (428)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Fair value equals carrying value.
(2) Includes purchases and sales of power, natural gas and liquids.

The majority of derivative instruments held for trading have been entered into for risk management purposes and all are subject to the Company's risk management strategies, policies and limits. These include derivatives that have not been designated as hedges or do not qualify for hedge accounting treatment but have been entered into as economic hedges to manage the Company's exposures to market risk.

Notional and Maturity Summary

The maturity and notional principal or quantity outstanding related to the Company's derivative instruments excluding hedges of the net investment in foreign operations is as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
at September 30, 2017                    Natural           Foreign
(unaudited)                      Power       Gas Liquids  Exchange  Interest
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Purchases(1)                    83,491       159       8         -         -
Sales(1)                        53,727       152      10         -         -
Millions of U.S. dollars             -         -       -  US 3,072  US 1,550
Millions of Mexican pesos            -         -       -   MXN 100         -
Maturity dates               2017-2022 2017-2020    2017 2017-2018 2017-2019
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Volumes for power, natural gas and liquids derivatives are in GWh, Bcf
    and MMBbls, respectively.

----------------------------------------------------------------------------
----------------------------------------------------------------------------
at December 31, 2016                     Natural           Foreign
(unaudited)                      Power       Gas Liquids  Exchange  Interest
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Purchases(1)                    86,887       182       6         -         -
Sales(1)                        58,561       147       6         -         -
Millions of U.S. dollars             -         -       -  US 2,394  US 1,550
Maturity dates               2017-2021 2017-2020    2017      2017 2017-2019
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Volumes for power, natural gas and liquids derivatives are in GWh, Bcf
    and MMBbls, respectively.

Unrealized and Realized Gains/(Losses) on Derivative Instruments

The following summary does not include hedges of the net investment in foreign operations.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                 three months ended      nine months ended
                                    September 30           September 30
                               ---------------------- ----------------------
(unaudited - millions of
 Canadian $)                          2017       2016        2017       2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Derivative instruments held for
 trading(1)
Amount of unrealized
 gains/(losses) in the period
  Commodities(2)                       45        (97)       (102)        23
  Foreign exchange                     33          -          89         47
  Interest rate                        (1)         -          (1)         -
Amount of realized
 (losses)/gains in the period
  Commodities                         (82)       (23)       (167)      (165)
  Foreign exchange                     19         (5)         10         52
  Interest rate                         1          -           1          -
Derivative instruments in
 hedging relationships
Amount of realized
 gains/(losses) in the period
  Commodities                           4        (15)         17       (155)
  Foreign exchange                      -          5           5       (101)
  Interest rate                         -          1           1          4
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Realized and unrealized gains and losses on held for trading derivative
    instruments used to purchase and sell commodities are included net in
    Revenues. Realized and unrealized gains and losses on interest rate and
    foreign exchange derivative instruments held for trading are included
    net in Interest expense and Interest income and other, respectively.
(2) In the three and nine months ended September 30, 2017, there were no
    gains or losses included in Net Income relating to discontinued cash
    flow hedges where it was probable that the anticipated transaction would
    not occur (2016 - nil and a net loss of $42 million, respectively).

Derivatives in cash flow hedging relationships

The components of OCI (Note 9) related to derivatives in cash flow hedging relationships including the portion attributable to non-controlling interests are as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                     three months ended   nine months ended
                                        September 30        September 30
                                    ----------------------------------------
(unaudited - millions of Canadian $,
 pre-tax)                                 2017      2016      2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Change in fair value of derivative
 instruments recognized in OCI
 (effective portion)(1)
  Commodities                               2         7         5        33
  Foreign exchange                          -        (5)        -         -
  Interest rate                            (1)        4         -         -
----------------------------------------------------------------------------
                                            1         6         5        33
----------------------------------------------------------------------------
Reclassification of (losses)/gains
 on derivative instruments from AOCI
 to net income (effective
 portion)(1)
  Commodities(2)                           (4)       (7)      (15)       54
  Foreign exchange(3)                       -         5         -         -
  Interest rate(4)                          4         3        13        11
----------------------------------------------------------------------------
                                            -         1        (2)       65
----------------------------------------------------------------------------
Gains/(losses) on derivative
 instruments recognized in net
 income (ineffective portion)
  Commodities(2)                            -        14         -        (1)
----------------------------------------------------------------------------
                                            -        14         -        (1)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) No amounts have been excluded from the assessment of hedge
    effectiveness. Amounts in parentheses indicate losses recorded to OCI
    and AOCI.
(2) Reported within Revenues on the condensed consolidated statement of
    income.
(3) Reported within Interest income and other on the condensed consolidated
    statement of income.
(4) Reported within Interest expense on the condensed consolidated statement
    of income.

Offsetting of derivative instruments

The Company enters into derivative contracts with the right to offset in the normal course of business as well as in the event of default. TransCanada has no master netting agreements, however, similar contracts are entered into containing rights to offset. The Company has elected to present the fair value of derivative instruments with the right to offset on a gross basis in the balance sheet. The following table shows the impact on the presentation of the fair value of derivative instrument assets and liabilities had the Company elected to present these contracts on a net basis:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                   Gross derivative
at September 30, 2017                   instruments        Amounts
(unaudited - millions of           presented on the  available for       Net
 Canadian $)                          balance sheet      offset(1)   amounts
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Derivative - Asset
 Commodities                                   289           (220)       69
 Foreign exchange                               83            (63)       20
 Interest rate                                   3             (1)        2
----------------------------------------------------------------------------
Total                                          375           (284)       91
----------------------------------------------------------------------------
Derivative - Liability
 Commodities                                  (361)           220      (141)
 Foreign exchange                             (244)            63      (181)
 Interest rate                                  (3)             1        (2)
----------------------------------------------------------------------------
Total                                         (608)           284      (324)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Amounts available for offset do not include cash collateral pledged or
    received.

The following table shows the impact on the presentation of the fair value of derivative instrument assets and liabilities had the Company elected to present these contracts on a net basis as at December 31, 2016:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                   Gross derivative
at December 31, 2016                    instruments        Amounts
(unaudited - millions of           presented on the  available for       Net
 Canadian $)                          balance sheet      offset(1)   amounts
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Derivative - Asset
 Commodities                                   479           (362)      117
 Foreign exchange                               26            (26)        -
 Interest rate                                   4             (1)        3
----------------------------------------------------------------------------
Total                                          509           (389)      120
----------------------------------------------------------------------------
Derivative - Liability
 Commodities                                  (448)           362       (86)
 Foreign exchange                             (486)            26      (460)
 Interest rate                                  (3)             1        (2)
----------------------------------------------------------------------------
Total                                         (937)           389      (548)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) Amounts available for offset do not include cash collateral pledged or
    received.

With respect to the derivative instruments presented above as at September 30, 2017, the Company provided cash collateral of $230 million (December 31, 2016 - $305 million) and letters of credit of $22 million (December 31, 2016 - $27 million) to its counterparties. The Company held nil (December 31, 2016 - nil) in cash collateral and $3 million (December 31, 2016 - $3 million) in letters of credit from counterparties on asset exposures at September 30, 2017.

Credit risk related contingent features of derivative instruments

Derivative contracts entered into to manage market risk often contain financial assurance provisions that allow parties to the contracts to manage credit risk. These provisions may require collateral to be provided if a credit-risk-related contingent event occurs, such as a downgrade in the Company's credit rating to non-investment grade.

Based on contracts in place and market prices at September 30, 2017, the aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a net liability position was $11 million (December 31, 2016 - $19 million), for which the Company had provided collateral in the normal course of business of nil (December 31, 2016 - nil). If the credit-risk-related contingent features in these agreements were triggered on September 30, 2017, the Company would have been required to provide additional collateral of $11 million (December 31, 2016 - $19 million) to its counterparties. Collateral may also need to be provided should the fair value of derivative instruments exceed pre-defined contractual exposure limit thresholds.

The Company has sufficient liquidity in the form of cash and undrawn committed revolving credit facilities to meet these contingent obligations should they arise.

FAIR VALUE HIERARCHY

The Company's financial assets and liabilities recorded at fair value have been categorized into three categories based on a fair value hierarchy.


----------------------------------------------------------------------------
----------------------------------------------------------------------------
Levels    How fair value has been determined
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Level I   Quoted prices in active markets for identical assets and
          liabilities that the Company has the ability to access at the
          measurement date.
----------------------------------------------------------------------------
Level II  Valuation based on the extrapolation of inputs, other than quoted
          prices included within Level I, for which all significant inputs
          are observable directly or indirectly.

          Inputs include published exchange rates, interest rates, interest
          rate swap curves, yield curves and broker quotes from external
          data service providers.

          This category includes interest rate and foreign exchange
          derivative assets and liabilities where fair value is determined
          using the income approach and commodity derivatives where fair
          value is determined using the market approach.

          Transfers between Level I and Level II would occur when there is a
          change in market circumstances.
----------------------------------------------------------------------------
Level III Valuation of assets and liabilities are measured using a market
          approach based on extrapolation of inputs that are unobservable or
          where observable data does not support a significant portion of
          the derivative's fair value. This category mainly includes long-
          dated commodity transactions in certain markets where liquidity is
          low and the Company uses the most observable inputs available or,
          if not available, long-term broker quotes to estimate the fair
          value for these transactions. Valuation of options is based on the
          Black-Scholes pricing model.

          Assets and liabilities measured at fair value can fluctuate
          between Level II and Level III depending on the proportion of the
          value of the contract that extends beyond the time frame for which
          significant inputs are considered to be observable. As contracts
          near maturity and observable market data become available, they
          are transferred out of Level III and into Level II.
----------------------------------------------------------------------------
----------------------------------------------------------------------------

The fair value of the Company's derivative assets and liabilities measured on a recurring basis, including both current and non-current portions for at September 30, 2017, are categorized as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                            Significant
                           Quoted prices          other    Significant
at September 30, 2017          in active     observable   unobservable
(unaudited - millions of         markets         inputs         inputs
 Canadian $)                (Level I)(1)  (Level II)(1) (Level III)(1) Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Derivative instrument
 assets:
 Commodities                         30            240             19   289
 Foreign exchange                     -             83              -    83
 Interest rate                        -              3              -     3
Derivative instrument
 liabilities:
 Commodities                        (36)          (304)           (21) (361)
 Foreign exchange                     -           (244)             -  (244)
 Interest rate                        -             (3)             -    (3)
----------------------------------------------------------------------------
                                     (6)          (225)            (2) (233)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) There were no transfers from Level I to Level II or from Level II to
    Level III for the nine months ended September 30, 2017.

The fair value of the Company's derivative assets and liabilities measured on a recurring basis, including both current and non-current portions at December 31, 2016, were categorized as follows:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                            Significant
                           Quoted prices          other   Significant
at December 31, 2016           in active     observable   unobservable
(unaudited - millions of  markets (Level         inputs         inputs
 Canadian $)                       I)(1)  (Level II)(1) (Level III)(1) Total
----------------------------------------------------------------------------
----------------------------------------------------------------------------

Derivative instrument
 assets:
 Commodities                        134            326             19   479
 Foreign exchange                     -             26              -    26
 Interest rate                        -              4              -     4
Derivative instrument
 liabilities:
 Commodities                       (102)          (343)            (3) (448)
 Foreign exchange                     -           (486)             -  (486)
 Interest rate                        -             (3)             -    (3)
----------------------------------------------------------------------------
                                     32           (476)            16  (428)
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) There were no transfers from Level I to Level II or from Level II to
    Level III for the year ended December 31, 2016.

The following table presents the net change in fair value of derivative assets and liabilities classified as Level III of the fair value hierarchy:


----------------------------------------------------------------------------
----------------------------------------------------------------------------
                                     three months ended   nine months ended
                                        September 30        September 30
                                    ----------------------------------------
(unaudited - millions of Canadian $)      2017      2016      2017      2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Balance at beginning of period              9        12        16         9
Total (losses)/gains included in net
 income                                   (10)        2       (12)       13
Settlements                                (1)        1         4        (1)
Sales                                       -         -        (5)       (2)
Transfers out of Level III                  -        (3)       (5)       (6)
Total losses included in OCI                -         -         -        (1)
----------------------------------------------------------------------------
Balance at end of period(1)                (2)       12        (2)       12
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(1) For the three and nine months ended September 30, 2017, revenues include
    unrealized losses of $10 million and $14 million, respectively,
    attributed to derivatives in the Level III category that were still held
    at September 30, 2017 (2016 - gains of $1 million and $3 million,
    respectively).

A 10 per cent increase or decrease in commodity prices, with all other variables held constant, would result in a $2 million decrease or $1 million increase, respectively, in the fair value of outstanding derivative instruments included in Level III as at September 30, 2017.

12. Acquisitions & Dispositions

Mexico Natural Gas Pipelines

TransGas

In third quarter 2017, TransCanada recognized an impairment charge of $12 million on its 46.5 per cent equity investment in TransGas de Occidente S.A. (TransGas). TransGas constructed and operated a natural gas pipeline in Colombia for a 20-year contract term. As per the terms of the agreement, upon completion of the 20-year contract in August 2017, TransGas transfered its pipeline assets to Transportadora de Gas Internacional S.A.. The impairment charge represents the write-down of the remaining carrying value of the equity investment. The non-cash impairment charge was recognized in Income from equity investments in the condensed consolidated statement of income.

Canadian Natural Gas Pipelines

Prince Rupert Gas Transmission

In July 2017, the Company was notified that PNW LNG would not be proceeding with their proposed LNG project and that Progress Energy (Progress) would be terminating their agreement with TransCanada for development of the PRGT project effective August 10, 2017. In accordance with the terms of the agreement, all project costs incurred to advance the project, including carrying charges, are fully recoverable upon termination. At September 30, 2017, the expected reimbursement of project costs, previously recorded in Intangibles and other assets on the Company's condensed consolidated balance sheet, was included in Accounts receivable. In October 2017, the Company received full payment of the $0.6 billion reimbursement from Progress.

U.S. Natural Gas Pipelines

Iroquois Gas Transmission System and Portland Natural Gas Transmission System

On June 1, 2017, TransCanada completed the sale of its 49.34 per cent interest in Iroquois and its remaining 11.81 per cent interest in PNGTS to TC PipeLines LP, valued at US$765 million. Proceeds were comprised of US$597 million in cash and US$168 million representing a proportionate share of Iroquois and PNGTS debt.

Columbia Pipeline Group

In second quarter 2017, the Company completed its procedures over measuring the volume of base gas acquired as part of the acquisition of Columbia. As a result, the Company decreased the fair value of base gas by $116 million (US$90 million). This impacted the purchase price equation by decreasing property, plant and equipment by $116 million (US$90 million), decreasing deferred tax liabilities by $45 million (US$35 million) and increasing goodwill by $71 million (US$55 million). This adjustment did not impact the Company's net income.

Energy

U.S. Northeast Power Assets

On June 2, 2017, TransCanada completed the sale of Ravenswood, Ironwood, Kibby Wind and Ocean State Power for proceeds of approximately US$2.029 billion, subject to post-closing adjustments. In 2016, the Company recorded a loss of approximately $829 million ($863 million after tax) which included the impact of an estimated $70 million of foreign currency translation gains. The Company recorded an additional loss on sale of $226 million ($183 million after tax) in the nine months ended September 30, 2017, of which $7 million ($7 million after tax) was recorded in the third quarter. The 2017 loss included $2 million in foreign currency translation gains. These additional losses primarily related to adjustments to the purchase price and repair costs for an unplanned outage at Ravenswood prior to close. The actual foreign currency translation gains of $72 million were reclassified from AOCI to Net income on closing of the transaction.

On April 19, 2017, the Company completed the sale of TC Hydro for gross proceeds of US$1.07 billion, subject to post-closing adjustments. As a result, in the nine months ended September 30, 2017, the Company recorded a gain on sale of approximately $715 million ($440 million after tax) including the impact of an estimated $5 million of foreign currency translation gains which were reclassified from AOCI to net income. The gain on sale included an adjustment of $2 million ($1 million after tax) that was recorded in the third quarter.

Gains and losses from these sales are included in (Loss)/gain on sale of assets in the condensed consolidated statement of income. The proceeds received from the sale of the U.S. Northeast Power assets were used to fully repay the outstanding balances on the Company's acquisition bridge facilities that partially funded the acquisition of Columbia.

13. Commitments, contingencies and guarantees

COMMITMENTS

TransCanada's operating lease commitments at December 31, 2016 included future payments related to our U.S. Northeast power assets. As a result of the completion of the thermal power asset sale on June 2, 2017, the remaining future obligations reported at December 31, 2016 have decreased by: $2 million in 2017, $52 million in 2018, $34 million in 2019 and $102 million in 2022 and beyond.

CONTINGENCIES

TransCanada and its subsidiaries are subject to various legal proceedings, arbitrations and actions arising in the normal course of business. While the final outcome of such legal proceedings and actions cannot be predicted with certainty, it is the opinion of management that the resolution of such proceedings and actions will not have a material impact on the Company's consolidated financial position or results of operations.

In March 2017, the U.S. Department of State issued a U.S. Presidential Permit authorizing construction of the U.S./Canada border crossing facilities of the Keystone XL pipeline. TransCanada discontinued the claim under Chapter 11 of the North American Free Trade Agreement and has also withdrawn the U.S. Constitutional challenge.

GUARANTEES

TransCanada and its partner on the Sur de Texas pipeline, IEnova, have jointly guaranteed the obligations for construction services during the construction of the pipeline.

TransCanada and its joint venture partner on Bruce Power, BPC Generation Infrastructure Trust, have each severally guaranteed certain contingent financial obligations of Bruce Power related to a lease agreement and contractor and supplier services.

The Company and its partners in certain other jointly owned entities have either (i) jointly and severally, (ii) jointly or (iii) severally guaranteed the financial performance of these entities. Such agreements include guarantees and letters of credit which are primarily related to delivery of natural gas, construction services and the payment of liabilities. For certain of these entities, any payments made by TransCanada under these guarantees in excess of its ownership interest are to be reimbursed by its partners.

The carrying value of these guarantees has been included in other long-term liabilities. Information regarding the Company's guarantees is as follows:


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                                  at September 30, 2017 at December 31, 2016
                                 ---------------------- --------------------
(unaudited -
 millions of                       Potential   Carrying   Potential Carrying
 Canadian $)                 Term exposure(1)     value  exposure(1)   value
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Sur de Texas      ranging to 2020         397         4          805      53
Bruce Power       ranging to 2018          88         1           88       1
Other jointly
 owned entities   ranging to 2059         105        14           87      28
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                                          590        19          980      82
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(1) TransCanada's share of the potential estimated current or contingent
    exposure.

14. Variable interest entities

The Company consolidates a number of entities that are considered to be VIEs. A VIE is a legal entity that does not have sufficient equity at risk to finance its activities without additional subordinated financial support or is structured such that equity investors lack the ability to make significant decisions relating to the entity's operations through voting rights or do not substantively participate in the gains and losses of the entity.

In the normal course of business, the Company consolidates VIEs in which it has a variable interest and for which it is considered to be the primary beneficiary. VIEs in which the Company has a variable interest but is not the primary beneficiary are considered non-consolidated VIEs and are accounted for as equity investments.

Consolidated VIEs

The Company's consolidated VIEs consist of legal entities where the Company has the power, through voting or similar rights, to direct the activities of the VIE that most significantly impact economic performance including purchasing or selling significant assets; maintenance and operations of assets; incurring additional indebtedness; or determining the strategic operating direction of the entity. In addition, the Company has the obligation to absorb losses or the right to receive benefits from the consolidated VIE that could potentially be significant to the VIE.

A significant portion of the Company's assets are held through VIEs in which the Company holds a 100 per cent voting interest, the VIE meets the definition of a business and the VIE's assets can be used for general corporate purposes. The assets and liabilities of the consolidated VIEs whose assets cannot be used for purposes other than the settlement of the VIE's obligations are as follows:


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                                                September 30,   December 31,
(unaudited - millions of Canadian $)                     2017           2016
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ASSETS
Current Assets
Cash and cash equivalents                                  91             77
Accounts receivable                                        56             71
Inventories                                                22             25
Other                                                       8             10
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                                                          177            183
Plant, Property and Equipment                           3,552          3,685
Equity Investments                                        923            606
Goodwill                                                  489            525
Intangible and Other Assets                                 -              1
----------------------------------------------------------------------------
                                                        5,141          5,000
----------------------------------------------------------------------------
LIABILITIES
Current Liabilities
Accounts payable and other                                 80             80
Accrued interest                                           30             21
Current portion of long-term debt                          87             76
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                                                          197            177
Regulatory Liabilities                                     33             34
Other Long-Term Liabilities                                 3              4
Deferred Income Tax Liabilities                            13              7
Long-Term Debt                                          3,349          2,827
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                                                        3,595          3,049
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----------------------------------------------------------------------------

Non-Consolidated VIEs

The Company's non-consolidated VIEs consist of legal entities where the Company does not have the power to direct the activities that most significantly impact the economic performance of these entities or where this power is shared with third parties. The Company contributes capital to these VIEs and receives ownership interests that provide it with residual claims on assets after liabilities are paid.

The carrying value of these VIEs and the maximum exposure to loss as a result of the Company's involvement with these VIEs are as follows:


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----------------------------------------------------------------------------
                                                September 30,   December 31,
(unaudited - millions of Canadian $)                     2017           2016
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Balance sheet
  Equity investments                                    4,409          4,964
Off-balance sheet
  Potential exposure to guarantees                        171            163
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Maximum exposure to loss                                4,580          5,127
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15. Subsequent event

Energy East and Related Projects

On October 5, 2017, the Company concluded a review process of the Energy East, Eastern Mainline and Upland projects and informed the NEB that it will not proceed with the projects. At September 30, 2017, approximately $1.3 billion related to these projects, including AFUDC, was recorded in Intangible and other assets on the Company's condensed consolidated balance sheet. Due to the project's inability to reach a regulatory decision, no recoveries of costs from third parties are expected, and the Company will record an approximate $1.0 billion after-tax non-cash impairment charge in fourth quarter 2017.

Contacts:
TransCanada Media Enquiries:
Mark Cooper/Grady Semmens
403.920.7859 or 800.608.7859

TransCanada Investor & Analyst Enquiries:
David Moneta/Stuart Kampel
403.920.7911 or 800.361.6522

Source: TRANSCANADA

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