Form 424B3 DOMINION ENERGY, INC

Registration No. 333-295605

Filed Pursuant to Rule 424(b)(3)

DOMINION ENERGY, INC.

DOMINION ENERGY RELIABILITY INVESTMENT^®

VARIABLE DENOMINATION FLOATING RATE DEMAND NOTES

PRICING SUPPLEMENT

(To Prospectus dated May 6, 2026)

The Date of this Pricing Supplement is September 17, 2026

The Dominion Energy Reliability Investment Variable Denomination Floating Rate Demand Notes (the “Notes”) bear interest at a floating rate per annum determined by the Dominion Energy Reliability Investment Committee on a weekly basis to be effective on Monday of the week following such determination.

The current Prospectus for the Notes was filed with the Securities and Exchange Commission on May 6, 2026. The interest rate established for the Notes as of September 21, 2026, and set forth below, remains in effect until further notice.