Heatwave expected to limit 15% of France's nuclear fleet on Friday
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Paks Nuclear Power Plant is pictured as the construction begins on a riverbed sill to raise the Danube's water level in Dunaszentbenedek, Hungary, August 13, 2026. REUTERS/Bernadett Szabo
PARIS, Aug 13 (Reuters) - Europe's fifth heatwave this summer is expected to limit French nuclear power production by about 15% of the nuclear fleet's total capacity on Friday, with six reactors expected to be fully offline, data from operator EDF showed.
Temperatures in Europe have risen to unprecedented levels after successive heatwaves this summer, causing water shortages, wildfires, and some deaths.
Total nuclear curtailments are expected to reach 9.4 gigawatts at the peak on Friday across nine reactors, EDF data showed.
The low nuclear production paired with limited wind output lifted power prices, with the French day-ahead contract for Friday the highest since June 23, the previous peak this summer, up 4.4% at €154.50 ($178.08) per megawatt hour at 0756 GMT, LSEG data showed.
Power prices are traditionally much lower in August as it is a major holiday month in France, limiting power demand.
The nuclear shortfall also ripples across borders, forcing countries like Britain and Germany to turn on coal and gas plants to replace reduced exported nuclear power.
France relies on nuclear power for about 70% of its annual electricity production. French rules limit how much heat plants can discharge into rivers for environmental protection, forcing reactors to cut output when water temperatures rise during heatwaves.
Thursday is expected to be the peak of the current heatwave, with temperatures between 35 degrees Celsius (95 degrees Fahrenheit) and 40 C in most regions of the country, Meteo-France said.
Temperatures are expected to stay warm overnight, with some cooler air coming from the west and bringing relief on Friday to areas along the Atlantic and English Channel first, while the rest of the country remains warm, Meteo-France said.
Despite the continued outages, nuclear power production in France increased in June and July compared to the previous year as EDF has reworked its nuclear fleet maintenance schedule.
The jellyfish-hit nuclear reactors at the Gravelines plant in the north of the country have also returned to service.
($1 = 0.8676 euros)
(Reporting by Forrest Crellin; Editing by Sharon Singleton)
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