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Heatwave and jellyfish influx into pump stations push French nuclear unit unavailability to 20.4%

The heatwave sweeping across multiple regions of France is impacting the country's electricity production. Several nuclear reactors operated by Électricité de France (EDF) have been shut down or derated due to environmental restrictions or external environmental factors, with the unavailability rate of affected units rising to 20.4% before 10:00 AM on August 12, marking a recent high. Of France's 57 nuclear reactors, 13 are currently affected. Among them, 8 units are fully shut down: Bugey Unit 3, Cattenom Unit 1, Chooz Units 1 and 2, Golfech Unit 2, and Gravelines Units 2, 3, and 4; another 5 units are operating below rated power, including Saint-Alban Unit 2, Tricastin Units 1 and 4...

2026-08-13

French nuclear fleet output drops to 59% of full capacity

On Wednesday, August 12, French nuclear reactors operated at 59% of full capacity, according to RTÉ grid data and Bloomberg calculations, down 1 percentage point from 60% on Tuesday, August 11. EDF, the world's largest nuclear power operator, currently has 34 reactors in operation with a total available capacity of 33,250 MW; France's 57 nuclear reactors normally supply more than two-thirds of the country's electricity. EDF recently halted power generation at the Gravelines 2 and Bugey 3 reactors, while extending the outage of the Gravelines 3 and 4 units and the Cattenom 4 reactor...

2026-08-13

France's drought lowers river water levels, EDF shuts down three nuclear reactors

Affected by drought weather, water flows in France's Meuse and Moselle rivers have declined, and Électricité de France (EDF) has shut down three nuclear reactors in northeastern France. As of the afternoon of August 3, Units 1 and 2 at the Chooz Nuclear Power Plant in the Ardennes department, as well as one unit at the Cattenom Nuclear Power Plant in the Moselle department, remained offline. EDF shut down Unit 1 at the Chooz plant on Saturday evening to comply with the Meuse River management agreement signed between France and Belgium in 1998. Under the same agreement, Unit 2 at the Chooz plant has been offline since July 11. EDF stated that the agreement allows for adjustments to power generation arrangements based on hydrological conditions to safeguard water usage for users along the Meuse River in both France and Belgium.

2026-08-05