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France shuts three nuclear reactors as heatwave hits 26 million
On 12‑13 July 2026 France temporarily shut three nuclear reactors – at Golfech, Bugey and Chooz – and reduced output at eight others because river water used for cooling became too warm. EDF said the measures were required to comply with environmental limits on thermal discharges and to protect river ecosystems.
The shutdowns came amid the country’s third heatwave in two months. Météo‑France placed 37 mainland departments, covering about 26 million people (one‑third of the population), on the highest red heat‑wave alert, with temperatures forecast between 37 °C and 41 °C. The health ministry reported 139 drownings since 19 June and warned of rising mortality.
The loss of nuclear output, which normally supplies roughly 70 % of France’s electricity, pushed wholesale power prices above €180/MWh and raised concerns about potential supply shortages for France’s export markets. At the same time, a forest fire near Fontainebleau burned about 800 ha, adding further strain to emergency services.
Authorities activated an “Orsec extreme heat plan”, opening refreshment centres, deploying 100 million € for air‑conditioner installations in hospitals and nursing homes, and urging the public to stay hydrated, avoid the midday sun and check on vulnerable people.