Heat surge triggers first major blackout in northwestern France, cutting 68,000 homes

A record-breaking heatwave knocked out power to approximately 68,000 households in northwestern France on Wednesday—the region's first major grid failure this season. The historically cooler zone has low air conditioning adoption, making sudden demand spikes harder for distribution infrastructure to absorb. France's nuclear fleet faces separate heat-driven constraints: reactor thermal discharges into rivers face regulatory limits when water temperatures rise, potentially forcing output cuts and tightening supplies across Europe's interconnected markets.