Weather tracker: Unusually warm rivers affect French nuclear power plants

High temperatures and below average rainfall puts pressure on waterways used to cool reactors

Above average temperatures combined with below average rainfall across much of western and central Europe during June and the first half of July have placed increasing pressure on rivers, ecosystems and energy infrastructure. Persistent high pressure brought prolonged sunshine, suppressed rainfall and enhanced evaporation, causing river levels to fall and water temperatures to increase.

These unusually warm rivers are affecting electricity generation in France, as several nuclear power stations rely on river water for cooling. Under French environmental regulations, operators must limit the amount of heat discharged back into rivers, meaning electricity output may need to be reduced when water temperatures become too high.