Electricite de France SA’s nuclear-output cuts are expected to stretch into next week as a heat wave sweeping across Europe pushes up river temperatures, restricting EDF’s ability to cool its plants.

The French utility said that two power stations on the Rhone River will produce less electricity in the coming days, adding to cutbacks at another plant caused by rising temperatures on the Garonne.

France’s nuclear reactors were operating at 46% of capacity on Friday, down from 47% on Wednesday, according to Bloomberg calculations using data from grid operator RTE.

France Nuclear Power Production Cuts Stretch to Next Week Due to Heating Rivers – Bloomberg