Electricite de France SA’s Tricastin nuclear plant in Saint-Paul-Trois-Chateaux, France. Photographer: Theo Giacometti/Bloomberg Output cuts at some French nuclear plants are expected to stretch into next week as a heatwave sweeping across Europe is pushes up temperatures on rivers in France, risking even higher power prices. In its latest warning, Electricite de France SA flagged that two plants on the Rhone river will produce less electricity in the next few days. Earlier this week, the embattled utility warned that hot temperatures on the Garonne river would curb output at another plant. Under France’s rules, EDF must reduce or halt nuclear output when river temperatures reach certain thresholds to ensure that the water used to cool the plants won’t harm the environment when put back into the waterways. The curbs are likely to strain the European power system even further. The utility has estimated that output this year will be […]