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EDF Warns of Potential Nuclear Output Cuts as Heatwave Pushes River Temperatures Beyond Limits

River temperatures have exceeded thresholds risking forced output throttles at EDF sites including Saint-Alban, Golfech in early July.

Overview

  • EDF issued a June 24 alert that the Golfech nuclear plant may reduce output from July 2 due to high Garonne river temperatures.
  • A June 23 warning signaled possible production throttling at Saint-Alban from July 1 over elevated Rhône water temperatures following an initial June 19 alert for Bugey that led to no cuts.
  • French nuclear reactors depend on river cooling systems governed by strict temperature and flow limits designed to protect aquatic ecosystems.
  • Météo-France continues its orange heatwave alert for the Rhône and Isère departments as the summer heat intensifies.
  • Since 2000 environmental factors have trimmed annual nuclear output by about 0.3%, with losses reaching 1.43% during the 2003 heatwave, underscoring growing climate impacts.