French gas plant idles as Mediterranean heat strains power grid

France's energy infrastructure faces a double blow from climate change, with both its gas and nuclear power sectors struggling under extreme heat. The EDF gas plant in Martigues, with a capacity of 930 megawatts, was forced offline because rising Mediterranean water temperatures restricted its access to cooling water. This marks the first heat-related shutdown of a French gas plant since 2022, intensifying concerns over the nation's energy supply.

The situation is compounded by significant reductions in nuclear power output. Warm rivers have already curtailed 4.9 gigawatts of nuclear capacity, with an additional 2.5 gigawatts unavailable due to low water levels. These combined losses represent about 14% of the country's total nuclear generating capacity, which is crucial as nuclear power provides roughly 70% of France's electricity.

Thibault Laconde, founder of climate data analysis firm Callendar, noted the unprecedented nature of these "climate-driven outages," affecting reactors typically spared such issues. While the current heatwave is expected to subside, persistent drought continues to worsen across France, threatening further disruptions. The shutdown of the Martigues plant, though a gas facility, highlights the broader vulnerability of the energy grid to climate extremes.

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We have experienced two waves of climate-driven outages that were unprecedented in their scale and timing, affecting reactors that are normally spared.