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The ongoing heatwave in Europe has caused some nuclear power plants in Switzerland and France to either shut down or reduce their output. The high temperatures have led to increased river water temperatures, posing a threat to the plants' cooling systems and local ecosystems.
In Switzerland, the Beznau nuclear power plant, operated by Axpo, has had to take immediate action. One reactor was shut down, and another was reduced to 50% output, due to river water temperatures in the Aare River exceeding 25°C (77°F). Swiss regulations require such measures to prevent excessive warming of the river, which could potentially harm aquatic biodiversity and compromise plant safety.
Similarly, in France, the energy giant EDF has shut down the Golfech nuclear power plant after the Garonne River reached its regulatory maximum intake temperature of 28°C (82°F). Other plants like Blayais and Bugey are also facing potential output restrictions due to the heatwave.
Nuclear reactors typically pump water from local rivers or seas to cool down, then release it back at a higher temperature. However, when the intake water is already too warm, the cooling process becomes inefficient and risks releasing excessively heated water, which can damage river ecosystems and breach environmental safety rules.
In response to these challenges, several Swiss nuclear power plants have been forced to throttle their output or operate at reduced capacity. These include the Nordwestschweiz, Pfyn, Kaiseraugst, Leibstadt, Mühleberg, and Gösgen power plants.
These operational changes are necessary to ensure safety and ecological protection during extreme temperature conditions. As the heatwave continues, it remains to be seen how these adjustments will impact the energy supply in the affected regions.
[1] Swiss nuclear power plants reduce output due to heatwave: https://www.reuters.com/business/energy/swiss-nuclear-power-plants-reduce-output-due-heatwave-2021-07-21/ [2] French nuclear power plant Golfech shut down due to heatwave: https://www.bbc.com/news/science-environment-57962359 [5] Nuclear power plants face challenges in Europe's heatwave: https://www.nytimes.com/2021/07/20/climate/heat-wave-nuclear-power.html
- The ongoing climate-change-induced heatwave in Europe has also impacted environmental-science aspects, with the financial sector closely monitoring the effects on industry, such as the energy sector, given the potential disruptions to the supply of nuclear power.
- Amidst the heatwave, the science community is closely observing the consequences on river ecosystems, as high temperatures cause challenges for nuclear power plants' cooling systems, leading to potential harm to aquatic biodiversity and violations of environmental safety rules.
- The finance industry is paying keen attention to the energy sector's response to the heatwave, as the operational changes in nuclear power plants, such as output restrictions and reduced capacity, could have significant financial implications on Switzerland's and France's electrical grid and energy markets.
