欧洲持续的极端高温正在对核电站运营造成严重冲击。法国作为欧洲最依赖核电的国家，其核电厂通常供应该国40%的电力需求，但在今年夏季遭遇了显著的产能下降[1]。核反应堆约三分之一的热量转化为电力，其余需要通过冷却系统释放到环境中[1]，当冷却水温度升高或水位下降时，这一系统效率随之降低。
2026年6月至7月的热浪期间，法国核电可用容量遭受了明显的冲击[1]。6月24日，由于河流水温过高，法国核电容量下降约4.1吉瓦，导致该国电力出口从前周的10-12吉瓦急剧跌至约3吉瓦[1]。到7月中旬，情况更为严峻——8座反应堆（合计6.3吉瓦）受到影响，其中2座完全停机[1]。整个热浪期间，法国核电最大可用容量被临时限制在8-9吉瓦，相当于夏季核电容量的五分之一[1]。
历史数据显示，法国核反应堆因高水温和低水位造成的年度损失通常不超过年度核电生产的1%，即使在2003年极热夏季也仅约1.5%[1]。然而，短期波动对欧洲电力市场稳定性和电价的冲击仍不容忽视。展望未来，法国审计办公室预期到2050年气候相关的反应堆停运时间可能增加两倍到四倍[1]。
Europe's nuclear power plants face significant operational challenges as extreme heat waves strain cooling water supplies, with France bearing the brunt of the crisis.[1] Nuclear reactors typically provide 40% of France's electricity demand, yet the country's generating capacity has become increasingly vulnerable to temperature fluctuations.[1]
During heat waves in June and July 2026, France's available nuclear capacity was temporarily restricted by 8 to 9 gigawatts, equivalent to one-fifth of the nation's summer nuclear capacity.[1] On June 24, high river temperatures alone reduced capacity by approximately 4.1 gigawatts, causing French electricity exports to plummet from 10 to 12 gigawatts in the previous week to roughly 3 gigawatts.[1] By July 13, eight reactors totaling 6.3 gigawatts were affected, with two units completely shut down.[1] These fluctuations have exerted notable pressure on Europe's electricity market stability and power prices.
Historical data shows that annual production losses from high water temperatures and low water levels between 2000 and 2022 typically did not exceed 1% of annual nuclear output—reaching only about 1.5% even during the extreme 2003 summer.[1] France's 2003 heat wave caused temporary reductions exceeding 6 gigawatts in nuclear output.[1] Looking forward, France's audit office projects that climate-related reactor downtime could increase two to four times by 2050.[1] This concern stems from the fundamental physics of nuclear power: approximately one-third of reactor heat converts to electricity, with the remaining two-thirds released through cooling systems to the environment.[1]