Record ocean heat threatens Sweden's nuclear power and climate plan
Rising sea temperatures are forcing nuclear reactors across Europe, including Sweden, to cut output or shut down, challenging the country's climate-energy strategy.
Jane Lubchenco, former NOAA chief, said that unusually warm ocean water disrupts climate patterns and threatens global food security. NOAA reports sea-surface temperatures have set records for four consecutive months, with September hotter than any previous September, and a strong El Niño developing in the Pacific. The heat wave has already forced reactors in France, Hungary and Romania to limit generation or shut down, and Sweden’s Ringhals 2 was halted in August 2018 when water reached 25 °C, the maximum allowed for cooling.
Sweden’s climate-environment minister Romina Pourmokhtari maintains nuclear power is essential for the climate transition, yet the Climate Policy Council criticises the focus on nuclear as insufficient. The Swedish Radiation Safety Authority notes reactors reduce output once cooling water exceeds 20 °C and may shut down between 20-30 °C, but exact thresholds are not disclosed. Studies are underway to gauge long-term effects of rising sea temperatures on future plant designs, but no comprehensive analysis is finished yet.
Why it matters
Hot sea water could limit nuclear output, undermining Sweden's climate goals and energy security.
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