Sweden’s top nuclear power generators have been forced to cut output because of exceptionally warm weather in Scandinavia, and their output could be reduced for over a week, their operators said on Wednesday. Oskarshamn, part of Germany’s E.ON and Forsmark, operated by Swedish utility Vattenfall have both cut output because warm sea water temperatures are limiting their ability to cool down. For each degree above 23 decrees Celsius in the cooling water, each unit has to decrease power by 3 percent. If sea temperatures reach 26 degrees, block 3 has to be shut, while at 28 degrees, the other two have to be closed as well, a Vattenfall spokesman said. Sea temperatures are currently around 22-23 degrees, according to the Swedish weather service.
— source scientificamerican.com 2014