The backup generators have never needed to run for so long, according to Ukrainian President Volodymyr Zelenskyy. Zelenskyy blamed Russian artillery for cutting the power line to the Zaporizhzhia plant, but Kremlin spokesman Dmitry Peskov said it was Ukrainian shelling. Ukraine has four nuclear plants, though Zaporizhzhia is the only one in Russian hands. “There is still a threat that if the system cooling the nuclear fuel is lost, an accident could happen,” he told The Associated Press. As Russia’s invasion churns across the Ukrainian countryside, the Zaporizhzhia facility has repeatedly been caught in the crossfire.