The Russian-occupied Zaporizhzhya Nuclear Power Plant in Ukraine has once again lost its external power supply, according to the International Atomic Energy Agency (IAEA).
A 330-kilovolt power line was likely damaged on the northern bank of the Dnipro river, the UN's nuclear watchdog said on X. An attempt to reconnect the line was unsuccessful.
Due to ongoing military activity, technicians were not immediately able to determine the cause of the damage, the agency said.
Diesel generators started automatically and were supplying the plant's essential safety systems. The IAEA team stationed at the facility was continuing to assess the situation.
IAEA Director General Rafael Grossi warned of the "extremely fragile" nuclear safety situation, urging the warring parties to exercise maximum restraint and protect the plant's external power supply.
The Zaporizhzhya plant, with six reactors, is Europe's largest nuclear power station.
It came under Russian control shortly after Russia launched its war against Ukraine in February 2022 and has since repeatedly come under fire.
Its reactors are shut down but still require cooling, leaving the plant dependent on external power lines or diesel generators to maintain essential safety functions.