A view shows the Zaporizhzhia Nuclear Power Plant from the bank of Kakhovka Reservoir near the town of Nikopol amid Russia's attack on Ukraine, in the Dnipropetrovsk region, Ukraine, 16 June 2023; Credit: Reuters/Alina Smutko

VIENNA (Reuters) - All external power lines supplying electricity to the Russian-occupied Zaporizhzhia Nuclear Power Plant in Ukraine were down for several hours on Friday 4 July 2025, the United Nations (UN) nuclear watchdog said, but the station's management later said power had been restored.

The head of the International Atomic Energy Agency, Rafael Grossi, acknowledged that power had been restored after three and a half hours. But he added in a statement on X that nuclear safety "remains extremely precarious in Ukraine”.

Ukraine's energy minister blamed Russian shelling for severing the last power line to the plant and its six reactors. The country's power distribution operator said its technicians had taken action to restore it.

Europe's biggest nuclear power plant, which is not operating but still requires power to keep its nuclear fuel cool, switched during the outage to running on diesel generators, the IAEA said.