Ukraine’s Zaporizhzhia nuclear power station has taken action to ensure an immediate supply of backup electricity in case its main external power line is lost, amid warnings from the International Atomic Energy Agency that its inspectors had been denied access to parts of the Russian-occupied facility.

The IAEA said frequent power cuts have remained a source of serious concern for safety and security at Europe’s largest nuclear power station, which needs electricity to cool its reactors and for other essential functions, even when all reactor units have been shut down.

Since August 2022, the six-unit station in southeastern Ukraine has suffered eight events with a complete loss of offsite power, the IAEA said.