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said Sunday the sixth and final reactor at the nuclear power station in the south of the country was no longer generating electricity.

"Today, September 11, 2022, at night, at 03:41 am (0141 GMT), unit No. 6 of the ZNPP was disconnected from the power grid. Preparations are underway for its cooling and transfer to a cold state," state nuclear agency Energoatom said in statement.

and its allies have been increasingly concerned about the safe operation of - the largest in Europe - and recent fighting there has raised fears of serious incident.

warned earlier this week that a blackout in the nearby town of Energodar had "compromised the safe operation" of the nuclear facility.

Energoatom said Sunday that a cold shutdown was the "safest state" for the reactor.

Energoatom said that the sixth reactor had been generating energy for the plant itself for three days and that the decision to halt its operations came when external power had been restored to the facility.

"In case of repeated damage to the transmission lines linking the facility to - the risk of which remains high - the (plant's) in-house needs will be powered by diesel generators," it cautioned in a statement.

Energoatom in its statement again called for the establishment of a demilitarised zone around the plant, saying it was the only way to sure plant's safety.