The site, occupied by Russian forces since March 2022, lost its connection to the grid on September 23 for the 10th time and had been relying on backup diesel generators for crucial cooling functions.

The resumption of off-site power to the plant, after repairs on a line during a local ceasefire, is "a crucial step for nuclear safety and security", the UN nuclear watchdog said in a post on X.

The agency continues to work with Russia and Ukraine to enable restoration of another power line, it added.

The IAEA said last Saturday that work had started to repair the damaged power lines to the plant.

It had previously said repairs were needed on both sides of the front line, several kilometres from the plant, Europe's largest.

Located near the city of Enerhodar along the Dnieper River, the plant's six reactors, which produced about one-fifth of Ukraine's electricity before the war, were shut down after Moscow took control.

However, the plant needs electricity to maintain its cooling and safety systems to prevent a disaster.

At the beginning of October, Moscow claimed that the situation was "under control" in Zaporizhzhia following concerns raised by Ukrainian President Volodymyr Zelensky.

Moscow and Kyiv have repeatedly accused each other of risking a nuclear disaster by attacking the site and have blamed each other for the latest power outage.