All six reactors of the Zaporizhzhia nuclear power plant in southern Ukraine are still disconnected from Ukraine's electricity grid, state nuclear company Energoatom said on Friday.

Energoatom said electricity for the plant's own needs was currently being supplied through a power line from Ukraine's electricity system, and that work was ongoing to restore grid connection to the plant's two functioning reactors.

Ukraine has begun trying to resume operations at two reactors at the plant, regional Governor Oleksandr Starukh later confirmed on Friday. 

The plant's sixth reactor is working at 10 percent capacity, while the fifth reactor is in the process of resuming operations, he said in televised comments.

A Russian-installed official in the Zaporizhzhia region claimed on Friday that Ukrainian forces had broken the final power line connecting the nuclear plant with Ukraine, Russia's TASS news agency reported. 

TASS quoted Vladimir Rogov, a member of the main council of the regional administration, as saying that the situation at the plant is under control, and the generated electricity is supplied to the "liberated territories" in the Zaporizhzhia and Kherson regions.

Ukraine has not responded to this claim.

(With input from Reuters)