Moscow and Kyiv traded fresh accusations on Saturday of shelling around the Russian-controlled Zaporizhzhia nuclear power plant (NPP) in Ukraine.

Russia's Defense Ministry on Saturday accused Ukrainian forces of shelling the plant three times in the last 24 hours but said the radiation level at the plant remains normal, adding that the technical condition of the plant is monitored and maintained by staff technicians.

Ukraine's state nuclear company Energoatom, however, blamed Russia for the shelling and said there are risks of hydrogen leakage and sputtering of radioactive substances, and the fire hazard is high.

In a Telegram post, the Energoatom said that the damage is currently being ascertained. 

On Thursday, Energoatom said the Zaporizhzhia NPP was disconnected from the power grid for the first time in its history after fires at ash pits stopped the last power line from working.

Both Energoatom and Vladimir Rogov, a member of the main council of the Zaporizhzhia region's military-civilian administration on Saturday confirmed that the two power units of the Zaporizhzhia NPP were reconnected to the grid and are producing electricity to Ukraine.

The Zaporizhzhia NPP is one of Europe's largest nuclear power plants and generates a quarter of Ukraine's total electricity. It has been controlled by Russian forces since early March, but its Ukrainian staff has continued to operate it. In recent weeks, Ukraine and Russia have traded accusations of strikes on the facility.

(With input from agencies)