As fighting rages in the area, the Zaporizhzhia nuclear power plant has been completely shut down.
The plant is one of the largest in the world and the largest in Europe and has been occupied by Russian forces. The Ukrainian staff still operates it.
The agency disconnected the last operational reactor from the grid, which caused the plant to stop operating.
The statement said that preparations were underway for its cooling and transfer.
Fears of a potential nuclear disaster have arisen due to the constant shelling of the plant by Russia and Ukraine.
The UN Secretary-General has said that attacks around the plant are suicidal.
According to the UN's International Atomic Energy Agency, fighting near the plant may lead to radiological consequences.
Due to fighting in the area, the plant became disconnected from the power grid and had to use its only remaining reactor for cooling operations.
The final reactor was shut down due to the fact that one of the power lines was restored.
The company decided to shut down power unit No. 6 and transfer it to the safest state.
The plant would need to use diesel generators to keep the reactor cool if power were cut again.
According to the agency's chief, the plant only had enough diesel for 10 days.
A demilitarized zone around the plant has been called for by the UN and the Ukrainian president.
Zelenskyy said on Saturday that he wanted the plant to be stable so that it could help with Europe's energy crisis.