"With the plan now presented, the most important question will be to examine whether and how it is technically and organisationally feasible, because nuclear power plants in their technical design are not reserve power plants that can be variably switched on and off," it said.

E.ON had said prior to the request it was theoretically and technically able to keep the plant intact, but the ball regarding conditions was in the government's court.

(Reporting by Vera Eckert, editing by Sarah Marsh)