FRANKFURT (Reuters) - German utility Uniper said on Thursday it had applied to extend the closure of its loss-making Irsching 4 and 5 gas-fired power generation plants with a capacity of 1,400 megawatts (MW) for a third year beyond April 2019.

Uniper and the other owners of unit 5, N-Ergie, Mainova and HSE, see no way to ensure the plant's commercial viability, it said in a statement.

Likewise, Uniper as sole owner of Irsching 4 also wants to apply for temporary closure in the same period for the same reason, it said.

Due to competition from subsidised solar and wind energy, many German fossil fuels plants are running at a fraction of the time needed to be profitable.

The wish to idle plants against a fee needs signalling to the energy regulator with a notice period of 12 months in advance, in order to establish whether this poses a risk to the stability of power transport grids.

(Reporting by Vera Eckert, editing by Douglas Busvine)