FRANKFURT, May 15 (Reuters) - RWE has not

received any indication from Berlin on when to expect crucial

details on a vital German power plant strategy, its finance

chief Michael Mueller said on Wednesday, adding he hoped that

would happen before the summer break.

Germany's government in February agreed plans to subsidise

10 gigawatts of gas power plants that can switch to hydrogen but

has so far failed to deliver details for the process that are

important for utilities to make investment decisions.