The company will complete the filling of the water transport system of the HPP on September 1 and afterwards the plant will be brought back on stream, EPCG said in a statement on Tuesday.
EPCG started the planned overhaul of the HPP on July 31, the company said.
The Montenegrin government is the majority owner of EPCG with a 57% stake while Italian company A2A owns 41.75%.
($=0.8968 euro)