BANJA LUKA (Bosnia and Herzegovina), June 6 (SeeNews) – A consortium led by the power utility of Bosnia's Serb Republic and the entity's energy ministry signed a 50-year concession deal for the construction and use of the 93.52 MW Buk Bijela hydro power plant (HPP) on the river Drina, worth some 382.4 million marka ($222.1 million/195.5 million euro), the ministry said.