April 15 (SeeNews) - Elektroprivreda Republike Srpske (ERS), the power utility of Bosnia's Serb Republic, signed a contract for a 30 million marka ($16.6 million/15.3 million euro) loan with UniCredit Bank Banja Luka which will be used for the construction of hydro power plants (HPPs) on the river Bistrica, local media reported.