May 5 (SeeNews) - Croatian electrical equipment manufacturer Koncar Elektroindustrija [ZSE:KOEI] said on Wednesday that two of its units signed a 330 million kuna ($52.5 million/43.8 million euro) contract with HEP Proizvodnja, part of state-owned energy supplier Hrvatska Elektroprivreda (HEP), for the replacement of equipment at the Senj hydro power plant (HPP).