September 27 (SeeNews) - Bulgaria's Energo-Pro Varna, part of Czech power utility group Energo-Pro, said on Tuesday that its subsidiary Electrodistribution North (ERP North) is investing 640,000 levs ($314,975/327,230 euro) in an overhaul of the electricity grids of three municipalities in Varna Region as part of its 2022 investment programme.