MEPSO (Electricity Transmission System Operator of Macedonia) is a Joint Stock  company fully state-owned, established in 2005 after the transformation of the Electric Power Company of Macedonia. The core MEPSO activity is a smooth electricity transmission via the high voltage network, electric power system control and regular and duly electricity flow to its clients such as the large industrial consumers (Bucim, OKTA, Maksteel, Mitalsteel, USJE, Silmak, and FENI Industry), and to the low voltage grid of EVN Macedonia.