The Vreoci coal mines belong to the state-owned Kolubara group which was established in the mid-1950s. There are four open cast mines: B, D, Tannav and Istokzabad. They have two power plants. The Verikicrljeni power plant is connected to the mines by an electric 900 mm gauge line, whilst the power plant in Obremovac is connected by an electrified standard gauge line. The total output of all mines is about 25 million tons of coal per year. Of this amount, 21.5 million tons is for the two power plants, and the rest is for sale to other consumers.