A chart of a complex plant has been considered. An electrical power plant with steam and gas turbines has been united with underground coal gasification plant. The plant is consuming gasification products. A number efforts providing the ecological cleannes of such a plant, its performances (the power of electrical power plant is equal to 300 MW) and energy rate data depending on the pressure in a gas generator are mentioned. It has been obtained that overall efficiency of the plant is equal to 28.8 per cent in case of pressure increase up to 3 MPa. The use for methane production of an underground coal gasification plant has been considered.