The contribution of renewable energy sources to the total electricity production in the world is steadily increasing. At the same time, the share of geothermal energy in the overall balance remains unjustifiably insufficient. The prospects for obtaining heat from the earth are limited by a number of technical and technological difficulties, which especially applies to that part of geothermal energy, which is called petrothermal. The article proposes an approach to improve the efficiency of a petrothermal power plant while maintaining the general concept of environmental friendliness.