FIELD: power industry. SUBSTANCE: in the steam machine, containing an engine block with steam cylinders, piston and steam spool valves, supplied from the external steam boiler via the distribution network, an electric generator, a set of pistons for pumping water, ejector mixer and hydraulic motor are additionally provided. The additional hydraulic unit is connected to a water line via the inlet. The first high-pressure water inlet of it is connected to the hydraulic motor, the rotation of which is passed to the electric generator, generating the main portion of electric power. The waste steam is fed from the second output of the additional unit to the inlet of the ejector-mixer. The waste water is fed to the other inlet from the hydraulic motor. The reheated water, which received additional kinetic energy, passes through the capacitor bank into the water line. The capacitor bank is used for the purposes of heat supply. To generate additional electric power, a heat storage is used, which is connected in parallel to the capacitor bank, the heat exchanger of which is included in the closed circuit of the low-boiling working medium, and the turbine of the circuit is connected to an additional electric generator. EFFECT: increase in the efficiency of steam conversion.