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The paper reviews an energy efficient multi-circuit power plant with three independent power generation circuits and a generator control system. The proposed three-circuit autonomous power plant was constructed in accordance with a modular design. The structural scheme, design, operating modes, and simulation model in the Matlab+Simulink environment is presented. The increase in electrical efficiency at this cogeneration plant is due to the use of low-temperature boiling point heat-transfer fluids. This article proposes the method of increasing the efficiency of an existing installation from 60 kW to 100 kW by equipping it with additional equipment. This equipment provides deeper utilization of flue gas heat. If the base power plant is 60 kW, the heat input is about 200 kWh (an efficiency of the station is 30%), then the total electricity generation will be 100 kW. In this case, an additional 40 kW of power is without increasing fuel consumption.