 This research paper examines the efficiency of power plants in Russia, as well as the techno-economic processes and indicators involved. It also provides recommendations for the practical application and improvement of these plants. The capital expenditure for solar water heating, SWH, plants with a drain-down system is 1.4 to 1.6 times less than traditional SWHs with circulation systems, while their payback period does not exceed 5 to 5.7 years. Biogas produced by specialized plants has a cost of 5,000 to 60,000 per cubic meter, but the price of biogas produced in low-energy power plants is approximately 0.000 to 270,000, making it more affordable than natural gas. Therefore, the use of biogas is economically viable at present. This article was authored by Alexei Mykolov.