The article discusses a new approach to the formation of energy–saving program for the power supply system, which aims to realize the maximum amount of reserve electric power saving system. The combination of all technical and circuit modifications at each site and system level power that creates the energy–efficient systems, and is an initial list of energy saving measures will be included into the program. The general list of energy–saving measures on the results of the program to optimize the structure and parameters of the system in terms of the minimum electric power losses in it is formed. For the power supply system on the basis of a regulatory evaluation of the effectiveness of energy saving measures it is proposed the criteria selection of cost–effective measures to reduce energy losses in the system: the saved energy cost should not exceed the current tariff for electricity consumption from the grid