This article presents energy system calculation of automobile plant supplying from thermal power center (TPC) with certain strength. The purpose of this calculation is correct selection of the energy system equipment according to the given parameters of the plant and preparing the electric supplying scheme of the plant. The power supplying TPC is such a kind of electric power stations that produces not only electric energy, but also, heat energy for the inner part of the plant. From this point of view, the coefficient of efficiency of such stations is more than 80%. Produced electric power is supposed to be transferred to industry establishments, distributed and used with high economy and effectiveness. Correct structure of the electric supplying system in industry establishments has great importance in providing the necessary capacity and relevant quality of electric energy to industry objects, mountings, devices and mechanisms by the power systems. The calculation of the electric loads of the plant and the ways of choosing efficient voltage of the supply net are represented in this article. The article provides information about location of the main step-down substation (MSDSS) in the plant territory that are used for lowering the voltage from stepup sub-station and conveying it to the consumers, its constructive structure and choosing the number, power and types of transformers for placing within it. It is impossible to imagine power supply schemes without conductive electric lines and cables. Choosing of electric transmission lines, switchgears for opening and closing circuit and types of protecting apparatuses relevant to the calculated short circuit current are given here. In former times, it was not possible to analyze the power supply scheme before the scheme construction; with the help of available new software, it is possible now. From this point of view, ETAP program was used and it is more effective for the analysis of the schemes.