This article discusses the process of creating and implementing an energy management system at an industrial enterprise. The system of energy management is a complex of measures aimed at automating energy accounting, identification and elimination of energy resource wastage, as well as to maintain power at a reasonable level technologically. Using functional simulation industrial plant is described as organizational and technical system with all incoming and outgoing flows. Method of calculating the efficiency of the processes of creation and implementation of an energy management system in the enterprise, depending on the nature of the outcomes will assess how effectively these processes occur. As part of the development of an energy management system should function evaluation of the effectiveness of implemented measures. Basis for ensuring a systematic approach developed technologies was a cycle of constant improvement PDCA: plan, do, check and the act. The developed algorithm will evaluate the result of the introduction and implementation of energy efficient measures .