The lack of developed methodological solutions for determining the energy efficiency class of economic entities limits the ability to achieve the goal of the State program of the Russian Federation “energy Efficiency and energy development” to reduce the energy intensity of the gross domestic product. To solve the set state tasks aimed at reducing the energy intensity of the national economy, it is necessary to develop a Methodology for assessing the energy efficiency classes of industrial facilities. The development of the Methodology will become a prerequisite for the implementation of measures to ensure energy-efficient policies of energy-intensive enterprises. The methodology will ensure effective planning of budget funds allocated for energy-saving measures, as well as a systematic reduction in the energy intensity of the national economy. The aim of the study is to create a Development Concept for a Methodology for assessing the energy efficiency classes of industrial facilities, defining the goals of its creation, the most important problem it is aimed at solving, identifying the methods and approaches that it relies on, reflecting its development plan, as well as expected results. The proposed Concept for developing a Methodology for evaluating the energy efficiency classes of industrial facilities, presented in the form of the model, will identify the basic elements that should be taken into account when developing it, and assess how harmoniously they are combined. The practical significance of this concept is that it creates a fundamental basis for the development of Methods for evaluating the energy efficiency classes of industrial facilities, taking into account the specifics and scale of their activities.