The article is devoted to the application of energy performance contracts for the electrification of rural remote areas. The research presents a universal methodology for determining the main parameters of an energy performance contract. This methodology includes four main parts. The first part has a description of the climatic parameters on the territory under consideration and their use in mathematical modeling of isolated photovoltaic system operating modes. The second part has the mathematical models of an isolated photovoltaic system with battery energy storage system and diesel power plant. The third part consist of relevant questions and features of battery energy storage system operation in isolated energy systems. The fourth part is a hierarchical model of an energy performance contract. The model has the main indicators required for the client and contractor. These parameters are contract duration, contractor fee, modified levelized cost of energy and optimal composition of isolated energy system equipment. An isolated energy system located on the territory of Siberia was considered. The optimization results have the following key indicators: photovoltaic system (80 kW) with battery energy storage system (240 kW⋅h) reduces diesel fuel consumption by 68%. The energy performance agreement duration is 5 years and the modified levelized cost of energy is 15.53 RUB/kW⋅h.