In the era of digital transformation, IT services determine the operational activities of all divisions of companies in the energy sector. In modern conditions, the level of management of IT infrastructure, data, applications and systems has a direct and measurable impact on the success of companies, which is relevant for detailed study. Regardless of the size of the business, it is always necessary to ensure high quality of IT services, their availability and continuity. The key goal of the study is to highlight the main aspects of optimizing the efficiency of the energy sector. To achieve the goal, mathematical modeling and calculation tools were used to calculate the parameters of server computer systems and networks. To achieve the set goals and objectives, a mathematical model was developed for calculating the main parameters of server computing systems and networks, which makes it possible to increase the efficiency of using the resources of server computers in the energy industry. The efficiency of managing the IT infrastructure of energy companies ensures fault tolerance, availability and competitiveness of services in the market. The results presented can be applied in practice when planning and managing the IT infrastructure of a company in the energy sector.