This thesis consists of seven chapters, which will be briefly described below. The first chapter is an introduction, through which a brief description of working with goals is given. Through the second chapter of the paper, the theoretical foundations of wind energy are given and the basic problems of wind energy integration into the system, its utilization and wind speed distribution described by Weibull and Rayleigh probability distributions are highlighted. In the third part, modern versions of wind turbines as well as their parts (tower, rotor, gearbox, brakes, generator) and power regulation of wind turbines are described. In the fourth chapter, an overview of the connection of the wind power plant to the power grid is given, as well as the topology of the internal MV network, a medium-voltage plant is also described with examples of distribution cabinets and a presentation of the switching apparatus used in the MV plant. Along with the medium-voltage plant, a description of the types of medium-voltage cables used for connection and their characteristics is given. The fifth chapter gives examples and a description of three different methods of calculating annual electricity losses. energy (annual simulation of power flows on an hourly basis, discretization of the production duration curve, approximate calculation). The sixth chapter refers to a brief description of the data of the wind turbine that was taken as an example in this thesis, a detailed description of two variants of the internal VE network (spatial representation of wind farms and cable network outlets) that were considered in the analysis. After the aforementioned theoretical considerations, a computer simulation of the calculation of annual electricity losses was performed. of energy and comparison of used methods, calculation of investment costs, costs of electricity losses. energy and selecting the most favorable variant using the cost difference method.