Provides information on the design of electrical networks of power systems, methods of technical and economic calculations, the selection of parameters and network diagrams, data on electrical equipment, overhead and cable lines, and the cost of electrical network elements. This publication takes into account the latest changes in the structure of the Russian energy sector and the requirements of new regulatory documents; new technical data on cable lines, autotransformers, switching devices and other types of equipment are provided, as well as updated cost indicators of network facilities; modern approaches to the formation of electricity tariffs are considered. The reference book is intended for engineers involved in the design and operation of energy systems and electrical networks, as well as for students of energy universities.