The terms, definitions and basic concepts in the field of legal aspects of the activities of energy services of enterprises (organizations) are given with links to the relevant legislative, legal, by-laws and regulatory and technical documents. Schemes are presented that characterize the content of the main provisions of legal acts and regulatory documents necessary in the daily practical activities of energy services of enterprises (organizations), types of legal violations, forms of liability, as well as the procedure for the actions of managers and specialists of energy services when solving legal problems. The directory includes more than 400 terms and more than 40 diagrams. For managers and specialists of energy services of enterprises (organizations) - consumers of electrical energy, interacting with energy supply organizations and state energy supervision authorities, as well as for specialists from energy supply organizations and state energy supervision authorities, design, installation, commissioning organizations, occupational safety specialists monitoring electrical installations. The reference book can be used in training and advanced training of specialists in the energy sector, as well as in preparation for testing knowledge of norms and regulations for working in electrical installations.