In this article the author examines rates and features of creating the common power line network of the Irkutsk energy system (1950-1990s.) and points to its importance for urban and agriculture development, as well as for establishing cooperation with other energy organizations (for example Buryatenergo and Krasnoyarskenergo). In chronological sequence a brief history of creation and development of Irkutskenergo power lines is provided in the article. The article states: 1950-1960s creation and upgrading of urban networks; the beginning of establishing the energy connection between cities (the first Angarsk-Irkutsk power line with 110kV electric voltage and Irkutsk-Bratsk power line with 220kV electric voltage); 1960-1970s intensive building of high voltage power lines with 220kV and 500 kV electric voltage (PL220 and PL-500). The beginning of the interaction of Irkutskenergo with other regions. Growth of the electrical networks determined the necessity of creating the specialized network enterprises to control the work of the networks more efficiently.; 1970-1980s intensification of the parallel work of the Irkutsk power system with Buryatenrgo and Krasnoyarskenergo; 1980-1990s great attention is paid to such issues as improving the power supply of agricultural consumers; 1990-1995s modernization of outdated power lines. Centralized and uninterrupted power supply for consumers, except in remote areas because of the undeveloped lowvoltage lines. O.O. Gotovko points to the role of highand low-voltage power lines of Irkutskenergo in creating the Common energetic zone exemplified by the Irkutsk region. In conclusion, the author concludes that, since the moment of its creation PL-500 is the main energy artery of Eastern Siberia together with other power lines. It gradually became power supplying for the entire social and industrial infrastructure of Irkutsk, Usolye-Sibirskoe, Cheremhovo, Svirsk, Angarsk, and hundreds of middle-sized and small settlements of the Irkutsk region.

Кратко изложена история строительства и модернизации высоковольтных и низковольтных линий электропередач в Иркутской области в 1950-1990-х гг. Рассмотрено значение низковольтных линий «Иркутскэнерго» для развития внутригородского пространства и сельских районов области, а высоковольтных для междугородного пространства и установления взаимовыгодных электросвязей с «Красноярскэнерго» и «Бурятэнерго». Выделены хронологические этапы развития ЛЭП Иркутской области.