PJSC Sakhalinenergo engages in the generation, transmission, distribution, and sale of electrical and thermal energy across the Sakhalin Region of Russia; core operations encompass wholesale and retail electricity supply, heat production and delivery via electrical heating networks, and hot water distribution to industrial and residential consumers in 18 of the region's 23 municipalities, including Yuzhno-Sakhalinsk and Vostok. The company operates key facilities such as the Sakhalin GRES-2 coal-fired power station and Yuzhno-Sakhalinskaya-1 power station, which together cover approximately 78% of the island's electricity needs, supplemented by diesel generation through its wholly owned subsidiary Novikovskaya dizel’naya energostantsiya OAO and investment activities via Investitsionnaya kompaniya Energoinvest OOO; it functions through one branch and four subdivisions within the Sakhalin Oblast. As a subsidiary of Public Joint-Stock Company Federal Hydro-Generating Company - RusHydro, which holds a majority stake of around 57.8%, PJSC Sakhalinenergo serves as the primary utility for the isolated Sakhalin energy system, primarily fueled by coal from sources like the Solntsevsky complex. Founded in 1993 and headquartered at 43 Kommunisticheskiy Prospect in Yuzhno-Sakhalinsk, the company focuses exclusively on domestic operations within the Sakhalin Region. Recent developments include the appointment of Pavel Yakovlev as CEO in June 2024, succeeding prior leadership to oversee ongoing operations amid regional energy demands; in April 2025, it sold 384 greenhouse gas emission quotas to MUE “Nogliki Vodokanal” as part of the Sakhalin region's emissions limitation experiment; additionally, minority shareholder Andrey Yermolin increased his stake to 5.1967% through a recent acquisition.