TGC-1 is the leading producer of electricity and heat in the North-West region of Russia and the third largest territorial generating company in Russia in terms of installed capacity. It operates 55 electric generating stations in four regions of Russia –  St. Petersburg, Republic of Karelia, Leningrad Region and Murmansk Region. The company’s generation assets include hydroelectric, diesel and co-generation power plants.

TGC-1 has installed electric generation capacity of 6 315.6 MW and heat production capacity of 14 362 GCal per hour. The electricity produced is primarily sold on the domestic wholesale market with a portion also exported to neighboring Finland and Norway. The company is a strategic supplier of heat power to St. Petersburg, Petrozavodsk, Murmansk, Kirovsk and Apatity.

The state registration of the company took place March 25, 2005. TGC-1 began operating on October 1, 2005.  Since November 1, 2006 (following completion of the merger of Peterburgskaya Generating Company, Kolskaya Generating Company, Apatitskaya Generating Company and Karelenergogeneration with JSC "TGC-1"), the inter-regional production assets of TGC-1 have been under common control.

TGC-1’s shares are held by major shareholders — Gazprom Energoholding Ltd. (51.79%) and Fortum Power and Heat Oy (25.66 %).

TGC-1’s shares are on the quotation lists B on the RTS stock exchange and on the quotation list A on the MICEX stock exchange.