TGC-1 is the leading producer and supplier of electricity and heat power 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 – the City of St Petersburg, Republic of Karelia, Leningrad Region and Murmansk Region. The  company’s generation assets include thermal, hydroelectric, diesel and co-generation power plants and it has a heating network of 940 km. TGC-1 has installed electric generation capacity of 6,275.45 MW and heat production capacity of 14,548 Gcal per hour. The electricity produced by it 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.

Shares of TGC-1 are traded on the quotation lists “B” on the RTS stock exchange and on the quotation list “A2” on the MICEX stock exchange.

Major Shareholders: Gazprom energoholding  57.79%, Fortum Power and Heat OY 25.66 %, other shareholders 22.55%.