The Sixth Wholesale Power Market Generating Company JSC (OGK-6) was a Russian power generation company formed by merger of six generation companies. In 2006, the following power plants were merged into single company:
The installed capacity of all six thermal power plants was about 9,052 MW which made OGK-6 the fourth largest power company by installed capacity in Russia. The total installed heat of OGK-6 plants amounted to 2,704 Gcal/h. The power output of the OGK-6 power plants in 2007 was around 32.065 TWh.
OGK-6 shares were traded on MICEX and RTS.
In April 2010, it was announced that Gazprom, the major shareholder of OGK-2 and OGK-6, will merger OGK-6 into OGK-2 to create a single company with 10 power stations and a capacity of 17,750 MW. The merger was completed by 1 November 2011.