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OGK-6

A former Russian wholesale power-generation company formed by consolidating six thermal power businesses and later merged into OGK-2.

Last updated August 24, 2026

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Overview

OGK-6, formally known as the Sixth Wholesale Power Market Generating Company, was a Russian electricity and heat-generation company created during the restructuring of the country's wholesale electricity sector. The company brought together six thermal power-generation businesses and operated a geographically dispersed portfolio of large generating stations, including Novocherkassk GRES, Kirishi GRES, Ryazan GRES, Krasnoyarsk-2 GRES, Cherepovets GRES, and GRES-24 at Novomichurinsk. The consolidation gave OGK-6 an installed electrical capacity of approximately 9,052 MW and installed heat capacity of about 2,704 Gcal/h. Its portfolio included some of Russia's largest thermal stations and served industrial, commercial, and residential demand through electricity and district-heating output. In 2007, the company's power stations produced approximately 32.065 TWh of electricity. The business was therefore positioned as a large-scale wholesale generator rather than a consumer-facing retail electricity brand. OGK-6 shares traded on the Moscow Interbank Currency Exchange and the Russian Trading System. Its corporate development was closely connected to the consolidation of Russian power assets under major strategic owners. In April 2010, Gazprom, identified in contemporary reporting as a major shareholder of both OGK-2 and OGK-6, announced plans to combine the two companies. The transaction was intended to create a larger generating group with ten power stations and approximately 17,750 MW of capacity. The merger into OGK-2 was completed by 1 November 2011. As a result, OGK-6 ceased to operate as an independent company. Its historical significance lies in its role as one of the large wholesale-generating companies created during Russia's power-sector reorganization and in the subsequent consolidation of those assets into larger electricity groups. OGK-6 is therefore best understood as a historical corporate entity and generation portfolio, not as an active standalone brand.

History

OGK-6 emerged from the restructuring of Russia's electricity industry, in which generation assets were reorganized into large wholesale power-generation companies. The company was formed by combining six generation businesses into a single corporate structure. The facilities brought together in 2006 were Novocherkassk GRES, Kirishi GRES, Ryazan GRES, Krasnoyarsk-2 GRES, Cherepovets GRES, and GRES-24 at Novomichurinsk. This portfolio gave OGK-6 a substantial presence in Russian thermal generation. The six stations had combined installed electrical capacity of about 9,052 MW and installed heat capacity of approximately 2,704 Gcal/h. The assets were located in different Russian regions and served both the wholesale electricity market and local heat requirements. GRES-24 was subsequently merged with Ryazan GRES in November 2008, further integrating the company's generation portfolio. By 2007, OGK-6's plants had generated approximately 32.065 TWh of electricity. The company ranked among Russia's largest generators by installed capacity and was described as the country's fourth-largest power company on that measure. Its business model centered on operating large thermal power stations and selling electricity and heat rather than marketing a consumer retail product. OGK-6 was publicly traded, with its shares quoted on MICEX and RTS. The company later became part of a broader consolidation process involving Gazprom's power-generation interests. In April 2010, Gazprom announced a plan to merge OGK-6 with OGK-2. The proposed combination was intended to create a larger generation company with ten power stations and approximately 17,750 MW of capacity. The transaction was completed by 1 November 2011, when OGK-6 was merged into OGK-2. Its independent corporate identity and stock-market presence consequently ended. The former OGK-6 stations and their operating capabilities became part of the successor company's broader generation portfolio. OGK-6 is therefore a defunct Russian power-generation company whose principal historical importance is its contribution to the consolidation and centralization of large-scale thermal generation assets.

  • 2011

    Merger into OGK-2 completed

    [1]

    The merger was completed by 1 November 2011, ending OGK-6 as a standalone company.

  • 2010

    Merger with OGK-2 announced

    [1]

    Gazprom announced plans to combine OGK-6 with OGK-2 in order to create a larger generating company.

  • 2008

    GRES-24 integrated with Ryazan GRES

    [1]

    GRES-24 at Novomichurinsk was merged with Ryazan GRES in November 2008.

  • 2007

    Electricity output reaches approximately 32.065 TWh

    [1]

    The company's power stations generated approximately 32.065 TWh of electricity during the year.

  • 2006

    Formation through consolidation of six generation companies

    [1]

    OGK-6 was formed by combining six Russian thermal power-generation businesses into one wholesale generating company.

Products and positioning

A large Russian wholesale thermal-power generator created through consolidation of regional generation assets.

  • Wholesale power generation

    Electricity generation

    OGK-6 generated electricity from a portfolio of large thermal power stations. Its approximately 9,052 MW installed capacity placed it among Russia's largest power companies by generating capacity, and its stations supplied electricity to the wholesale market.

  • District and industrial heat

    Heat generation

    In addition to electrical output, OGK-6's thermal stations supplied heat for local district-heating systems and industrial users. The combined installed heat capacity of the portfolio was approximately 2,704 Gcal/h.

Brand decisions

  • 2010

    Proceed with the OGK-2 combinationM&A

    Background

    Gazprom was a major shareholder of both OGK-2 and OGK-6 and sought to consolidate their generating assets into a larger company.

    Action taken

    A merger plan was announced for OGK-6 and OGK-2, with the proposed combined company expected to operate ten power stations and approximately 17,750 MW of capacity.

    Aftermath

    The merger was completed by 1 November 2011, and OGK-6 ceased to exist as an independent corporate entity.

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