Wolfgang Nolden

RheinEnergie AG engages in the production, trading, network operation, as well as distribution of energy and water. Its products include electricity, natural gas, water, district and local heating, as well as steam. The firm also provides energy-related services. The company was founded in 1863 and is headquartered in Cologne, Germany.

Gas-, Elektrizitaets- und Wasserwerke Köln AG supplies power and gas. The company is headquartered in Cologne, Germany.

Wohnungsgesellschaft der Stadtwerke Köln mbH is a private company based in Cologne, Germany. The CEOs of the German company are Dirk Kolkmann, Dieter Steinkamp. The company engages in rental and leasing of residential buildings and apartments.

GEW Köln AG is a subsidiary of Stadtwerke Köln GmbH and is based in Cologne, Germany. The German company is primarily involved in providing energy services. According to their company description, GEW Köln AG is a subsidiary of Stadtwerke Köln GmbH, which is ultimately controlled by the City of Cologne. Dieter Steinkamp has been the CEO of the company since 2007.

Stadtwerke Köln GmbH engages in the supply and distribution of electricity, natural gas, water, and district heating. It also provides river port, transportation, and public transport systems services. The company was founded in 1960 and is headquartered in Cologne, Germany.