RuhrEnergie GmbH (EVR), a wholly-owned subsidiary of E.ON Kraftwerke GmbH (EKW), markets the energy generated by E.ON Energie's power stations in Germany's Ruhr region and Schkopau its base in Gelsenkirchen. The company's key accounts include energy utilities like RWE Power, Vattenfall Europe Generation and Deutsche Steinkohle AG (DSK) as well as chemicals manufacturers such as BP, Ruhr OEL, SABIC, INEOS, and Degussa. RuhrEnergie GmbH services power, steam, and compressed-air supply contracts with these key accounts, issues monthly bills, and matches E.ON power-station deployment in the Ruhr region and the new German states to customer demand.

RuhrEnergie GmbH also operates and maintains a 35-kV feeder line as well as steam, compressed-air, and water networks.

A part from these localized generation and transmission functions, the company is responsible for reporting statistical information on EKW's entire generation fleet to the relevant regulatory bodies of various German states. In addition, RuhrEnergie is responsible for the co2-emission management of EKW and processes the E.ON Energie Group's internal monthly accounts for intra-Group supplies of electricity to E.ON Sales & Trading from EKW and the Group's nuclear generation company, E.ON Kernkraft GmbH.