Ralf Zimmermann

Süwag Energie AG distributes electricity, natural gas and heat. It offers these products and its related services to both private and corporate clients. The company was founded in 2001 and is headquartered in Frankfurt, Germany.

Aleris Corp. engages in the manufacture of aluminum rolled products. It operates through the following geographical segments: North America, Europe, and Asia Pacific. The North America segment consists nine manufacturing facilities. The Europe segment includes two aluminum rolling mills and aluminum cast house. The Asia Pacific segment comprises the Zhengjiang rolling mill. The company was founded in December 2004 and is headquartered in Cleveland, OH.

Remondis GmbH acts as a holding company with interests in providing waste management services. It is responsible for controlling waste disposal and recycling activities. As a provider of environmental services, it primarily deals with the disposal of domestic waste. The company possesses sites all over Germany at which it operates sorting, processing, recycling and treatment plants. The company also runs the service network in the German disposal industry. The company is headquartered in Viersen, Germany.

Berliner Wasserbetriebe supplies drinking water. Its core task is to supply residents of Berlin and the surrounding area with drinking water and dispose of their wastewater. It operates water works and also provides sewerage services. Not only does it perform conventional wastewater treatment at its wastewater treatment works, but has also equipped the majority with biological nutrient elimination facilities, to maintain the quality of Berlin's lakes and rivers. The company was founded in 1992 and is headquartered in Berlin, Germany.

Berlinwasser Holding GmbH provides water services. The firm engages in disposal and treatment of wastewater. The company was founded in 2000 and is headquartered in Berlin, Germany.

RWE Energy AG supplies gas, water and electricity in Germany and continental Europe. Its territory includes Austria, the Czech Republic, Germany, Hungary, Poland and the Netherlands. It provides services to residential households through SMEs, industrial companies, municipal utilities on to regional energy utilities. The company is headquartered in Dortmund, Germany.

envia Mitteldeutsche Energie AG operates as an investment holding company which focuses on the electricity distribution, gas, water supply, and telecommunications sectors. The company was founded in 1999 and is headquartered in Chemnitz, Germany.

Stadtwerke Duisburg AG provides utility services and is ultimately controlled by the City of Duisburg. The company is based in Duisburg, Germany. The German company was founded in 1854. Marcus O. Wittig has been the CEO of the company since 2012.