Gelsenwasser AG supplies gas, electricity, and water to people and businesses in Germany. The company supplies natural gas, hydropower electricity, and drinking water. It also rents standpipes for construction sites or events; and provides various water supply services for municipalities, municipal utilities, utilities, sanitation companies, and industry and commerce customers under the GELSENWASSER + brand. In addition, the company offers HEAT + products, including HEAT + BASE, WARMTH + COMFORT, HEAT + SERVICE, HEAT + MICRO-CHP, and HEAT + MINI CHP home heat supply solutions. Further, it provides online service center, promotion, debugging, and other services; and simply GELSENWASSER, a magazine for private households. The company was formerly known as Wasserwerk für das nördliche westfälische Kohlenrevier and changed its name to Gelsenwasser AG in 1973. The company was founded in 1887 and is headquartered in Gelsenkirchen, Germany. Gelsenwasser AG is a subsidiary of Wasser und Gas Westfalen GmbH.