E.ON AG, a holding company, provides electricity and gas services in Germany. It engages in the ownership and operation of power generation facilities; and the transmission, distribution, sale, and trading of electric power. The company also offers gas and heat to interregional, regional, and municipal utilities; traders; and industrial, commercial, and residential customers. E.ON AG operates a network of approximately 11,000 kilometers of gas pipelines and various underground storage facilities in Germany. In addition, the company has interests in residential real estate and real estate development, as well as operates a specialty chemical business. As of December 31, 2004, it owned a property portfolio of approximately 138,000 housing units. E.ON AG offers services primarily in the United Kingdom, Europe, Germany, Sweden, and Finland, as well as in the U.S. midwest market. The company is headquartered in Düsseldorf, Germany.