Xcel Energy Inc., through its subsidiaries, engages primarily in the generation, purchase, transmission, distribution, and sale of electricity in the United States. It operates through Regulated Electric Utility, Regulated Natural Gas Utility, and All Other segments. The company generates electricity through coal, nuclear, natural gas, hydroelectric, solar, biomass, oil, wood/refuse, and wind energy sources. It also purchases, transports, distributes, and sells natural gas. In addition, the company develops and leases natural gas pipelines, and storage and compression facilities; and invests in rental housing projects, as well as procures equipment for construction of renewable generation facilities. It serves residential, commercial, and industrial customers in the portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas, and Wisconsin. The company was founded in 1909 and is based in Minneapolis, Minnesota.