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 using coal, nuclear, natural gas, hydro, solar, biomass, oil and refuse, and wind energy sources. It is also involved in the purchase, transportation, distribution, and sale of natural gas. In addition, the company engages in developing and leasing natural gas pipelines, and storage and compression facilities; and investing in rental housing projects. It serves residential, commercial, and industrial customers, as well as public authorities in the portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas, and Wisconsin. Xcel Energy Inc. was founded in 1909 and is based in Minneapolis, Minnesota.