Xcel Energy, Inc. is a holding company, which engages in the generation, purchase, transmission, distribution and sale of electricity and natural gas business through its subsidiaries. The company provides a comprehensive portfolio of energy-related products and services to customers in Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. It operates through three segments: Regulated Electric Utility, Regulated Natural Gas Utility and All Others. The Regulated Electric Utility segment generates, transmits and distributes electricity primarily in portions of Minnesota, Wisconsin, Michigan, North Dakota, South Dakota, Colorado, Texas and New Mexico. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. It also includes commodity trading operations. The Regulated Natural Gas Utility segment transports, stores and distributes natural gas primarily in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado. The All Others segment primarily includes steam, appliance repair services, nonutility real estate activities, processing solid waste into refuse-derived fuel and investments in rental housing projects that qualify for low-income housing tax credits. Xcel Energy was founded in 1909 and is headquartered in Minneapolis, MN.