Xcel Energy Inc. is a public utility holding company. The Company�s operations include the activity of four wholly owned utility subsidiaries that serve electric and natural gas customers in eight states. These utility subsidiaries are NSP-Minnesota, NSP-Wisconsin, Public Service Company of Colorado (PSCo) and Southwestern Public Service Co. (SPS), and serve customers in portions of Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. The Company has two segments. The regulated electric utility segment generates, transmits and distributes electricity in 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. The regulated natural gas utility segment transports, stores and distributes natural gas in portions of Minnesota, Wisconsin, North Dakota, Michigan and Colorado.