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Xcel Energy Inc. is an electric and natural gas delivery company. The Company provides a comprehensive portfolio of energy-related products and services to approximately 3.9 million electric customers and 2.2 million natural gas customers through four utility subsidiaries, NSP-Minnesota, NSP-Wisconsin, PSCo and SPS. The Company operates through two segments. Its regulated electric utility segment generates, purchases, transmits, distributes and sells electricity in Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas and Wisconsin. In addition, this segment includes sales for resale and provides wholesale transmission service to various entities in the United States. The regulated electric utility segment also includes wholesale commodity and trading operations. Its regulated natural gas utility segment purchases, transports, stores, distributes and sells natural gas primarily in portions of Colorado, Michigan, Minnesota, North Dakota and Wisconsin.