Xcel Energy, Inc. operates regulated utilities serving approximately 3.9 million electricity customers and 2.2 million natural gas customers across eight U.S. states. Its utility businesses include Northern States Power, serving Minnesota, North Dakota, South Dakota, Wisconsin, and Michigan; Public Service Company of Colorado; and Southwestern Public Service Company, which serves Texas and New Mexico. Xcel Energy is among the largest renewable energy providers in the United States, with more than half of its electricity sales generated from carbon-free energy sources.