Xcel Energy Inc. functions as a major U.S. utility holding company, primarily involved in providing comprehensive electricity and natural gas services through its various subsidiaries. Its operations are structured into two main divisions: the Regulated Electric Utility and the Regulated Natural Gas Utility segments. The company generates electricity using a diverse mix of resources, encompassing renewable options such as wind, nuclear, hydroelectric, biomass, and solar energy, alongside traditional sources like coal, natural gas, oil, wood, and refuse-derived fuels. In its natural gas business, Xcel Energy handles the acquisition, transportation, distribution, and sale of natural gas to retail customers, and also facilitates the transport of customer-owned natural gas. Beyond its core utility functions, Xcel Energy develops and leases essential natural gas infrastructure, including pipelines, storage, and compression facilities. The firm also strategically invests in rental housing projects and other non-regulated assets, and is responsible for procuring equipment required for the development of renewable generation facilities. Xcel Energy serves a broad customer base, including residential, commercial, and industrial clients, across specific areas within Colorado, Michigan, Minnesota, New Mexico, North Dakota, South Dakota, Texas, and Wisconsin. The company, originally established in 1909 as Northern States Power company, is headquartered in Minneapolis, Minnesota.