Incorporated in 1924, the Public Service Company of Colorado is an operating utility engaged in the generation, transmission, sale and distribution of electricity for residential and commercial applications. It offers electric utility services to more than 1 million customers throughout Colorado. Additionally, the company is involved in the purchase and transportation of natural gas for the retail industry. It maintains operations through various subsidiaries, including 1480 Welton, PSRI, and Green and Clear Lakes Company. The Public Service Company of Colorado is a wholly owned subsidiary of Xcel Energy, which is a publicly traded company that provides a range of energy-related products and services.