Public Service Company of Colorado engages in the of generation, purchase, transmission, distribution, and sale of electricity in Colorado. It operates through the following segments: Regulated Electric Utility, Regulated Natural Gas Utility, and All Other. The Regulated Electricity segment generates electricity which is transmitted and distributed in Colorado. It also comprises sales for resale and provides wholesale transmission service to various entities in the United States. The Regulated Natural Gas Utility segment focuses in the transportation, storage, and distribution of natural gas in portions. The company was founded in 1924 and is headquartered in Denver, CO.