Public Service Company of Colorado (PSCo) was formed in 1923 to provide an electric generating station for the Denver area. By 1924, it had acquired most of the electric companies in northern and central Colorado. Originally a subsidiary of Cities Service Company, it became an independent autonomous operation in November 1943. By this time, it served 80 percent of Colorado’s gas and electricity needs. As demand for energy continued to grow, so did PSCo. Eventually, the company merged with SPS to form New Century Energies (NCE) in 1995.