CPS Energy is one of the largest municipally owned energy companies that provide natural gas and electric services in the United States. It is a part of the City of San Antonio. The company serves more than 900,000 customers. It serves clients in Bexar, Atascosa, Bandera, Comal, Guadalupe, Medina, Wilson and Kendall counties in Texas. The company is affiliated with the Electric Reliability Council of Texas, Public Utility Commission of Texas and Department of Energy. It offers Windtricity, which is wind-generated electricity. In operation for more than 100 years, CPS Energy serves clients in the residential and commercial sectors. It provides peak saver thermostats, as well as online bill payment solutions. CPS Energy has a partnership with ENERGY STAR. In addition, the company conducts energy education and safety programs.