CPS Energy is the nation's largest municipally owned energy utility providing both natural gas and electric service. Acquired by the City of San Antonio in 1942, they serve approximately 690,000 electric customers and almost 320,000 natural gas customers in and around the seventh-largest city in the nation. The 1,566-square-mile service area includes Bexar County and portions of Atascosa, Bandera, Comal, Guadalupe, Medina, Wilson and Kendall Counties.