The PNM San Juan Generating Station serves more than 400,000 electricity customers and more than 470,000 natural gas customers in about 100 communities within the state of New Mexico. It also sells electricity on the wholesale market. Since its founding in 1917, PNM has undergone several transformations, including name changes and its history. Based in Albuquerque, PNM is one of four subsidiaries of PNM Resources, an investor-owned energy holding company also based in Albuquerque. PNM's personal commitment to New Mexico includes being a good steward of its environment and achieving superior levels of environmental performance. These efforts include reducing air emissions and water usage at its power plants. There is a PNM San Juan Generating Station in Waterflow, N.M.