Clean Energy Fuels Corp., together with its subsidiaries, provides natural gas as an alternative fuel for vehicle fleets in the United States and Canada. The company designs, builds, operates, and maintains fueling stations, as well as supplies compressed natural gas (CNG) and liquefied natural gas (LNG) fuel for medium and heavy-duty vehicles. Its CNG is used in automobiles, light to medium-duty vehicles, refuse trucks, and transit buses as an alternative to gasoline and diesel. The company also sells non-lubricated natural gas compressors and related equipment used in CNG and LNG stations; and produces renewable natural gas, which is used as vehicle fuel or sold for power generation. In addition, it offers vehicle finance services for the purchase of natural gas vehicles, as well as for the conversion of gasoline or diesel powered vehicles to operate on natural gas. Further, the company provides natural gas conversions, alternative fuel systems, application engineering, service and warranty support, and research and development services for natural gas vehicles. As of December 31, 2011, it served approximately 530 fleet customers with approximately 25,000 natural gas vehicles; and owned, operated, or supplied 273 natural gas fueling stations in 23 states within the United States, and British Columbia and Ontario within Canada, as well as in Peru. Clean Energy Fuels Corp. was incorporated in 2001 and is headquartered in Seal Beach, California.