Clean Energy Fuels Corp. is a renewable energy company. The Company is engaged in the business of selling renewable and conventional natural gas as alternative fuels for vehicle fleets and related fueling solutions to its customers, primarily in the United States (U.S.) and Canada. Its principal business is supplying renewable natural gas (RNG) and conventional natural gas, in the form of compressed natural gas (CNG) and liquefied natural gas (LNG), for medium and heavy-duty vehicles and providing operation and maintenance (O&M) services to public and private vehicle fleets to customer stations. The Company is also focused on developing, owning, and operating dairy and other livestock waste RNG projects and supplying RNG (procured from third party sources and from its anaerobic digester gas RNG joint venture project with TotalEnergies S.E.) to its customers in the heavy and medium-duty commercial transportation sector.