Clean Energy Fuels Corp. is a provider of natural gas as an alternative fuel for vehicle fleets in the United States and Canada. The Company designs, builds, operates and maintains fueling stations and supplies its customers with compressed natural gas (CNG) fuel for light, medium and heavy-duty vehicles and liquefied natural gas (LNG) fuel for medium and heavy-duty vehicles. The Company also manufactures, sells and services non-lubricated natural gas fueling compressors and other equipment used in CNG stations and LNG stations. It provides operation and maintenance (O&M) services to customers, offers assessment, designs and modification solutions to provide operators with code-compliant service and maintenance facilities for natural gas vehicle fleets, transport. It offers vehicle finance services for some of its customers' purchases of natural gas vehicles. The Company sells CNG to industrial and institutional energy users who do not have direct access to natural gas pipelines.