Clean Energy Fuels Corp. specializes in providing natural gas as an alternative fuel source and comprehensive fueling infrastructure, primarily serving markets in the United States and Canada. The company supplies various forms of natural gas, including bio-based renewable natural gas (RNG), compressed natural gas (CNG), and liquefied natural gas (LNG), specifically for medium and heavy-duty transportation. Beyond fuel delivery, Clean Energy Fuels offers full-spectrum services for fueling stations, encompassing their design, construction, operation, and ongoing maintenance for both public and private vehicle fleet clients.