October 26, 2025. Clean Energy Fuels Corp. has announced the launch of its second heavy-duty truck demo program, featuring the 2026 Freightliner Cascadia Gen 5-day cab equipped with the Cummins X15N natural gas engine.
The new truck will be showcased at the American Trucking Associations’ Management Conference & Exhibition (ATA MCE) in San Diego from October 25–28, offering attendees an exclusive preview before the program launches with its debut fleet partner.
Clean Energy’s demo truck program will give fleets across the country the opportunity to experience first-hand the capabilities of the Freightliner Cascadia Gen 5 equipped with the X15N. Participating carriers will be able to fuel at Clean Energy’s network of renewable natural gas (RNG) stations nationwide, showcasing the ease of integrating low-carbon fueling into their own fleet operations.
The Cummins X15N engine is designed to run on RNG. It offers a powerful, reliable, cleaner alternative to diesel, and fleets fueling with RNG can reduce emissions by more than 300 percent, achieving negative carbon-intensity results, while spending less per gallon of fuel.
The demo truck will travel through key freight corridors in California, Texas, Arizona, Illinois, Ohio, Michigan, Pennsylvania, Florida, and other states, allowing large and mid-sized fleets to try and test the engine’s capabilities in real-world conditions. The program is expected to run through 2028 or longer, as demand and interest continue to grow.
