RNG Technology Reaches Tipping Point for U.S. Trucking Fleets

Renewable natural gas has overcome decades of technical and economic barriers to become a viable diesel alternative for trucking, according to Chad Lindholm, Senior Vice President of Sales at Clean Energy, speaking on FreightWaves' What the Truck podcast. The shift hinges on three converging factors: proven engine technology, stable pricing, and a fueling infrastructure network now capable of supporting commercial fleets at scale. The Cummins X15N, a 15-liter natural gas engine built at Cummins' Jamestown, New York plant, anchors the change. The engine delivers up to 450 horsepower and 1,850 pound-feet of torque, with tens of thousands of units already operating in Asia and a growing U.S. installed base. Fleet hesitation over alternative fuels has historically centered on two concerns: underpowered engines and uncertainty about service support. The X15N addresses both. As an OEM product from an established manufacturer, it eliminates the repower-or-conversion stigma that plagued earlier natural gas options. Clean Energy's ecosystem now includes major chassis makers PACCAR (Peterbilt, Kenworth) and Daimler (Freightliner), providing end-to-end integration from engine through final delivery. With slightly over a thousand X15N trucks on U.S. roads and demo units circulating among major carriers, fleets now have real-world performance data to evaluate against diesel. The competitive gap that once favored diesel has narrowed enough to make RNG adoption a financial calculation rather than a leap of faith.