First Propane Engines to Reach Near-Zero Emissions

ROUSH CleanTech unveiled the usage of renewable propane during a three-city roadshow in California this month.


ROUSH CleanTech revealed that the company’s certified 0.02g NOx Ford 6.8L 3V engine featured in its Ford medium-duty truck and Blue Bird school bus lineup can operate on renewable propane. It’s the first available engine for renewable propane that brings emission levels to “near-zero” as defined by California Air Resources Board.

These ultra-low NOx propane engines can help organizations take a giant leap toward meeting a state’s clean air standards while still providing a significant operating cost reduction over their current diesel fleet.

Renewable propane is a non-fossil fuel that is produced from 100 percent renewable raw materials, such as waste, residue and sustainably produced vegetable oils. There is growing interest in renewable propane (also known as biopropane) due to its near-zero emission levels, reduced greenhouse gases and ability to help meet growing demand for cleaner products.

Many companies in the U.S. and around the globe are developing renewable propane technology, with some production in commercial volume as a byproduct of renewable diesel plants.

When fueled by traditional propane autogas, the ultra-low NOx engine still is 90 percent cleaner than national emissions standards. Globally, propane production is up almost 6 percent year over year. When you factor in that the U.S. exported more than 10 billion gallons of propane in 2017, that should provide a clear signal to fleets that ample supply means price stability for many years to come.

There are many reasons that propane is the third most common engine fuel in the world powering more than 27 million cars, trucks and buses on a daily basis. But the main drivers are the economic and environmental sustainability this energy source can provide to organizations.

To learn more about ROUSH CleanTech’s alternative-fuel vehicle technology that powers school buses and Ford commercial vehicles, please visit