HVIP provides attractive incentives for the purchase of CARB-approved Low NOx natural gas engines. Incentives for Low NOx natural gas engines are available for new and repowered vehicles on a first-come, first-served basis.
As of summer 2017, the Cummins Westport 8.9 liter natural gas engine is the only CARB-approved low NOx natural gas engine available under the program and is certified to 0.02 g/bhp-hr NOx standard which is 90 percent below the current NOx standard. The Cummins Westport 8.9 liter Low NOx engine is well suited for transit buses and refuse trucks and can be seen on HVIP’s list of eligible vehicles. Incentives range from $8,500-15,000 per engine. A larger version of the engine (11.9 liter) suitable for freight trucks is expected to be available in early 2018.
Currently, incentives for Low NOx natural gas engines are designed to cover the incremental cost of a conventional natural gas engine to that of the Low NOx version. Incentives for Low NOx engines may be used in conjunction with other vehicle incentives (such as the California Energy Commission’s Vehicle Incentive Project or programs managed by regional air districts) which cover the incremental of a diesel engine to that of a conventional natural gas engine, as long funding for the incremental Low NOx portion is not duplicated.