Available Voucher Funds
All Approved Technologies
$ -12,398,123
Small Fleet Low NOx NG
$ 0

Approved technologies include Zero Emission, Low NOx, Hybrid, and ePTO

Low NOx Natural Gas Engines

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 Oct 26, 2018, vouchers are no longer available for 8.9L engines for transit bus applications, and vouchers are only available for 8.9L engines for refuse vehicles if they are replacing a diesel refuse vehicle.

As of fall 2018, the Cummins Westport 8.9 liter natural gas engine and the Cummins Westport 11.9 liter natural gas engine are the only low NOx natural gas engines currently eligible for HVIP incentives and are certified to 0.02 g/bhp-hr NOx standard which is 90 percent below the current NOx standard.

The Incentive Value for Low-NOx Vouchers for New Vehicles is $45,000. Repowers using the L9N Qualify for a $50,000 Voucher and Repowers using the ISX12N qualify for a $52,000 voucher.

Currently, incentives for Low NOx natural gas engines are designed to cover the incremental cost of a Low NOx natural gas engine relative to a baseline diesel engine. 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.

Updated Requirements for Low-NOx Refuse Trucks – Effective October 26th, 2018

Purchases of new 8.9L Low NOx natural gas refuse collection and roll-off vehicles that replace existing natural gas vehicles are not eligible for voucher requests.

Purchases of new 8.9L Low NOx natural gas refuse collection and roll-off vehicles that replace existing diesel vehicles are eligible for voucher requests.

Purchases of new 8.9-L Low NOx natural gas transfer vehicles remain eligible, regardless of whether they replace a diesel vehicle or not.

Eligibility requirements for 8.9-L Low NOx vehicles that replace diesel vehicles:

  • The new Low NOx vehicle needs to be domiciled and operated within a 100-mile driving radius of the diesel vehicle it is replacing. If the replacement vehicle is more than 100 miles from the replaced vehicle, but still in the same service territory, the fleet can request an exception with a letter detailing the new vehicle’s service territory.
  • Proof of California vehicle registration, active at time of voucher request, is required for the diesel vehicle that is being replaced. There is no requirement to substantiate that the diesel vehicle has been replaced. Each diesel vehicle can only count once as a replaced vehicle. The fleet shall also identify the domicile location of each replaced diesel vehicle. The replaced diesel vehicle needs to be a collection or roll-off vehicle.

Renewable Natural Gas Requirement

Fleets that receive HVIP incentives for Low NOx natural gas engines must use 100% Renewable Natural Gas (RNG) for a minimum of three years. Securing RNG contracts can be straightforward and should be easy for transit agencies and refuse haulers to put in place, and can cost no more than existing conventional natural gas fuel. Dealers who are applying for Low NOx incentives on behalf of a fleet purchaser may submit proof of the customer’s RNG contract at any time prior to the award of funds. For a list of RNG providers with contact information and other details, please see Guide to the Low NOx RNG Requirement

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