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Heavy-Duty Zero-Emission Vehicle Information

This page is intended to provide information about zero-emission heavy-duty vehicle incentives, regulations, partners, and infrastructure to owners and operators of heavy duty vehicles in California.


Financial incentives are critical for supporting the advancement and wide-scale deployment of zero-emission technologies while simultaneously providing immediate emission reductions to help meet our air quality and climate goals.

Traditionally, monetary incentives from federal, state, and local sources may be used to demonstrate and assess feasibility of zero-emission technologies in various applications or to increase adoption of those technologies before required. Additionally, regulatory programs can provide strong incentives for businesses to develop or adopt zero-emission technologies in order to generate credits, which may be used for compliance or have monetary value (e.g., the Low Carbon Fuel Standard). Below are examples of traditional incentive programs that provide funding for zero-emission technologies:

Carl Moyer Program: Once commercialized, the Carl Moyer Program increases the deployment of clean technologies for early fleet and equipment turnover by providing incentives for replacing existing vehicles and equipment with the cleanest available. This program also includes the Voucher Incentive Program which provides funding opportunities for fleet owners with 10 or fewer vehicles to replace their older on-road heavy-duty diesel vehicles.

Community Air Protection Incentives for On-Road Heavy Duty Vehicles: Since 2017, the California Legislature budgeted significant funding to support Assembly Bill (AB) 617 (C. Garcia, Chapter 136, Statutes of 2017) with incentives directed by local air districts, focusing on advanced technologies where feasible, to improve air quality in communities of concern.

Hybrid & Zero-Emission Truck & Bus Voucher Incentive Program (HVIP): HVIP accelerates adoption of cleaner, more-efficient trucks. It works directly with dealers to apply the incentive at time of purchase.

Low Carbon Transportation Investments Program: This program focuses on advancing technologies through zero-emission demonstration projects and supports deployment of on-road zero-emission technologies. This program supports many of CARB’s on-road demonstration projects focused on advancing zero-emission technology in on-road applications where continued support is necessary for commercialization. Also supported is the Hybrid & Zero-Emission Truck & Bus Voucher Incentive Program (HVIP). HVIP accelerates adoption of cleaner, more-efficient trucks and works directly with dealers to apply the incentive at time of purchase.

Truck Loan Assistance Program: The program helps small-business fleet owners, affected by CARB's In-Use Truck and Bus regulation, to secure financing for upgrading their fleets with newer and cleaner trucks.

Volkswagen Environmental Mitigation Trust: This trust provides funding primarily for "scrap and replace" projects for the heavy-duty sector, including freight trucks, transit, shuttle, school buses and other freight vehicles and equipment.

Voucher Incentive Program (VIP): The on-road heavy-duty VIP provides funding opportunities for fleet owners with 10 or fewer vehicles to replace their older heavy-duty diesel vehicles.


When developing new or amending existing regulations, CARB’s goal is to obtain emission reductions to meet federal air quality standards, minimize negative health effects in the State’s most impacted and disadvantaged communities, and to lessen climate impacts.

CARB collaborates closely with stakeholders to ensure regulations are technologically feasible and cost-effective. These regulations can require manufacturers to develop and commercialize zero-emission technologies as well as increase or accelerate user adoption of those technologies. CARB also sets certification standards through new engine and vehicle emission control regulations, and the development of zero-emission certification standards are critical for the widespread deployment of zero-emission technologies through regulations and incentive programs. Below are some of the regulations that CARB currently has in place or under development to accelerate the deployment and adoption of zero-emission technologies in on-road applications:

Innovative Clean Transit: transforms the landscape of transit buses to be zero-emission and demonstrates the results as the beachhead technologies for the entire heavy-duty vehicle sector. All public transit agencies must gradually transition to a 100% zero-emission bus fleet by 2040. By 2026, 50% of large and 25% of small transit agencies’ new bus purchases must be zero-emission buses. By 2029, 100% of large and small transit agencies’ new bus purchases must be zero-emission buses.

Zero Emission Airport Shuttle: promotes the development and use of zero-emission airport ground transportation. Vehicles like airport shuttles that operate on fixed routes, have stop-and-go operations, maintain low average speeds, and in a central location are ideal candidates for targeting zero-emission technologies. By end of 2027, an airport shuttle fleet must have 33% of its shuttles be zero-emission. By end of 2035, 100% of its shuttles must be zero-emission.

Zero Emission Powertrain Certification: established a heavy-duty zero-emission powertrain standard and certification process that will help reduce variability in the quality and reliability of heavy-duty electric and fuel cell vehicles, ensure information regarding these vehicles and their powertrains are effectively and consistently communicated to purchasers, and accelerate progress towards greater vehicle reparability. This certification process will be required by the Zero Emission Airport Shuttle regulation starting in model year 2026 and the Advanced Clean Trucks regulation starting in model year 2024.

Advanced Clean Trucks: will accelerate a large-scale transition of zero-emission medium and heavy-duty vehicles from Class 2b to Class 8. Manufacturers who certify Class 2b-8 chassis or complete vehicles with combustion engines would be required to sell zero-emission trucks as an increasing percentage of their annual California sales from 2024 to 2035. By 2035, zero-emission truck/chassis sales would need to be 55% of Class 2b – 3 truck sales, 75% of Class 4 – 8 straight truck sales, and 40% of truck tractor sales.

Zero Emission Transport Refrigeration Unit (TRU): will transition truck TRUs to zero-emission, impose a stricter diesel PM emission standard for newly manufactured TRUs in the remaining categories, require the use of lower global warming potential refrigerant and include facility reporting requirements.

Advanced Clean Fleets: has a goal of accelerating the deployment of zero-emission medium and heavy-duty trucks in order to achieve a zero-emission California truck and bus fleet by 2045 where feasible, and significantly earlier for some market segments, such as last mile delivery and drayage applications.


CARB works with our industry, government and community partners to help facilitate the transition to zero emission technology through demonstrations, education, performance evaluation, and policy work.

CALSTART: CALSTART works with its member companies and agencies to build a high-tech clean-transportation industry that creates jobs, cuts air pollution and oil imports and curbs climate change.

California Air Districts: California’s 35 local Air Districts administer air quality improvement grant programs and are CARB's primary partners in efforts to ensure that all Californians breathe clean air.