Through the Hybrid and Zero-Emission Truck and Bus Voucher Incentive Project (HVIP) and Low NOx Engine Incentives, the California Air Resources Board provides vouchers to eligible fleets to reduce the incremental cost of qualified electric, hybrid, or natural gas trucks and buses at the time of purchase. Vouchers are available on a first-come, first-served basis and range from $2,000 to $300,000. Only fleets that operate vehicles in California are eligible. For more information, including a list of qualified vehicles and other requirements, see the HVIP website.