The June 2025 Calstart Zeroing in on Zero-Emission (ZIO ZET) Report Cover.
Photo: Calstart
2 min to read
CALSTART has released its latest Zeroing in on Zero-Emission Trucks Report, a market update detailing the number of medium and heavy-duty zero-emissions trucks (MHD ZETs) that have been deployed in the United States, according to data collected as of December 2024.
In this report, U.S. MHD trucks are classified as Class 2b (8,501–10,000 lbs.) through Class 8 (33,000 lbs. and above) vehicles including: cargo vans, medium-duty (MD) step vans, MD trucks, heavy-duty (HD) trucks, refuse trucks, and yard tractors.
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Key findings from this market update include:
As of December 2024, there have been more than 52,500 ZET deployments, up from 42,881 deployments at the midway point of 2024.
All HD segments saw a positive year-over-year increase: 56% refuse trucks; 30% yard tractors; and 1% HD trucks.
There are now 17 states with more than 1,000 ZETs.
The leading three states for total ZET deployments are California (7,684), Texas (5,009), and Florida (4,022).
The leading three states with the most significant increase in ZET deployments in 2024 are Maryland (439%), Georgia (247%), and New Mexico (141%).
Deployment of ZETs in Texas is fueled by regional incentive programs like the Texas Volkswagen Environmental Mitigation Program grants and the Texas Clean Fleets Grants; Maryland has emerged as a ZET leader through policy strategy and multistate planning; and Georgia has developed a robust economic development strategy that has attracted more than $28 billion in clean energy manufacturing investments since January 2021.
The total numbers of zero-emission trucks (ZET) deployed in the United States as of December 2024.
Photo: Calstart
This report signals growth in ZET deployments but clarifies that the freight industry is not on track to meet federal climate goals for 2030.
States that set ambitious deployment targets and implement vehicle and infrastructure incentive programs are prime examples of how to decarbonize the freight industry, proving that state leadership is critical for adoption.
CALSTART will continue to update the data in subsequent editions.
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