Zeroing in on Zero-Emission Trucks highlights the continued increase in medium- and heavy-duty (MHD) zero-emission truck (ZET) deployments in the United States. This series provides a concise and current snapshot of ZET deployment statistics and the existing U.S. MHD truck market. These reports offer insights into key trends driving growth in ZET adoption, as well as opportunities to further accelerate this growth that can help inform policymakers, original equipment manufacturers, fleet owners, and financial stakeholders.
The June 2026 Zeroing in on Zero-Emission Trucks (ZIO ZET) Market Update points to renewed momentum in the U.S. medium- and heavy-duty ZET market. After a slower start to 2025, deployments accelerated in the second half of the year, with ZETs representing 4.14% of all truck deployments from July through December, up from 1.32% in the first half of 2025. This acceleration brought cumulative ZET deployments to 72,309 vehicles nationwide by December 2025. While cargo vans continued to drive much of this growth, the broader story is one of a maturing market: Fleets are gaining confidence, adoption is spreading across more applications, and state leadership continues to shape where the transition is gaining ground fastest.
