Zeroing in on Zero-Emission Buses

Updated annually, Zeroing in on Zero-Emission Buses (ZEBs) provides the number of funded, ordered, delivered, and/or deployed transit ZEBs within the United States. This definitive, data-driven report offers the only comprehensive nationwide ZEB dataset and delivers insights that inform market investment, accelerate technology deployment, and support strategic transit planning and decision-making. 

Latest Report

The latest Zeroing in on ZEBs report shows that zero-emission transit buses are a steadily expanding nationwide market. As of July 2025, more than 8,100 full-size and nearly 1,400 small ZEBs have been funded, ordered, delivered, or deployed, representing sustained double-digit growth despite procurement delays, supply chain constraints, and policy uncertainty. Adoption is spreading across regions, vehicle technologies, and use cases, signaling that transit agencies are making pragmatic, repeatable decisions regarding technology, infrastructure, and fleet modernization.

Insights

• Fleet growth: Full-size ZEBs topped 8,100, up 16% in 1 year; fuel cell buses surged 49% nationwide, and more than 1,000 new ZEBs were added despite supply chain constraints. 
• Market adoption: Agencies continue investing in zero-emission fleets, moving buses from pilots to long-term strategies despite long lead times and limited domestic manufacturers. 
• Geography: ZEB growth extends beyond coastal leaders into the Southeast, Midwest, and other emerging states, demonstrating nationwide adoption. 
• Technology mix: Agencies are diversifying propulsion technologies based on operational needs; battery-electric remains dominant, and fuel cell buses have gained traction. Small ZEBs support flexible service models across a variety of routes and operations. 
• Economic impact: Expanding ZEB deployments are creating market opportunities for vehicles, infrastructure, and workforce development while driving long-term operational benefits. 

Past Editions

Access the full library of Zeroing in on ZEBs reports.