Zero-Emission Bus Implementation Guidebook for California Transit Fleets

University of California Institute of Transportation Studies

April 2023

California is in the process of state and local efforts to reduce emissions of pollutants and climate-changing gases, particularly in the transportation industry, which has been experiencing challenges due to economic conditions and the ongoing global pandemic. To address the role of transit bus operations in meeting California’s aggressive greenhouse gas (GHG) and emissions, the California Air Resources Board (ARB) has implemented an ambitious Innovative Clean Transit (ICT) regulation that requires all public transit agencies to gradually transition to a 100 percent zero-emission bus (ZEB) fleet. Beginning in 2029, 100% of new purchases by transit agencies must be ZEBs, with a goal for a full transition by 2040.

This plan provides resources and advice for transitioning to a ZEB fleet, including deployment and performance assessments, supportive policies, fueling solutions, training practices for operations and maintenance, and grant program resources. Agencies outside of California can take also take advantage of this resource, which included federal and non-governmental training programs.