The U.S. Environmental Protection Agency Office of Inspector General says lessons from the first Clean School Bus rebates and grant rounds should inform future funding, especially as $2.37 billion remains available.
EPA is expected to announce the next CSBP funding rounds later this month or in June.
Ask a transportation director what makes a clean school bus project successful, and the likely answer goes beyond the bus itself. Directors share the importance of coordinating with utilities, ensuring charging infrastructure is ready, managing vendor timelines, or tracking federal and state funds.
A new summary report from the EPA Office of Inspector General, released April 1, points to that same balancing act. The report stated that the EPA has made improvements to the CSBP since its first rebate round in 2022. Earlier weaknesses in application review, recipient verification and fund management should continue to inform how the agency awards future dollars.
The report reviewed five prior EPA Office of Inspector General reports related to the agency’s management of Infrastructure Investment and Jobs Act funding for the 2022 Clean School Bus Rebates program. It identified two overarching issues: The application and selection process, and the management of funds. The summary report does not include new recommendations, but the OIG said the findings could help guide EPA decision-making for future CSBP awards, especially as money is still on the table.
Congress provided $5 billion over five years through IIJA to replace older diesel school buses with cleaner models, including propane, compressed natural gas and zero-emission buses. EPA has described the program as a way to reduce emissions in buses, loading zones and the communities they serve.
Report Highlights Rebate, Grant Awards to Date
At the beginning of fiscal year 2026, the CSBP had $2.37 billion remaining. As of February, EPA said it intends to revamp the program and issued a Request for Information seeking input from fleet operators, manufacturers, school officials and energy producers. The comment period closed April 6. The 146 filed comments included those from all major OEMs, dozens of school districts and other concerned citizens.
As of last November, EPA had awarded $865 million through the 2022 rebate program to 368 school districts for 2,328 replacement buses. The 2023 grant program awarded $950 million to 65 recipients for 2,696 buses, while the 2023 rebate program awarded $815 million to 458 school districts for 3,241 buses. All awards leaning heavily toward electric school buses. Find the breakdown of fuel funding on STN’s Green Bus Resources page.
But the EPA Inspector General said the initial process lacked adequate controls to verify certain applicant and bus eligibility information. Prior reports found EPA did not require enough documentation to verify applicant identity or the accuracy of information submitted, and applicants were not required to directly attest to the truthfulness of their applications. The OIG also said the agency had not established verification protocols before awarding funds.
That matters for districts because federal clean bus projects often require coordination among multiple parties, including school systems, contractors, original equipment manufacturers, utilities and infrastructure providers. The OIG noted that some eligible contractors were allowed to apply or initiate applications on behalf of eligible entities without their knowledge.
Another concern centered on whether local conditions were adequately considered, particularly for zero-emission buses. Under the IIJA, EPA must consider factors such as route length and weather conditions when awarding clean school bus funds. The OIG said prior reports found EPA was not ensuring applicants seeking electric buses had suitable local conditions, and it also cited utility delays as a potential risk to timely deployment.
Fund management was another issue flagged by the OIG. The report said EPA did not adequately monitor bus deployment status or recipient use of 2022 rebate funds, despite previously committing to do so. It also found that 2022 guidance did not clearly indicated for recipients whether CSBP funds should be kept in separate accounts, whether interest could be earned on those funds, or how any interest could be used.
According to the OIG, some recipients kept CSBP awards in accounts that included other funds, which increased the risk that program money could be used for other purposes.
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EPA has since made changes. For the 2023 rebate round, the agency required electric bus applicants to submit a Utility Partnership Agreement verifying that districts had notified their local utility. EPA also updated guidance to require recipients to manage funds so they would not accrue interest, keep funds in separate accounts and use them only for eligible expenses. In 2024, EPA added a School Board Awareness Certification requiring applicants to verify that school boards were notified of intended program participation.
The OIG said EPA has completed corrective actions addressing several prior recommendations and was still implementing others. The report states that the agency had completed, or was in the process of implementing, corrective actions for all 11 prior recommendations reviewed.
EPA also reported taking additional oversight steps beginning in February 2025, including site visits to rebate recipients, reviews of concerns related to use of funds and weekly project status reports to the chief financial officer.
