The U.S. Environmental Protection Agency is issuing a request for information from school bus industry stakeholders as it seeks to add biodiesel, renewable diesel (RD) and liquefied natural gas (LNG) as funding options to a revised Clean School Bus Program.

Thursday’s RFI also mentions hydrogen as an eligible fuel listed by the Investing in Infrastructure and Jobs Act, which created the five-year, $5 billion fund. But there are currently no hydrogen school buses in production. The same goes for liquefied natural gas, which differs from propane. The IIJA also mentions CNG, which won a handful of awards, but manufacturers don’t currently produce that fuel option, either.

Diesel-powered school buses do exist in large numbers nationwide, estimated at about 80 percent of the national fleet of approximately 450,000 vehicles. Many operate with biodiesel blended with regular diesel. The RFI specifically states EPA seeks information on B20, or 20 percent biofuel blend with diesel.

Renewable diesel, or RD, is different from biodiesel as the former is produced by a hydrotreating process, making it a hydrocarbon fuel. Because it is otherwise nearly identical to petroleum diesel, RD is a drop-in fuel alternative that diesel engine manufacturers certify for use in their engines without voiding warranties. But RD is more expensive than petroleum diesel except in California, Oregon, New Mexico and Washington, where Low Carbon Fuel Standard credits are at play.

Electric school buses are not a focus of the RFI because EPA said it has sufficient information on its infrastructure, availability and performance.

EPA added electric school buses have accounted for 90 percent of Clean School Bus Program awards to date, and the next funding round should target other allowed alternative fuels “to allow for the maximum number of affordable bus choices to fit school districts’ specific needs.”

What’s in the RFI?

EPA is asking the current availability and anticipated purchasing within the next year to five years of biodiesel, RD, E85 flex fuel, CNG, LNG, propane or any other biofuel and if those school buses are fueled at the school district facility, an offsite private fueling station, or an offsite public station. EPA also wants to know about fuel supplier arrangements.
Specifically for biodiesel and RD, EPA is asking for details on how the blends or drop-in fuels are used.

It requests information on fueling system components, pricing, construction and installation requirements, performance, domestic content, and other practical considerations.

The RFI also states EPA wants information on how it can further safeguard taxpayer dollars. The agency completed an internal review to assess financial management practices and said it uncovered inconsistent documentation, incomplete adherence to reporting an award conditions, improper or premature drawdowns of funds, and insufficient internal controls by certain awardees, including for profit recipients.

EPA said it is “evaluating additional safeguards and conditions for for-profit entities,” which includes audits of financial statements and conflict of interest policies. It is also considering verification tools or documentation to ensure appropriate bus usage and routes before funds are disbursed; milestone-based payment structures, reimbursement-only models, or phased disbursement mechanisms tied to verified delivery to reduce risk and improve accountability; and enforcement mechanisms such as repayment obligations or clawback provisions in cases of nonperformance, noncompliance, or misuse of funds.

The Clean School Bus Program is set to expire at the end of the current fiscal year, which would require the remaining $2 billion that has yet to be awarded needing to rollout over the next six months.

Public comments are due within 45 days of EPA publishing the RFI in the Federal Register. A webinar is scheduled for March 3.

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