New Hampshire Clean Diesel Grant Program
The New Hampshire Clean Diesel Grant Program funds projects to replace or retrofit diesel vehicles and equipment, reducing emissions and promoting cleaner technologies statewide.
Funder: New Hampshire Department of Environmental Services
Due Dates: October 20, 2026: Rolling monthly application deadline (next occurring)
Funding Amounts: ~$1,000,000 available; no minimum or maximum award; partial reimbursement (typical cost-share 25–60% grant depending on project type)
Summary: Competitive grant program supporting the replacement or retrofit of diesel engines and vehicles to reduce emissions and improve air quality in New Hampshire.
Key Information: Applications are due by midnight on the 20th of each month until funds are exhausted.
Description
The New Hampshire Clean Diesel Grant Program, administered by the New Hampshire Department of Environmental Services (NHDES) and funded by the EPA’s Diesel Emissions Reduction Act (DERA), provides competitive reimbursement grants for projects that reduce harmful diesel emissions. Eligible projects include the replacement or retrofit of diesel-powered vehicles, engines, and equipment, as well as the installation of idle reduction or aerodynamic technologies. The program’s goals are to improve air quality, reduce greenhouse gas emissions, and advance the adoption of cleaner technologies throughout New Hampshire.
