New Hampshire Clean Diesel Program

The New Hampshire Clean Diesel Program, administered by the Department of Environmental Services (NHDES), is a partial reimbursement initiative funded by the EPA Diesel Emissions Reduction Act (DERA). With approximately $1,000,000 in available funding, the program seeks to protect human health and improve air quality by reducing diesel emissions. Eligible projects include the replacement of diesel-powered vehicles, engines, or equipment with cleaner alternatives—such as electric, propane, CNG, or hybrid units—as well as the implementation of EPA-verified idle reduction, aerodynamic, and low rolling resistance technologies. A critical requirement for replacement projects is the permanent scrappage of old units, which must be disabled by drilling a three-inch hole in the engine block and cutting the frame rails within 90 days of the new unit entering service. Applications are accepted on a rolling monthly basis, due by the 20th of each month, and are evaluated through a formal scoring system. Key evaluation factors include proposal clarity, project readiness, and the cost-effectiveness of NOx, PM2.5, and CO2 reductions. Bonus points are available for zero-emission technologies, specific alternative fuels, and projects benefiting high-poverty communities. Non-profit and private entities must pass a preliminary impact assessment before formal scoring. Because this is a reimbursement program, participants must cover all project costs upfront and provide proof of payment for reimbursement. Additionally, replacement units must remain in service for at least five years, and certain electrified infrastructure must comply with Build America Buy America (BABA) sourcing requirements.