Analyst Brief September 14, 2026

H.R. 2140 — Diesel Emissions Reduction Act of 2025

Current Status

Introduced, referred to the Committee on Energy and Commerce

Executive Summary

H.R. 2140, the 'Diesel Emissions Reduction Act of 2025', is a straightforward reauthorization bill that extends the highly popular Diesel Emissions Reduction Act (DERA) program through 2029. The status quo authorization for DERA expired in 2024. By providing voluntary grants and rebates to fleet owners to replace or retrofit older, highly polluting diesel engines (such as school buses, port equipment, and heavy-duty trucks), this bipartisan legislation achieves significant public health and air quality improvements without imposing new regulatory mandates on industry.

Bill Data

Primary Sponsor

Ms. Matsui

Bill Number

H.R. 2140

Session

119th

Co-Sponsors

Mr. CalvertMs. PingreeMr. Langworthy
View on Congress.gov ↗

Arguments For

  • Bipartisan 'Carrot over Stick' Approach: DERA relies on voluntary financial incentives rather than heavy-handed EPA mandates, making it a rare environmental program that enjoys strong Republican support.
  • Economic Boon for Manufacturers: The program subsidizes the purchase of new, cleaner equipment, directly benefiting domestic heavy-duty engine manufacturers, truck dealers, and fleet operators.
  • High ROI for Public Health: Replacing legacy diesel engines drastically reduces localized particulate matter (PM) and nitrogen oxide (NOx) emissions, yielding massive public health benefits, particularly in communities near ports and freight corridors.

Likely Supporters

Diesel Technology ForumAmerican Lung AssociationTruck and Engine Manufacturers AssociationEnvironmental Defense Fund

Arguments Against

  • Fiscal Conservative Opposition: Reauthorizing the program signals continued federal spending, which hardline fiscal conservatives may oppose on principle during a time of high national debt.
  • Progressive 'Fossil Fuel' Critique: Some strict environmental advocates argue that DERA funds are often used to purchase newer, cleaner diesel or natural gas engines, rather than forcing a complete transition to zero-emission (electric) vehicles.

Likely Opponents

Hardline fiscal conservative groupsStrict zero-emission advocacy groups

📋 Key Provisions

  • Amends Section 797(a) of the Energy Policy Act of 2005 to extend the authorization of the diesel emissions reduction program.
  • Shifts the program's sunset date from 2024 to 2029, ensuring a five-year reauthorization window.
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Claim Analysis Page 2, Lines 4-5

Extends the program's authorization through 2029.

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"striking ‘‘2024’’ and inserting ‘‘2029’’"