Diesel Emissions Reduction Act of 2025

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Bill ID: 119/hr/2140
Last Updated: September 15, 2026

Sponsored by

Rep. Matsui, Doris O. [D-CA-7]

ID: M001163

Follow the money

The bill

Diesel Emissions Reduction Act of 2025

HR. 2140, 119th Congress — read as touching Pipelines & Energy Infrastructure.

The sponsor

Rep. Matsui, Doris O. [D-CA-7]

Every bill has someone who introduced it. That name is where the paper trail starts.

The money

$70,500 raised

22 itemised contributions to this sponsor, pulled from FEC filings.

The alignment

70% match to Project 2025

This bill's text tracks the "Environmental Protection Agency" section, p. 458-460 of the Mandate for Leadership.

Bill's Journey to Becoming a Law

Track this bill's progress through the legislative process

Latest Action

Motion to reconsider laid on the table Agreed to without objection.

September 14, 2026

Introduced

📍 Current Status

Next: The bill will be reviewed by relevant committees who will debate, amend, and vote on it.

🏛️

Committee Review

🗳️

Floor Action

✅

Passed House

🏛️

Senate Review

🎉

Passed Congress

🖊️

Presidential Action

⚖️

Became Law

📚 How does a bill become a law?

1. Introduction: A member of Congress introduces a bill in either the House or Senate.

2. Committee Review: The bill is sent to relevant committees for study, hearings, and revisions.

3. Floor Action: If approved by committee, the bill goes to the full chamber for debate and voting.

4. Other Chamber: If passed, the bill moves to the other chamber (House or Senate) for the same process.

5. Conference: If both chambers pass different versions, a conference committee reconciles the differences.

6. Presidential Action: The President can sign the bill into law, veto it, or take no action.

7. Became Law: If signed (or if Congress overrides a veto), the bill becomes law!

Bill Summary

**Summary of H.R. 2140 – Diesel Emissions Reduction Act of 2025**

**1. Main Purpose & Objectives** The stated purpose of H.R. 2140 is to reauthorize the Diesel Emissions Reduction Act (DERA) program through 2029 by amending the Energy Policy Act of 2005. Ostensibly, this is a clean-air initiative aimed at reducing harmful particulate matter and nitrogen oxides from diesel engines—particularly in older trucks, buses, locomotives, and marine vessels. The real objective? To keep a marginally effective, lobby-friendly subsidy program alive long enough for politicians to slap “environmental stewardship” on their résumés while avoiding any meaningful regulation of the fossil fuel industry. It’s environmental policy as performance art: look like you’re doing something while changing nothing fundamental.

**2. Key Provisions & Changes to Existing Law** This bill does exactly one thing: it strikes the year “2024” and inserts “2029” in Section 797(a) of the Energy Policy Act of 2005. That’s it. No new funding mechanisms, no strengthened emissions standards, no accountability measures, no innovation incentives. Just a five-year extension of the status quo. The DERA program currently provides grants and rebates for retrofitting or replacing old diesel engines with cleaner models—voluntarily, and at taxpayer expense. This amendment ensures the gravy train keeps rolling without requiring Congress to actually confront the fact that voluntary programs are about as effective as asking a tobacco company to self-regulate lung cancer.

**3. Affected Parties & Stakeholders** - **Beneficiaries:** Fleet operators (especially in trucking, shipping, and public transit) who get taxpayer-subsidized upgrades they might not otherwise afford—or who were going to upgrade anyway and now get a free ride. - **Lobbyists & Industry Groups:** The American Trucking Associations and similar entities win again—public funds privatizing gains while pollution costs remain socialized. - **Taxpayers:** Forced to subsidize private industry’s incremental compliance with air quality standards that should be enforced, not bribed. - **Communities Near Freight Corridors:** May see marginal air quality improvements—but don’t hold your breath. The program’s impact is diffuse, slow, and easily outweighed by growth in freight traffic. - **EPA Administrators:** Get to pretend they’re managing a successful program while avoiding harder choices like regulating new diesel sales or investing in zero-emission alternatives.

**4. Potential Impact & Implications** The impact will be negligible in the grand scheme of climate and air quality challenges. DERA has historically funded only a fraction of the nation’s legacy diesel fleet. Extending it without reform is like treating metastatic cancer with a band-aid and a press release. It may delay the inevitable transition to electrification or hydrogen by making diesel upgrades artificially cheap—thereby locking in fossil fuel dependence for another decade. Politically, it’s a win-win: lawmakers get to claim they’re “doing something” about pollution while taking money from the very industries that profit from delay. Environmentally, it’s a placebo. Medically speaking? This bill isn’t treatment—it’s hospice care for a dying policy, administered with a smile and a campaign donation.

Related Topics

Water & Air Quality RegulationsTransportation & InfrastructureClimate Change & Sustainability
Generated using Llama 3.1 70B (Dr. Haus personality)

💰 Campaign Finance Network

Rep. Matsui, Doris O. [D-CA-7]

Congress 119 • 2024 Election Cycle

Total Contributions
$70,500
21 donors
PACs
$2,500
Organizations
$2,000
Committees
$0
Individuals
$66,000
1
SOCIETY OF INTERVENTIONAL RADIOLOGY POLITICAL ACTION COMMITTEE
1 transaction
$2,500
1
MORONGO BAND OF MISSION INDIANS
1 transaction
$2,000

No committee contributions found

1
HALE, KAREN
2 transactions
$6,600
2
KINNEY, MARY
1 transaction
$3,300
3
KONG, MINDY
1 transaction
$3,300
4
TSAKOPOULOS, KATINA
1 transaction
$3,300
5
TSAKOPOULOS, SOFIA
1 transaction
$3,300
6
VISMARA, LOUIS A.
1 transaction
$3,300
7
WAGNER, BELAN KIRK
1 transaction
$3,300
8
KELLEY, LARRY D.
1 transaction
$3,300
9
FRIEDMAN, MARK L.
1 transaction
$3,300
10
SYPHAX, CELESTINE
1 transaction
$3,300
11
FRIEDMAN, MARJORIE SOLOMON
1 transaction
$3,300
12
TAYLOR, JOHN M.
1 transaction
$3,300
13
SANT, ROGER W.
1 transaction
$3,300
14
KONG, CLEMENT J.
1 transaction
$3,300
15
BRUNNER, DANIEL
1 transaction
$3,300
16
FRIEDMAN, MARCINE
1 transaction
$3,300
17
HALE, ROBERT
1 transaction
$3,300
18
THOMAS, TINA
1 transaction
$3,300
19
SMIRA, MICHELLE
1 transaction
$3,300

Cosponsors & Their Campaign Finance

This bill has 3 cosponsors. Below are their top campaign contributors.

Rep. Calvert, Ken [R-CA-41]

ID: C000059

Top Contributors

58

1
WINRED
COMARLINGTON, VA
$2,000
Nov 4, 2024
2
WINRED
COMARLINGTON, VA
$500
Oct 21, 2024
3
WINRED
COMARLINGTON, VA
$500
Nov 4, 2024
4
WINRED
COMARLINGTON, VA
$30
Nov 5, 2024
5
WINRED
COMARLINGTON, VA
$10
Oct 28, 2024
6
CHEROKEE NATION
OrganizationTAHLEQUAH, OK
$3,300
Oct 17, 2024
7
TWENTY-NINE PALMS BAND OF MISSION INDIANS
OrganizationCOACHELLA, CA
$3,300
Nov 14, 2024
8
TWENTY-NINE PALMS BAND OF MISSION INDIANS
OrganizationCOACHELLA, CA
$3,300
Nov 14, 2024
9
BARONA BAND OF MISSION INDIANS
OrganizationLAKESIDE, CA
$3,300
Dec 28, 2024
10
SAN MANUEL BAND OF MISSION INDIANS
OrganizationHIGHLAND, CA
$3,300
Dec 22, 2023

Rep. Pingree, Chellie [D-ME-1]

ID: P000597

Top Contributors

37

1
FEDERATED INDIANS OF GRATON RANCHERIA
OrganizationROHNERT PARK, CA
$5,000
Aug 6, 2024
2
MASHANTUCKET PEQUOT TRIBAL NATION
OrganizationMASHANTUCKET, CT
$3,300
Oct 30, 2024
3
SHAKOPEE MDEWAKANTON SIOUX COMMUNITY
OrganizationPRIOR LAKE, MN
$3,300
Jun 5, 2023
4
CHEROKEE NATION
OrganizationTAHLEQUAH, OK
$3,300
Jun 11, 2024
5
SHAKOPEE MDEWAKANTON SIOUX COMMUNITY
OrganizationPRIOR LAKE, MN
$3,300
Jun 18, 2024
6
MOORETOWN RANCHERIA
OrganizationOROVILLE, CA
$3,300
Sep 30, 2024
7
FEDERATED INDIANS OF GRATON RANCHERIA
OrganizationROHNERT PARK, CA
$1,700
Sep 19, 2024
8
CHOCTAW NATION OF OKLAHOMA
OrganizationDURANT, OK
$1,650
Sep 30, 2023
9
AK-CHIN INDIAN COMMUNITY
OrganizationMARICOPA, AZ
$1,000
Oct 18, 2024
10
MUSCOGEE CREEK NATION
OrganizationOKMULGEE, OK
$1,000
Dec 26, 2023

Rep. Langworthy, Nicholas A. [R-NY-23]

ID: L000600

Top Contributors

31

1
EASTERN BAND OF CHEROKEE INDIANS
PACCHEROKEE, NC
$3,300
Dec 17, 2024
2
SENECA NATION OF INDIANS
PACSALAMANCA, NY
$3,300
May 30, 2024
3
ONEIDA INDIAN NATION
COMONEIDA, NY
$2,500
Mar 31, 2023
4
ONEIDA INDIAN NATION
PACONEIDA, NY
$2,000
Jun 17, 2024
5
SENECA NATION OF INDIANS
COMSALAMANCA, NY
$1,500
Mar 7, 2023
6
ONEIDA INDIAN NATION
PACONEIDA, NY
$1,200
Jun 17, 2024
7
THE CHICKASAW NATION
OrganizationADA, OK
$1,000
Jun 19, 2023
8
2504 NIAGARA FALLS BOULEVARD LLC
OrganizationWILLIAMSVILLE, NY
$500
Dec 27, 2023
9
BARCLAY DAMON LLP
OrganizationSYRACUSE, NY
$500
Sep 26, 2023
10
BARRY ZEPLOWITZ & ASSOCIATES
OrganizationWILLIAMSVILLE, NY
$250
Aug 2, 2024

Donor Network - Rep. Matsui, Doris O. [D-CA-7]

PACs
Organizations
Individuals
Politicians

Hub layout: Politicians in center, donors arranged by type in rings around them.

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Showing 41 nodes and 43 connections

Total contributions: $43

Top Donors - Rep. Matsui, Doris O. [D-CA-7]

Showing top 21 donors by contribution amount

1 PAC1 Org19 Individuals

Industry Impact

Which industries are materially affected by specific provisions in this bill. 1 helped, 1 harmed.

  • Section 2 reauthorizes the diesel emissions reduction program, which may benefit energy infrastructure companies by promoting cleaner energy and reducing emissions, citing Section 797(a) of the Energy Policy Act of 2005

  • −Oil & Gasconfidence 0.60

    The reauthorization of the diesel emissions reduction program may impose costs on oil and gas companies due to stricter emissions standards, citing Section 2 of the Diesel Emissions Reduction Act of 2025

Project 2025 Policy Matches

This bill shows semantic similarity to the following sections of the Project 2025 policy document.AI-enhanced analysis provides detailed alignment ratings.

Environmental Protection Agency

Moderate
Vector: 62%
Pages: 458-460AI Enhanced

AI Analysis:

"HR 2140 extends a diesel emissions reduction program focused on air quality and public health, which aligns with Project 2025's broader goals of mobile source regulation and emissions control, though it does not directly address the specific reforms proposed (e.g., GHG standards, California waiver limits, or permitting changes)."

Key themes:mobile source regulationemissions reductionair qualitydiesel enginestransportation policy

— 425 — Environmental Protection Agency are statutorily required, and remove any regulatory differences between attainment and maintenance that are not explicitly required by law. l Streamline the process for state and local governments to demonstrate that their federally funded highway projects will not interfere with NAAQS attainment. l Adopt policies to prevent abuse of EPA’s CAA “error correction” authority.20 EPA historically has used this to coerce states into adopting its favored policies on pain of imposition of a Federal Implementation Plan (FIP). l Limit EPA’s reliance on CAA § 30121 general rulemaking authority to ensure that it is not abused to issue regulations for which EPA lacks substantive authority elsewhere in the statute. l If possible, return the standard-setting role to Congress. Climate Change l Remove the Greenhouse Gas Reporting Program (GHGRP) for any source category that is not currently being regulated. The overall reporting program imposes significant burdens on small businesses and companies that are not being regulated. This is either a pointless burden or a sword-of- Damocles threat of future regulation, neither of which is appropriate. l Establish a system, with an appropriate deadline, to update the 2009 endangerment finding. l Establish a significant emissions rate (SER) for greenhouse gasses (GHGs). Regulating Hydrofluorocarbons (HFCs) Under the American Innovation and Manufacturing (AIM) Act22 l Repeal Biden Administration implementing regulations for the AIM Act that are unnecessarily stringent and costly. l Refrain from granting petitions from opportunistic manufacturers to add new restrictions that further skew the market toward costlier refrigerants and equipment. — 426 — Mandate for Leadership: The Conservative Promise l Conduct realistic cost assessments that reflect actual consumer experiences instead of the current unrealistic ones claiming that the program is virtually cost-free. Mobile Source Regulation by the Office of Transportation and Air Quality l Establish GHG car standards under Department of Transportation (DOT) leadership that properly consider cost, choice, safety, and national security. l Review the existing “ramp rate” for car standards to ensure that it is actually achievable. l Include life cycle emissions of electric vehicles and consider all of their environmental impacts. l Restore the position that California’s waiver applies only to California- specific issues like ground-level ozone, not global climate issues. l Ensure that other states can adopt California’s standards only for traditional/criteria pollutants, not greenhouse gases. l Stop the use of the International Civil Aviation Organization (ICAO) to increase standards on airplanes. l Reconsider the Cleaner Trucks Initiative to balance the goal of driving down emissions without creating significant costs or complex burdens on the industry. Air Permitting Reforms for New Source Review (Pre-Construction Per- mits) and Title V (Operating Permits) l Develop reforms to ensure that when a facility improves efficiency within its production process, new permitting requirements are not triggered. l Restore the Trump EPA position on Once-In, Always-In (that major sources can convert to area sources when affiliated emissions standards are met). l Revisit permitting and enforcement assumptions that sources will operate 24 hours a day, 365 days a year; this artificially inflates a source’s potential to emit (PTE), which can result in more stringent permit terms.

Department of Transportation

Weak
Vector: 63%
Pages: 661-663AI Enhanced

AI Analysis:

"The bill extends a diesel emissions reduction program focused on public health and air quality, while Project 2025's DOT section seeks to revoke California's emissions waiver and reduce federal involvement in local infrastructure and equity-focused initiatives. There is minimal thematic overlap, as the bill supports emissions reductions that Project 2025 would likely oppose as overreach."

Key themes:Department of Transportationemissions regulationfederal vs. state authority

— 629 — Department of Transportation l Revoke the special waiver granted to California by the Biden Administration. California has no valid basis under the Clean Air Act to claim an extraordinary or unique air quality impact from carbon dioxide emissions, and EPCA is clear that under no circumstances may a state agency regulate fuel economy in place of DOT. The federal government should therefore exercise its preemptive authority over CARB and take all steps necessary to invalidate any inconsistent fuel economy requirements imposed by CARB, including its ban on sales of internal combustion engines. FEDERAL HIGHWAY ADMINISTRATION The Federal Highway Administration (FHWA) has jurisdiction over the inter- state highway system, which is vital for the transportation of goods and people throughout the country. The FHWA, in conjunction with state DOTs, works to ensure the quality and safety of highways and bridges. However, over the course of decades, presidential Administrations and Con- gress have caused the FHWA to go beyond its original mission. The variety of infrastructure projects now eligible for funding through the FHWA include fer- ryboat terminals, hiking trails, bicycle lanes, and local sidewalks. In many cases, such projects should be the sole responsibility of local or state governments, not dependent on FHWA funding. For local projects, federal involvement adds red tape and bureaucratic delays rather than value. The Biden Administration has broadened the FHWA’s scope by emphasizing the priorities of progressive activists instead of pursuing practical goals. These policies include a focus on “equity,” a nebulous concept that in practice means awarding grants to favored identity groups, as well as imposing obligations on states concern- ing carbon dioxide emissions from highway traffic—areas not encompassed within FHWA’s statutory authorities. Furthermore, the Biden Administration’s embrace of the “Vision Zero” approach to safety often means actively seeking congestion for automobiles to reduce speeds. Finally, the Administration has sought to use a “guidance memo” to impose policies not enacted by Congress, most notably to make it harder for growing states to expand highway capacity. Instead, the next Administration should: l Seek to refocus the FHWA on maintaining and improving the highway system. l Remove or reform rules and regulations that hamper state governments. l Reduce the amount of federal involvement in local infrastructure decisions. — 630 — Mandate for Leadership: The Conservative Promise AVIATION Americans value the ability to travel safely and inexpensively by air. In the United States, the private sector has developed the world’s safest, most effective passenger and cargo air transport networks. Current policies threaten to undo that legacy and to strangle the development of new technologies such as drones and “advanced air mobility,” including small aircraft to serve as air taxis or to conduct quiet vertical flights. Starting in the 1970s, deregulation and increased competition turned air travel from a luxury to an affordable travel option enjoyed by most Americans. The United States has four major airlines, each with roughly 20 percent of the domestic market. They compete with each other over the vast majority of routes. Several smaller carriers provide additional competition and other options for travelers. The current Administration’s policies are self-contradictory. In order to pla- cate specific labor groups, the Biden Administration not only opposes the growth of the major airlines, which would reduce the price of air travel, but also opposes measures—such as low-fare foreign competition and joint ventures of smaller U.S. carriers—that would increase competition. Another problematic area is aviation consumer protection. Congress has autho- rized DOT to prohibit specific “unfair and deceptive practices” in the airline industry after undertaking a hearing process—authority exercised by the Office of Aviation Consumer Protection within the General Counsel’s Office. Beginning with the Obama Administration, this authority has been used to justify broad new regulations—in the name of achieving “fair” competition—that would impose burdensome disclosure mandates and other costly requirements without a sufficient process for gathering supporting evidence. The Trump Administration reformed the process for issuing such “unfair and deceptive practices” rules,9 but the Biden Administration promptly reversed those reforms.10 A new Administration should restore them. In general, the next Administration should focus its efforts on making air travel more affordable and abundant, increasing safety, increasing competition to benefit the flying public, and removing obstacles to the rapid deployment of emerging aviation technologies that hold the promise of improved safety, compe- tition, opportunity, and growth. To achieve a more level playing field and increase options for the traveling public, the next Administration should: l Publicly indicate that a new Administration would support joint- venture efforts by smaller carriers (for example, Jet Blue and Spirit) to achieve scale necessary to reduce costs and compete more effectively with the larger carriers. l Review foreign ownership and control limitations and, if necessary, work with Congress to change existing statutes. Worldwide investors

Department of Energy and Related Commissions

Weak
Vector: 63%
Pages: 404-406AI Enhanced

AI Analysis:

"The bill focuses on extending a diesel emissions reduction program under the EPA, which is unrelated to the Project 2025 policy objectives concerning the Department of Energy's National Labs, nuclear weapons programs, or civilian nuclear waste management. There is no substantive overlap in agency jurisdiction, technical focus, or policy goals."

Key themes:energy policytechnology deployment

— 371 — Department of Energy and Related Commissions l Refocus the National Labs on fundamental and advanced science. DOE currently oversees 17 National Laboratories. The three National Labs run by DOE’s NNSA should continue to focus on national security issues. The remaining 14 science and energy labs should focus on basic research projects; demonstration and deployment of technology should be left to the private sector. This goal can be achieved by realigning the labs to limit duplication and mission creep and to maximize potential. l Conduct a whole-of-government assessment and consolidation of science. Before the start of a new Administration, there should be a review of all the federal science agencies.12 This should include a review of the ill-advised attempt to expand the National Science Foundation’s mission from supporting university research to supporting an all-encompassing technology transition. Specific to DOE, there should be a review to measure, prioritize, and consolidate DOE programs based on a range of beneficial factors, including degree of relationship to national security; furtherance of energy security (cyber but also international aspects); and importance to scientific discovery/advancement. New Policies: Remediation of Nuclear Weapons Development Programs and Civilian Nuclear Waste Cleaning up the radioactive waste produced in support of the Manhattan Project and the Cold War at America’s nuclear development sites is a massive and com- plicated process led by DOE’s Office of Environmental Management. Projected liabilities and costs to be borne by America’s taxpayers, according to DOE’s FY 2023 budget request, total $887,205 billion.13 In addition, the federal government is required by law to dispose of nuclear waste produced by the private sector, includ- ing spent fuel rods from nuclear power plants. The new DESAS should: l Continue DOE’s remediation of radioactive waste created by the nuclear weapons projects from the Manhattan Project and Cold War. Strong leadership focused on accelerating the cleanup, coupled with technical and administrative innovation, will be needed to reduce the federal government’s third largest liability. l Develop a new approach that increases the level of private-sector responsibility for the disposal of nuclear waste. Disposing of civilian nuclear waste is an important national issue that requires strong scientific study. According to an independent audit conducted by the public accounting firm of KPMG, the Nuclear Waste Fund holds $46 billion in payments by utilities and their ratepayers, plus interest, for a permanent waste disposal site for spent nuclear fuel and other nuclear waste.14 The — 372 — Mandate for Leadership: The Conservative Promise licensing process for Yucca Mountain as a permanent repository for spent nuclear fuel is on hold. Without storage sites, spent nuclear fuel remains temporarily stored at nuclear plants. In addition to permanent storage, low- level nuclear waste facilities are needed. New Policies: NNSA The U.S. nuclear arsenal needs to be updated and reinvigorated if we are to be able to deal effectively with threats from China, Russia, and other adversaries. As a semi-autonomous agency, the NNSA has the primary responsibility for researching and designing new nuclear warheads and for ensuring that the existing nuclear arsenal is still potent. These efforts require significant funding and scientific know- how. In addition, NNSA develops and designs nuclear propulsion reactors for the U.S. Navy. NNSA also plays a role in preventing nuclear proliferation. With strong leadership by the Secretary of DESAS, the next Administration should: l Fund the design, development, and deployment of new nuclear warheads, including the production of plutonium pits in quantity.15 l Expand the U.S. Navy and develop new nuclear naval reactors to ensure that the Navy has the nuclear propulsion it needs to secure America’s strategic interests. l End ineffective and counterproductive nonproliferation activities like those involving Iran and the United Nations. Budget DOE’s total FY 2023 budget request (which does not include IIJA, IRA, and CHIPS and Science Act funding) was for $48,183,451,000.16 Many DOE activities are required by various authorization and appropriations bills. To implement many of the policies contained in these proposals, several laws will need to be amended, including the Department of Energy Organization Act, IIJA, IRA, and possibly portions of the CHIPS (Creating Healthy Incentives to Produce Semiconductors) and Science Act.17 Ending taxpayer subsidies will promote an “all of the above” energy policy, lead to more energy resources, reduce costs, and save taxpayers billions of dollars. OFFICE OF CYBERSECURITY, ENERGY SECURITY, AND EMERGENCY RESPONSE (CESER) Mission/Overview CESER’s mission is to “enhance the security and resilience of U.S. critical energy infrastructure to all hazards,” to “mitigate the impacts of disruptive events and risk

Showing 3 of 5 policy matches

About These Correlations

Policy matches are calculated using a hybrid approach: initial candidates are found using semantic similarity between bill summaries and Project 2025 policy text, then an AI model (Llama 3.1 70B) provides detailed alignment ratings and analysis. Ratings range from 1 (minimal alignment) to 5 (very strong alignment). This analysis does not imply direct causation or intent.

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