Congress locks in clean-fuel subsidy through 2034, favoring U.S. producers

What it does

This bill modifies the federal clean fuel production tax credit (Section 45Z) in four ways: (1) it requires that fuel feedstocks be grown or produced in the United States to qualify for the credit, blocking foreign-sourced materials; (2) it excludes indirect land-use-change emissions from lifecycle greenhouse gas calculations, potentially raising the credit's value; (3) it extends the credit's expiration date from 2027 to 2034; and (4) it tightens the rounding threshold for emissions calculations from 0.1 to 0.01, making more fuels eligible. The primary beneficiaries are U.S. agricultural producers and domestic biofuel/clean fuel manufacturers; the primary losers are foreign feedstock suppliers and importers.

Why we flagged it

The bill's operative mechanism is a tax-credit modification that restricts eligibility to U.S.-sourced feedstocks and extends the credit's life by seven years. While framed as a clean-fuel incentive, the primary effect is to protect domestic agricultural and biofuel producers from foreign competition and to lock in a long-term federal subsidy.

What the text implies

• The U.S.-only feedstock requirement may reduce the efficiency of global supply chains and increase production costs for clean fuels, potentially raising consumer energy prices.
• Excluding indirect land-use-change emissions from lifecycle calculations may overstate the climate benefit of the credit, reducing its environmental integrity.
• Extension to 2034 commits federal revenue to this credit for nine additional years, crowding out other climate or energy investments.
• The tightened rounding threshold (0.1 to 0.01) expands the pool of eligible fuels, increasing the credit's cost to the Treasury.

Section numbers refer to the bill text the analysis read — linked under Primary records below.

Who it affects

The bill protects domestic agricultural producers and creates incentives for U.S.-based clean fuel production, which may support rural economies and domestic energy independence. However, the U.S.-only feedstock requirement and exclusion of indirect land-use-change emissions may increase fuel production costs and consumer energy prices, and the extended credit (to 2034) locks in a long-term subsidy that diverts federal revenue from other public priorities.

Who stands to gain

• U.S. agricultural producers and commodity suppliers
• Domestic biofuel and renewable fuel manufacturers
• Clean fuel production companies with U.S. operations

Named in the bill

Internal Revenue Code Section 45Z, U.S. Department of Agriculture, Environmental Protection Agency, U.S. agricultural sector, Biofuel and renewable fuel industry

Where it stands

6 cosponsors: 3 Democrats, 3 Republicans.

• Apr 10, 2025 — Introduced · Congress.gov: “Introduced in Senate”
• Apr 10, 2025 — Referred to Senate Committee on Finance · Congress.gov: “Read twice and referred to the Committee on Finance”

Dates and quoted wording are Congress.gov's action record; the timeline shows status changes, not every procedural step.

Money around this bill

3 lobbying clients named this bill on 4 disclosure filings across 2 quarters, Dec 2025 to Jun 2026. Those filings disclosed $1,220,000 in lobbying spend. A filing names 10 bills on average, so that figure is what each filing reported, not a share belonging to this bill.

More lobbying clients named this bill than 61% of bills with at least one filing.

Roger Marshall, the sponsor, reported $1,777,391 in PAC receipts in the 2026 cycle.

• United Airlines Inc — $1,110,000 on 1 filing
• American Coalition for Ethanol — $70,000 on 1 filing
• Clean Fuel Alliance "fka National Biodiesel Board" — $40,000 on 2 filings

Lobbying Disclosure Act filings through Jul 20, 2026. A filing shows who paid to lobby on a bill it names, not what changed.