Congress extends $1B annual biodiesel subsidy through 2029 with no performance review.
S. 4408 — Supporting Energy and Economic Development (SEED) Act · Filed by Marsha Blackburn (R-TN) · Introduced Apr 28, 2026 · Referred to committee
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What it does
This bill extends federal tax credits for biodiesel and renewable diesel fuel producers and blenders through December 31, 2029 (five years beyond the current December 31, 2024 expiration). It also prevents double-dipping by blocking producers from claiming both the older biodiesel credit and the newer clean fuel production credit (section 45Z) on the same fuel.
Why we flagged it
The bill's operative mechanism is a straightforward five-year extension of existing federal income and excise tax credits for biodiesel and renewable diesel producers. It is not deceptive about what it does, but it is a narrow industry subsidy dressed in climate/energy language.
What the text implies
- The extension locks in $1/gallon federal subsidy through 2029, committing future revenue to a single fuel sector without requiring producers to demonstrate cost-competitiveness or climate impact per gallon.
- Double-benefit prevention (section 45Z coordination) may inadvertently favor older biodiesel producers over newer clean-fuel technologies by preserving the older credit's availability.
- No sunset review or performance metric: the bill extends credits without conditioning renewal on market penetration, carbon reduction targets, or fuel-price impact.
Section numbers refer to the bill text the analysis read — linked under Primary records below.
Who it affects
Biodiesel and renewable diesel are lower-carbon fuels, so extending credits may support climate goals and energy independence; however, the credits are direct subsidies to fuel producers with uncertain pass-through to consumer prices, and the bill primarily benefits a narrow industry sector rather than the broad public. The double-benefit prevention is a minor anti-fraud measure.
Who stands to gain
- biodiesel producers
- renewable diesel producers
- fuel blenders
- agricultural feedstock suppliers
Named in the bill
Internal Revenue Code of 1986, Section 40A (biodiesel credit), Section 6426 (excise tax credit), Section 6427 (payments for fuels), Section 45Z (clean fuel production credit), U.S. Department of Energy, U.S. Environmental Protection Agency
Where it stands
- Apr 28, 2026 — Introduced · Congress.gov: “Introduced in Senate”
- Apr 28, 2026 — 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
6 lobbying clients named this bill on 6 disclosure filings across 1 quarter, Jun 2026 to Jun 2026. Those filings disclosed $1,120,000 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 82% of bills with at least one filing.
Marsha Blackburn, the sponsor, reported $133,620 in PAC receipts in the 2026 cycle.
- American Trucking Associations — $720,000 on 1 filing
- Pilot Travel Centers LLC — $160,000 on 1 filing
- National Association of Convenience Stores — $110,000 on 1 filing
- Pilot Travel Centers, LLC — $50,000 on 1 filing
- Racetrac, Inc. — $50,000 on 1 filing
Lobbying Disclosure Act filings through Jul 20, 2026. A filing shows who paid to lobby on a bill it names, not what changed.
How this was measured
Analysis — Quorum's AI read the bill text published by Congress.gov (2,388 characters) on Jul 2, 2026. Section numbers in the findings refer to that text, linked below; transparency and hidden-provision scores are compared against the median of 16,222 analysed bills.
Status and sponsors — Congress.gov's bill record — actions, committee referrals and cosponsors — loaded nightly. The timeline shows status changes, not every procedural action.
Money — Senate Lobbying Disclosure Act filings whose specific-issue field names this bill for quarters ending Jun 2026 to Jun 2026. A filing's amount is reported whole beside the median number of bills a filing names; it is never divided across them. PAC receipts are FEC-reported contributions to the sponsor's candidate committee in the 2026 cycle.
As of — lobbying records through Jul 20, 2026 · page rendered 2026-10-20.
“Congress extends $1B annual biodiesel subsidy through 2029 with no performance review.” QuorumCivic. https://share.quorumcivic.app/bill/119/s4408 Report an error
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