The Environmental Protection Agency has set out two options for redistributing biofuel blending obligations waived from the 2025 compliance year of the Renewable Fuel Standard, according to Biomass Magazine. The agency has not named a preferred path.

That silence leaves refiners, renewable diesel producers, and merchant blenders modeling both scenarios at once, while the 2025 compliance ledger keeps accumulating. The question now is which option EPA finalizes, on what timeline, and at what revised percentage standard.

What does reallocation change for obligated parties?

Under the RFS, EPA assigns annual percentage standards that obligated parties — primarily refiners and importers of gasoline and diesel — meet through blending or through the purchase of Renewable Identification Numbers. EPA retains waiver authority and has used it in past compliance years to reduce the effective volume obligation when the original target risked inadequate supply or severe economic harm.

A waiver removes volume from the program total. Reallocation, as EPA proposes it in the two options Biomass Magazine identifies, would return that removed volume to remaining parties through some mechanism — either by raising the percentage standard retroactively for 2025 or by issuing a supplemental obligation tied to the same compliance year.

For a refiner running a January-through-December compliance ledger, the practical effect is a shifting baseline. If option one raises the percentage standard, RIN costs rise proportionally across every gallon already moved. If option two issues a separate supplemental obligation, accounting treatment differs and the marginal cost curve bends at a different point.

Why does 2025 timing matter?

The 2025 compliance year began January 1. By the time EPA published the two options, obligated parties had accumulated months of position, with RINs already retired or banked against the original percentage standard. Any reallocation that adds obligations retroactively forces reconciliation against that ledger rather than a clean forward-looking adjustment.

Past annual rulemakings have included remand-driven adjustments and supplemental standards following court action. The pattern matters because it defines the agency's playbook: a draft proposal, a public comment period, and a final rule, all compressed against a year running out of months.

For merchant blenders and renewable diesel producers, the signal runs the other direction. Higher effective obligations pull RIN demand forward, which historically tightens RIN prices and supports renewable diesel margins. The two options differ in how steeply they pull that demand and over what compliance window.

What does the market need to see next?

The milestone that decides the outcome is the final rule, paired with its effective date and the specific compliance mechanism EPA selects between the two pathways. Until that filing lands, obligated parties must hold compliance models in both configurations and biofuel producers must price against an unresolved demand curve.

Biomass Magazine reports that EPA opened the proposal without endorsing either option. The public comment record will shape which pathway the agency finalizes and at what percentage standard. RIN markets typically reprice on the day a final rule drops, and the direction of that repricing depends on whether the agency chooses the percentage-standard route or the supplemental-obligation route.

What to watch

• The agency's selection between the two options in the final rule
• The revised percentage standard or supplemental obligation volume applied to 2025
• The compliance demonstration mechanism for retroactive reconciliation
• RIN price response following any final action
• Whether the agency extends the midyear revision pattern into the 2026 rulemaking