The Renewable Natural Gas Incentive Act of 2025 adds a new, $1 per gallon‑equivalent RNG fuel credit to the Internal Revenue Code. It defines RNG as biomass‑derived compressed or liquefied gas produced by a registered producer and backed by a producer certification.
The bill also creates special rules for blended RNG, sets a domestic production requirement, and provides a payment mechanism through the IRS to deliver the credit to eligible sellers or users. The incentive is temporary, ending December 31, 2035, and is supported by amended registration and energy‑equivalency provisions to ensure the credit targets U.S. RNG supply and uses.
At a Glance
What It Does
Establishes a renewable natural gas fuel credit of $1.00 per gallon‑equivalent for RNG sold or used as fuel in motor vehicles, motorboats, or aviation, defined with a certification and domestic production framework.
Who It Affects
RNG producers registered under §4101(a), fuel suppliers and marketers, and end users (fleets) that deploy RNG as transportation fuel; includes limits on blended RNG and domestic sourcing requirements.
Why It Matters
Signals a concrete market incentive to scale RNG supply, reduce greenhouse gas emissions from transportation, and spur domestic energy jobs—while embedding certification and domestic‑origin safeguards.
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What This Bill Actually Does
The bill tightens the Internal Revenue Code to offer a new subsidy for renewable natural gas. It creates a new subsection (l) under Section 6426 with the RNG fuel credit, sets the credit at $1 per gallon‑equivalent, and defines RNG as biomass‑derived gas produced by a registered producer who provides a certification.
RNG can be counted when sold for use as a fuel or used directly by the taxpayer in motor vehicles, boats, or aircraft. The law also provides a framework for blended RNG credits, including conditions that a contract existed before blending, that the contract specifies the gallons, and that the producer provides the required certification.
The “gasoline gallon equivalent” is fixed at the energy content of 124,800 Btu for higher heating value.
The bill links the RNG credit to the broader tax code by amending registration rules (4101(a)) to include RNG producers, updates to prevent double benefits, and clarifications ensuring RNG produced outside the U.S. cannot be credited for use outside the U.S. It also adds a payment mechanism under §6427(e) to pay eligible recipients the RNG credit, and it places a sunset on the program for new credits beyond December 31, 2035. The effective date applies to fuel sold or used in calendar quarters beginning after enactment.
Overall, the measure is designed to incentivize RNG production and use while ensuring domestic origin and proper certification, with a clear end date to manage fiscal exposure.
The Five Things You Need to Know
The RNG fuel credit is $1.00 per gallon‑equivalent for RNG used as fuel in vehicles, boats, or aviation.
RNG must be biomass‑derived, produced by a registered producer, and accompanied by a producer certification.
Blended RNG can qualify if pre‑existing contracts specify the volumes and certification is provided.
No credit applies to RNG produced outside the United States for use outside the United States.
The credit is paid through a new mechanism and terminates after 2035.
Section-by-Section Breakdown
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Establishment of the RNG fuel credit
The bill inserts new subsection (l) into Section 6426, creating the renewable natural gas fuel credit. It sets the framework for calculating the credit as the product of $1.00 and the number of gallons of RNG (or gasoline gallon equivalents of nonliquid RNG) sold for use as fuel in a motor vehicle, motorboat, or aircraft. It also lays out the eligibility constructs for RNG, including the requirement that RNG be biomass‑derived, produced by a producer registered under §4101(a), and certified under a Secretary‑prescribed form.
RNG credit mechanics and definitions
Subsection (l) defines the RNG credit (1), the RNG itself (2) with eligibility criteria (biomass origin, registration, certification), the treatment of blended RNG (3) with conditions on preexisting contracts and certification (and a cap tied to contracted gallons) (4), and the definition of certification (5). Subsection (6) establishes the termination date, ensuring the credit applies only through 2035. Collectively, these provisions operationalize the credit, tying eligibility to traceable production and verified use.
Domestic production requirement
A new paragraph clarifies that no credit is available for RNG produced outside the United States for use outside the United States. This ensures the incentive targets domestic RNG production and domestic fuel markets, reducing cross‑border leakage of subsidies and aligning with “Made in America” energy goals.
Energy equivalency alignment
The statute is amended to incorporate RNG into the energy equivalency framework, ensuring RNG is properly treated alongside other alternative fuels for credit calculation, reporting, and regulatory alignment.
Credit payments mechanism
Section 6427(e) is amended to introduce a payment mechanism that, without interest, pays to the eligible person the amount of the RNG credit. The redesign includes a new subparagraph (3) and extends existing credit conforming amendments to incorporate RNG (including adjustments to alternative fuel credits and blended credits). The new framework enables Treasury to disburse RNG credits to qualifying sellers or users.
RNG producers recognized in registration
The registration framework under §4101(a) is expanded to include RNG producers, requiring these producers to register similarly to other second‑generation biofuel producers. This creates a traceable supply chain basis for credit eligibility and supports the certification requirement.
Effective date and quarter‑based applicability
The amendments apply to fuel sold or used in calendar quarters beginning after enactment. This ensures a near‑term ramp‑up for RNG credits and aligns credit availability with the quarterly tax reporting cycle.
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Explore Energy in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Registered RNG producers (under §4101(a)) gain a clear revenue pathway via the credit, supported by certification requirements that validate provenance and reliability.
- Fuel distributors and marketers receive a new incentive framework for RNG products, helping them align product offerings with cleaner fuel mandates.
- End users such as fleets operating motor vehicles, motorboats, and aircraft gain access to cost savings from RNG purchases and usage, accelerating fleet transitions away from conventional fuels.
- Biomass feedstock suppliers and biogas developers benefit from expanded demand for RNG feedstocks, supporting rural energy projects and job creation.
- State and local governments pursuing emissions reductions and clean air goals benefit from an accelerated transition to RNG in transportation.
Who Bears the Cost
- The U.S. Treasury/IRS bears the fiscal cost of credit payments to RNG producers and users.
- RNG producers must incur registration and certification costs to qualify for the credit.
- Distributors and marke ters incur administrative costs to document, verify, and maintain compliance with RNG certification and blending rules.
- Firms adapting operations to domestic RNG sourcing may face capital costs or supply‑chain realignments to qualify for the credit.
- The sunset of the credit in 2035 creates potential stranded investments for long‑term RNG projects.
Key Issues
The Core Tension
Balancing aggressive incentives to mobilize RNG production with fiscal discipline and robust oversight: generous, near‑term subsidy incentives risk unintended market distortions or misallocation of credits if certification or domestic‑sourcing safeguards are weak.
The RNG credit creates a fiscally meaningful incentive that hinges on domestic supply and verified production. The key tensions include ensuring that blending provisions cannot be gamed through loopholes, maintaining rigorous certification to prevent misrepresentation of RNG volumes, and managing the cost to the Treasury while encouraging investment in RNG infrastructure.
The domestic production requirement further concentrates supply within the U.S., which could affect cross‑border feedstock markets and project economics near borders. The 2035 sunset provides a cliff for policy makers and market participants, potentially impacting project financing, asset depreciation, and long‑horizon RNG investments.
The alignment with existing 45K biomass and related energy policies will require careful implementation to avoid double counting or misapplication of credits across fuels and markets.
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