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The first FuelEU Maritime reporting period closed on 31 December 2025. Verified reports were due to the European Commission by 31 January 2026. For shipping companies operating vessels over 5,000 gross tonnes on EU and EEA routes, that deadline marked the opening of a compliance cycle that will tighten progressively through to 2050. The question those companies and their fuel suppliers now face is not whether to engage with the regulation. It is whether the fuels they are using or procuring carry the independent verification that FuelEU Maritime requires for those fuels to generate any greenhouse gas credit value at all.
For bio-based maritime fuel producers, traders, and blenders, the answer turns on one specific requirement: certification under a voluntary scheme recognised by the European Commission. RSB holds that recognition. This blog sets out what it covers, which maritime bio-based fuel pathways are eligible, how the certification process maps to FuelEU Maritime compliance, and where the market currently stands for producers and operators now operating under a live regulatory framework.
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What FuelEU Maritime Actually RequiresÂ
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FuelEU Maritime (Regulation EU 2023/1805) sets progressively tightening well-to-wake greenhouse gas intensity limits on ships over 5,000 gross tonnes operating in EU and EEA waters. The regulation entered full force on 1 January 2025. The intensity targets decline in defined steps: a 2% reduction by 2025 relative to the 2020 fossil reference value, 6% by 2030, 14.5% by 2035, and continuing through to 80% by 2050. Every tonne of fuel consumed on a covered voyage is assessed on its full lifecycle greenhouse gas performance, from production through to combustion.
For a bio-based fuel to count toward compliance, it must carry certification under a scheme the European Commission has formally recognised. FuelEU Maritime delegates what it terms “sustainability criteria” to the EU Renewable Energy Directive. In practice, this means independently verified traceability, feedstock origin, and lifecycle greenhouse gas savings criteria. Any fuel certified under a Commission-recognised RED scheme automatically satisfies those requirements under FuelEU Maritime, without additional verification steps.
The consequence for uncertified fuels is unambiguous. Uncertified bio-based fuels are assigned the worst-case fossil default emission factor under FuelEU Maritime, effectively disqualifying them from generating any greenhouse gas credit value and exposing operators to accumulating penalty costs. A fuel a producer or supplier describes as bio-based, but which carries no independently verified certification under a recognised scheme, does not exist as a bio-based fuel for FuelEU Maritime compliance purposes. It counts as fossil.
This is the compliance reality the first reporting cycle has now made concrete. Operators who relied on unverified bio-based fuel claims for their 2025 voyages are carrying that exposure in their first verified report. The 2026 reporting year is already underway.
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RSB’s Recognition and What It Covers  Â
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RSB holds formal recognition from the European Commission as a voluntary scheme under EU RED. That recognition covers biofuels, bioliquids, biomass fuels, biomethane and biogas, renewable fuels of non-biological origin (RFNBOs), and recycled carbon fuels (RCFs) across the full supply chain. Because FuelEU Maritime delegates to RED, RSB EU RED certification is a direct compliance gateway for maritime bio-based fuel producers and traders operating in EU and EEA markets.
RSB does not operate a standalone maritime programme. This is a precision, not a limitation. RSB Global Fuels Certification and RSB EU RED Fuel Certification apply to maritime fuels on the same basis they apply to aviation or road transport fuels: feedstock origin, production process, chain of custody, and lifecycle greenhouse gas performance determine eligibility. The end use does not.
This means bio-LNG, bio-methanol, and bio-DME intended for maritime use can be certified under RSB’s existing schemes today, provided they meet the applicable requirements. The certification pathway is open. No maritime-specific scheme is required.
One further distinction matters for how RSB certification scope is understood. RSB certification is not limited to regulatory recognition or greenhouse gas methodology alone. Those are thresholds RSB meets. They are not the ceiling RSB operates at. Certification under RSB requires independently verified performance across environmental, social, and governance dimensions simultaneously: land rights, food security, water, biodiversity, and human rights are assessed alongside carbon. That multi-criteria scope is what no compliance-only framework can replicate, and it is the primary reason RSB certification withstands scrutiny that single-metric schemes do not. Â
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Eligible Bio-Based Maritime Fuel Pathways  Â
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Three fuel pathways are of primary relevance to the maritime sector under RSB certification.
Bio-LNG, produced from eligible waste and residue feedstocks through anaerobic digestion or gasification, is the most commercially deployed bio-based alternative in maritime bunkering. Several major northern European bunkering hubs handle bio-LNG volumes. Eligibility under RSB certification turns on feedstock origin: bio-LNG produced from landfill gas, agricultural residues, or food waste qualifies where chain of custody and greenhouse gas performance requirements are met. Feedstocks that trigger land-use change or originate from high-carbon-stock land do not qualify regardless of the final greenhouse gas calculation.
Bio-methanol, produced from biogenic feedstocks including black liquor, municipal solid waste, or agricultural residues, is attracting growing interest from dual-fuel vessel operators. Several major shipping groups have committed to methanol-ready newbuilds. RSB certification applies where bio-methanol is produced through a pathway demonstrating qualifying greenhouse gas savings on a lifecycle basis and meeting feedstock origin requirements under RSB’s Principles and Criteria.
Bio-DME (dimethyl ether of biogenic origin) remains at an earlier commercial stage but is technically eligible under RSB’s fuel certification framework where derived from certified biogenic syngas pathways. The certification pathway exists; commercial deployment at scale has not yet materialised.
In each case, eligibility is determined at the level of the individual production pathway, not the fuel type. Two bio-LNG producers using different feedstocks, different production processes, and different supply chains may produce fuels with materially different greenhouse gas profiles. RSB certification resolves this by requiring pathway-level, independently verified assessment rather than fuel-category assumption.
RSB certification applies to the production and trade of the fuel, not to the vessel or the shipping company purchasing it. A shipping operator does not become RSB-certified by procuring certified fuel. The certification status belongs to the fuel producer and to each subsequent entity in the chain of custody. The operator’s compliance benefit is the independently verified documentation that certified fuel carries into their FuelEU Maritime submission.
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How RSB Certification Maps to FuelEU Maritime ComplianceÂ
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The compliance chain works as follows. A fuel producer seeking to supply independently verified bio-based marine fuel for EU voyages engages an RSB-accredited Certification Body to audit their production pathway against RSB’s Principles and Criteria and the corresponding EU RED RSB Standards and Procedures. That audit covers feedstock origin, lifecycle greenhouse gas performance, chain of custody integrity, and RSB’s full twelve-criteria scope including land rights, water, biodiversity, and human rights. Where the pathway meets the requirements, the producer receives RSB EU RED certification and registers their fuel in the EU’s Union Database for Biofuels.
A shipping operator procuring that fuel receives the certified fuel documentation confirming it meets the EU RED traceability and independently verified performance criteria required by FuelEU Maritime. That documentation is what the operator integrates into their well-to-wake greenhouse gas intensity reporting. The certified fuel counts toward compliance. An uncertified equivalent does not.
Two qualifications remain important for operators and producers working through this process. First, RSB certification covers the fuel production pathway. Completing the FuelEU Maritime compliance submission requires the shipping operator to integrate certified fuel documentation into their broader well-to-wake reporting, which involves additional data collection steps. The certification is necessary but not the entirety of the compliance process. Second, national transposition of RED III across EU member states continues to evolve. Producers and operators should verify current requirements with their compliance advisors as transposition proceeds.
For maritime operators on non-EU routes or operating under flag states that have not adopted RED-aligned frameworks, RSB’s Global Fuels Certification provides an equivalent multi-criteria, independently verified framework without the RED-specific requirements.
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Where the Market Currently Stands  Â
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RSB’s certification framework is open for maritime bio-based fuel pathways today. The standards apply. The eligible pathways are defined. The Commission recognition under EU RED is in place..
The regulatory conditions that make certification commercially necessary are live. The first FuelEU Maritime reporting cycle has closed. Producers and operators evaluating their position for 2026 are doing so with full knowledge of what unverified fuel claims cost in a compliance submission.
Future RSB maritime bio-based fuel producers to certify under RSB will hold a demonstrably compliant, regulatorily recognised position ahead of the field. Their fuel will carry independently verified documentation that translates directly into a shipping operator’s FuelEU Maritime submission. The shipping operators procuring certified fuel will minimise the risk of non-compliance. In a market where penalty exposure is accumulating and the first reporting cycle has already passed, that position has direct financial value.
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What This Means for Producers and Operators Now   Â
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For bio-based maritime fuel producers, the practical steps are three. First, assess whether the production pathway qualifies: feedstock origin, lifecycle greenhouse gas savings, and chain of custody model must meet RSB’s requirements before a certification application proceeds. RSB’s Advisory Services team can support this assessment. Second, engage an RSB-accredited Certification Body to conduct the audit against the applicable RSB standard. Third, register the certified fuel in the Union Database for Biofuels where EU RED compliance is required.
For shipping operators, the procurement question is immediate: does the bio-LNG, bio-methanol, or bio-DME being sourced for EU voyages carry valid certification under a Commission-recognised RED scheme? If not, the fuel claim is an assertion rather than a regulatorily recognised, independently verified position. In a FuelEU Maritime compliance submission covering the 2026 reporting year, that distinction carries direct financial and legal weight.
With the 2025 reporting cycle closed, and the 2026 cycle well underway, producers and operators without independently verified certification for their maritime bio-based fuel pathways are already operatingin a live compliance gap.
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The Framework Is Ready. The Reporting Cycle is Live.    Â
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FuelEU Maritime is not an approaching deadline. It is an active compliance framework with its first verified reports already submitted. For bio-based maritime fuels to count toward compliance on EU and EEA voyages, they must carry independent certification under a Commission-recognised RED scheme. RSB holds that recognition. The eligible pathways cover bio-LNG, bio-methanol, and bio-DME. The certification framework is open for operator uptake today.
For organisations evaluating their position on maritime bio-based fuel certification, the starting point is a pathway assessment. Visit RSB EU RED Fuel Certification overview to understand eligibility requirements and next steps, or apply for certification directly.
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