EU ETS and FuelEU Maritime

Two obligations, one evidence base.

EU ETS places an allowance obligation on covered ship emissions. FuelEU Maritime limits the annual greenhouse-gas intensity of energy used on board. Their calculations answer different questions, even when they start with the same fuel records.

For an operator, the practical task is to preserve the connection between the fuel, its evidence and each reporting method. A supplier's emissions value cannot be carried unchanged into every calculation. Its boundary, unit, eligibility and verification scope must travel with it.

This guide compares the principal mechanisms. Apply the relevant ship type, route, port-of-call definitions, exemptions and reporting year before reaching a vessel-specific conclusion. [2] [3]

EU ETS and FuelEU compared

Sources: Commission ETS overview and FAQ [1–2], Commission FuelEU Q&A [3], EMSA [4] and Commission MRV/ETS guidance [5]. The table is a general comparison, not a complete applicability assessment.

The broad geographical pattern is similar: full coverage for intra-EU/EEA voyages and relevant port activity, and half coverage for voyages to or from third-country ports. ETS applies these shares to emissions; FuelEU applies its scope to energy. Specific exclusions and derogations must still be checked separately. FuelEU also includes separate requirements for relevant passenger and container ships to use shore power or qualifying zero-emission technology at berth from the applicable future dates. [4]

Name the emissions year.

The maritime ETS phase-in is often described using the year in which allowances are surrendered. That can obscure the year in which the emissions occurred.

Consequently, a 2026 surrender concerns 2025 emissions at the 70% phase-in share. Emissions occurring in 2026 fall under the 100% phase-in and include methane and nitrous oxide, with surrender in 2027. The percentages do not mean that the same proportion of a ship's worldwide emissions is automatically covered. [1]

FuelEU's first reporting year is 2025, followed by its verification and compliance steps in 2026. Its initial 2% intensity reduction is measured against the regulatory reference, not against each vessel's own previous performance. [3]

Why lower consumption and lower intensity differ

Consider two otherwise identical operating scenarios using the same fuel pathway and conversion technology. Assume unchanged emission factors and a 10% reduction in energy consumption in the second scenario.

• Absolute emissions: fall by 10% under these assumptions, reducing the physical quantity relevant to the ETS calculation.
• Intensity per MJ: remains unchanged because the fuel and technology factors are unchanged.
• FuelEU balance: may change with the energy quantity, but the efficiency improvement has not itself reduced the fuel's GHG intensity.

This is an original illustrative comparison. It excludes route changes, fuel switches and special regulatory adjustments. It does not calculate a vessel's allowance requirement or FuelEU compliance result.

The management question is therefore precise: did the measure change energy consumption, the lifecycle factor, the regulatory treatment, or several of these? Each effect needs its own evidence.

Keep the records connected.

1. Identify the underlying activity. Record the ship, reporting year, voyages, fuel quantities and energy basis.
2. Preserve the calculation boundaries. Keep onboard emissions distinguishable from lifecycle intensity and identify the applicable methodology.
3. Record eligibility separately. Retain the evidence supporting any special fuel treatment. A commercial description alone does not establish eligibility.
4. Assign responsibility. Identify the regulated company, verifier interface and contractual party bearing the cost. These roles can differ.
5. Close each obligation on its own terms. Retain the evidence of ETS surrender separately from the FuelEU verification and compliance outcome.

A FuelEU surplus does not become an EU allowance. Pooling under FuelEU does not discharge an ETS surrender obligation. Likewise, a contractual reimbursement changes who pays without changing the statutory calculation. [3]

Use the fuel-evidence checklist to organise the underlying claim before mapping it into each regime.

Where the Carbon Basel Accord fits

The book proposes connecting comparable measurement, interoperable carbon pricing and coordinated supervision. Its contribution is an architecture for managing the interfaces between systems. Existing EU ETS and FuelEU rules continue to determine actual compliance.

Any future recognition, crediting or settlement between regimes would require an authorised mechanism. A common dataset can support that discussion; it does not create legal interchangeability. The executive brief explains the proposed three-pillar framework.