UK ETS for Shipping: What the UK Emissions Trading Scheme Means for Vessel Operators

From 1 July 2026, shipping enters the UK Emissions Trading Scheme for the first time. Vessel operators trading into and around the United Kingdom now face a carbon-pricing obligation that did not exist before: monitor emissions, report them, and surrender allowances to cover them. The scheme starts narrow, covering domestic voyages and in-port emissions for larger vessels, but it signals a direction of travel that every operator serving UK ports needs to understand.

What Is the UK Emissions Trading Scheme (UK ETS)?

The UK ETS is the United Kingdom's domestic carbon-pricing mechanism. Operating since 1 January 2021, it sets a cap on greenhouse gas emissions from covered sectors and requires participants to buy and surrender allowances for each tonne of emissions they produce. The scheme is run by the UK ETS Authority, a partnership of the UK, Scottish, and Welsh governments and the relevant Northern Ireland department.

Maritime shipping was not part of the original scheme. In July 2023, the UK ETS Authority confirmed it would extend the scheme to domestic maritime, and that extension takes effect on 1 July 2026. From that date, qualifying ship operators must monitor and report their emissions and surrender allowances to cover them, in the same way power stations and industrial installations already do.

The emissions covered are not limited to carbon dioxide. The scheme captures CO2, methane (CH4), and nitrous oxide (N2O), calculated on a tank-to-wake basis.

Which Vessels and Voyages Are in Scope?

The 2026 scope is deliberately narrow, and understanding its boundaries is the first step to knowing whether the scheme applies to a given vessel.

From 1 July 2026, the UK ETS applies to:

• Cargo and passenger vessels of 5,000 gross tonnage (GT) and above.
• Emissions from domestic voyages between two UK ports, including voyages that start and end at the same UK port.
• All in-port emissions in the UK, including time spent at berth, moored, or at anchor.

Two boundaries matter. First, emissions from international voyages are not yet in scope. A vessel sailing from a UK port to a foreign port is captured only for its in-port UK emissions, not the voyage itself. The UK government consulted on including a share of international voyages, with that consultation closing in January 2026, so this boundary may move in future. Second, offshore ships of 5,000 GT and above, such as offshore construction, supply, and support vessels, are brought into scope slightly later, from 1 January 2027.

The 5,000 GT threshold is set to be reviewed in 2028, with the possibility of lowering it to capture smaller vessels.

What Do Vessel Operators Need to Do?

Compliance with the UK ETS follows the monitor-report-surrender cycle familiar from other emissions regimes. The obligation sits with the ship operator, not the owner or charterer by default.

Emissions Monitoring and Reporting

The first requirement is an Emissions Monitoring Plan (EMP), submitted by the operator to the regulator. The EMP lists the ships in the operator's fleet, their particulars, and their emission sources, and sets out how emissions will be measured. Operators then monitor emissions across the reporting year and submit a verified emissions report.

For the first period, running from 1 July to 31 December 2026, the verified emissions report is due by 31 March 2027. The corresponding allowances must be surrendered by 30 April 2028.

Recordkeeping and Audit Trails

Underpinning the reporting is disciplined recordkeeping. Emissions data must be captured accurately and consistently across every qualifying voyage and every port call, and it must be verifiable by a third party. Fuel consumption records, voyage logs, and port-time records all feed the emissions calculation, and gaps or inconsistencies in that data create compliance risk. Operators already maintaining structured MARPOL Annex VI and CII records will recognize the discipline, and the UK ETS adds another regime that draws on the same underlying voyage and fuel data.

How Digital Recordkeeping Supports Emissions Compliance

Accurate, auditable records are the foundation of every emissions regime, and the UK ETS is no exception. An electronic logbook system replaces paper record-keeping with structured, consistent, cloud-stored data, the kind of audit trail that verified emissions reporting depends on.

SPICA LogBook is an electronic logbook system that replaces traditional paper logbooks with a digital record-keeping platform for vessels of all types. While it is not a carbon-trading or emissions-verification tool, the structured, secure record-keeping discipline it supports is the same discipline that emissions regimes like the UK ETS require. For operators specifically focused on emissions data, ANS also offers a dedicated carbon emissions reporting service.

UK ETS vs EU ETS: Key Differences for International Operators

Operators already dealing with the EU Emissions Trading System should not assume the two schemes work identically. The EU ETS extended to maritime from 1 January 2024 and takes a broader approach: it covers 100% of emissions on voyages within the European Economic Area and 100% of in-port EEA emissions, plus 50% of emissions on voyages into or out of the EEA. The EU scheme phases in surrender obligations, reaching 100% of reported emissions from 2027.

The UK ETS, by contrast, begins with domestic UK voyages and in-port emissions only, with international voyages still under consultation. An operator trading between UK and EU ports may therefore face obligations under both schemes for different segments of the same voyage. In 2025, the UK and EU announced negotiations to link the two schemes, which could align allowances and prices in future, but for now they remain separate systems with different scopes.

Prepare for the UK ETS Before It Applies

The UK ETS extension to shipping is a first step, narrow in scope but firm in direction. Operators serving UK ports should confirm whether their vessels cross the 5,000 GT threshold, prepare an Emissions Monitoring Plan, and put the recordkeeping discipline in place now rather than at the reporting deadline. Browse SPICA LogBook for digital record-keeping, or contact American Nautical Services at +1 (954) 522-3321 or sales@amnautical.com for MARPOL publications and emissions-related resources.

Frequently Asked Questions

Here are answers to common questions about the UK ETS for shipping.

Does UK ETS apply to non-UK-flagged vessels?

Yes. The UK ETS applies based on vessel activity in UK waters and ports, not flag. Any qualifying vessel of 5,000 GT or above operating on UK domestic voyages or calling at UK ports is in scope, regardless of its flag state.

When does the UK ETS start applying to shipping?

The UK ETS extends to maritime from 1 July 2026 for cargo and passenger vessels of 5,000 GT and above. Offshore ships of 5,000 GT and above are brought into scope from 1 January 2027.

What happens if I don't comply with UK ETS reporting?

Operators that fail to monitor, report, or surrender allowances face civil penalties under the UK ETS enforcement framework. Accurate emissions monitoring and timely surrender of allowances are legal obligations, and the regulator can impose fines for non-compliance.

How is UK ETS different from the EU ETS?

The EU ETS covers a broader scope, including a share of international voyages into and out of the EEA, and has applied to shipping since January 2024. The UK ETS starts with UK domestic voyages and in-port emissions only from July 2026, with international voyages still under consultation. The two schemes are separate, though linkage negotiations are underway.