UK Maritime ETS Implementation Framework and Compliance Deadlines Outlined

The United Kingdom has established the legal framework for its maritime Emissions Trading Scheme (ETS), introducing a company-level compliance regime for vessels of 5,000 gross tonnage and above. Starting July 1, 2026, operators on domestic UK voyages must monitor and report emissions of carbon dioxide, methane, and nitrous oxide through a new digital platform. This transition represents a significant shift from previous reporting structures and creates a complex regulatory environment for shipowners operating across both UK and European waters.

Eirik Nyhus, director of environment for maritime at DNV, highlights that the UK ETS moves beyond simple reporting to a full compliance regime involving monitoring, verification, and the surrender of allowances. Initially targeting cargo and passenger ships over 5,000 gross tonnage (GT), the scheme will expand to include offshore vessels starting January 1, 2027. A distinctive feature of the UK model is the requirement for a company-wide Emissions Monitoring Plan (EMP) rather than vessel-specific documentation. This EMP must be submitted via the digital Maritime Emissions Trading Scheme (METS) platform no later than 42 days after a company begins activities within the scheme's scope.

The scheme covers emissions from domestic voyages between UK ports, including port stays and emissions generated during port calls even on international routes. Specific provisions apply to Northern Ireland, where voyages to Great Britain require a 50% allowance surrender, though port stays in both locations remain subject to 100% surrender. The transition period involves the revocation of the previous UK Monitoring, Reporting and Verification (MRV) framework on April 3, 2026, with no reporting obligations until the new ETS structure begins on July 1, 2026. For this inaugural period, operators must report emissions through December 31, 2026, with the first surrender deadline set for April 30, 2028, covering both 2026 and 2027 emissions.

Responsibility for compliance lies primarily with the registered owner but can be transferred to the International Safety Management (ISM) company through a legally binding agreement. Unlike the EU ETS, the UK system does not require a physical Document of Compliance to be carried on board, relying instead on digital verification through the UK ETS Registry. However, Nyhus notes that several operational uncertainties remain, particularly regarding fuel eligibility, the recognition of voluntary certification schemes, and the alignment with the EU’s Renewable Energy Directive (RED). While the UK and EU are negotiating potential alignment of their trading systems, such a move is not expected until at least 2028, leaving shipowners to navigate a dual-regime environment in the interim.