EU ETS Maritime Enters Its 70% Surrender Year — With Methane and N₂O Newly in Scope

The EU Emissions Trading System's maritime chapter entered its second full compliance year on January 1, and the changes are not cosmetic. Methane (CH₄) and nitrous oxide (N₂O) emissions from maritime transport are now inside the allowance surrender mechanism for the first time, and the phase-in obligation has stepped up from 40 percent of 2024 emissions to 70 percent of 2025 emissions. The next surrender deadline falls in September 2026, and the European Commission confirmed after the first cycle that shipping companies surrendered allowances covering more than 99 percent of their 2024 requirements. Compliance was smooth on paper. The harder year starts now.

The methane inclusion is where the commercial pain concentrates. DNV and Lloyd's Register analysts have been flagging for months that LNG dual-fuel tonnage, previously the ETS darling, is now exposed to methane slip penalties that were invisible in the 2024 surrender cycle. At a 3.1 percent methane slip on a low-pressure two-stroke engine, the CO₂-equivalent hit can erode 15 to 20 percent of the LNG CO₂ advantage over VLSFO once the full GWP uplift is applied. High-pressure installations such as MAN ME-GI, which slip at under 0.2 percent, keep most of their advantage. Owners of the LP 2-stroke fleet have a narrow window to either document lower-slip performance through independent measurement campaigns or plan for the margin leak.

The allowance price picture is not helping. S&P Global Commodity Insights and the International Carbon Action Partnership both put the 2026 EUA average in the €85 to €95 per tonne range against a 2025 realised average of €72. At €90 per tonne and the 70 percent surrender phase, a 15,000 TEU Asia to Europe containership on the standard head-haul pattern faces an estimated €6.5 to 7.8 million annual EU-leg bill. The total allowance pool was increased to reflect the CH₄ and N₂O inclusion, but the 2026 auction calendar published by the Commission in December 2025 confirms the linear reduction factor still applies, so the cap tightens even as scope widens.

SAFETY4SEA reporting and legal briefings from Norton Rose Fulbright and Watson Farley & Williams point to the real contract-law problem. Most of the 2024 ETS surcharge clauses drafted under BIMCO's ETSS standard form fixed allowance pass-through at CO₂ only. Charterers reading their 2024 paperwork today can legitimately contest 2026 CH₄ and N₂O billings absent a contract amendment. Norton Rose advised operators in January to reissue surcharge notices referencing the revised Directive (EU) 2023/959 consolidated text and to renegotiate ETSS language before the September surrender cycle closes. Operators who miss that drafting window are looking at unrecovered allowance costs booked against their own accounts.

Enforcement is the quiet part. Germany's BAFA, France's DGEC and Spain's OECC run the compliance-check machinery, and the first enforcement referrals for 2024 under-surrenders are moving through Q2. Non-compliance triggers a €100 per tonne CO₂-equivalent penalty, an ongoing obligation to still surrender the underlying allowances, and publication of the non-compliant operator's name. For publicly listed carriers, the reputational line item is arguably more expensive than the allowance line item.

What this means for operators. Anyone banking on LNG dual-fuel as a compliance hedge needs a fresh methane-slip measurement campaign before Q3. Any charterer drafting 2026 time charters needs revised ETSS language that explicitly names CH₄ and N₂O. And any operator with 2025 MRV emissions already in Thetis MRV should run the 70 percent math now, not in August. The first compliance cycle rewarded the well-prepared. The second will expose where the pass-through clauses leak.