UK Carbon Trades Wide to EU ETS for Structural Reasons Iran Headlines Cannot Fix
The UK-EU carbon spread reflects sectoral policy gaps that remain in place regardless of how Middle East tensions resolve.
The ICE EUA Dec contract was priced at €82.21 per tonne as of August 30, with UK allowances at £58.84, a gap of roughly €13 per tonne at the current 1.17 GBP/EUR exchange rate, extending a discount that Argus Media traced to structural divergences already apparent in Q1.5
Carbon traders on both sides of the channel have spent most of 2026 reading the two markets as one. The ICE EUA Dec-26 contract surged to EUR 78.35/t on Tuesday (2026-05-26), its highest since February, after reports of fresh US strikes on Iran, with EU and UK allowances both reaching three-month highs that session, Montel reported. By Monday (2026-06-08), EUAs had reversed, sliding to a two-week low as Iran tensions resumed alongside a full primary auction week, per Montel. UK allowances moved in tandem in both directions.2,3
The synchronised trading obscures a structural mismatch. Argus Media reported in April 2026 that UK ETS maritime inclusion only began in July 2026, and then solely for domestic voyages; international maritime remains excluded until at least 2028. The UK Carbon Border Adjustment Mechanism has not launched. Aviation lost its free allocations this year, a narrow increment against broader coverage gaps that persist. Each limit reduces the demand base for UKAs in ways that have no EUA equivalent.5
Consensus positioning is bearish on both instruments, with bearish signals outweighing bullish ones by roughly two to one. The dominant logic is that Iran risk-off drags carbon lower in the short run, and risk-on briefly lifts it. That reads correctly for weekly oscillations. Applying the same framework equally to both contracts ignores that UKA demand has more unfilled policy gaps than its EU counterpart.1
Oil markets have reinforced the Hormuz risk channel since July. ICE Brent front-month crude climbed 3.05% to $90.79 per barrel in late trading on Monday (2026-07-13), as US and Iranian forces expanded attacks and restricted energy shipments through the Strait of Hormuz, The Hindu BusinessLine reported. Front-month prices had already gained 15.9% in the week of July 6-12 (2026), the biggest weekly advance since April. ICE Brent front-month stood at $88.10 per barrel as of August 30.4
Sustained Hormuz disruption tightens Atlantic LNG flows and pushes ICE Endex TTF front-month higher. When gas costs rise, coal becomes more competitive in European power generation. Coal-fired generation requires more carbon allowances per megawatt-hour than gas, so power-sector EUA demand rises as the generation mix shifts. UKAs, with maritime still only partially covered and no active border carbon mechanism, have a shallower version of that same demand driver and may not keep pace with any TTF-driven EUA rally.4,5
Bearish consensus positions both contracts identically. That works when geopolitical sentiment is the only input. When structural factors diverge, as Argus noted they did through Q1 and as the current sterling-adjusted spread suggests continues into Q3, the two markets warrant separate analysis.5
Watch whether any TTF front-month rally in September drives EUAs while UK allowances lag. A sterling-adjusted EUA-UKA spread held above €13 while both markets are trading on energy-complex strength rather than pure risk-off sentiment would indicate that policy gaps, not geopolitics, are now setting the UK discount floor.4,5