EU & UK ETS: why geopolitical shocks reinforce the long-term carbon price floor

Headlines around the late-February escalation in the Middle East and the disruption risk to the Strait of Hormuz — through which roughly 25% of seaborne oil and around 20% of global LNG transits [1] — have generated the usual narrative of carbon-market dislocation. The more useful read is the opposite: the EU and UK Emissions Trading Schemes are absorbing a textbook supply-side energy shock without breaking, and the structural reforms now baked into both systems mean each volatility event functions less as a threat to the carbon price and more as a stress test of an increasingly tight market. For compliance buyers, project developers and Article 6 host countries, the present window is constructive, not defensive.

What actually happened in February and March

EUAs and UKAs both sold off through February as investor-fund length unwound and reform-debate headlines (including Net-Zero target consultations and EU–UK linkage discussions) reduced near-term risk appetite. The Middle East flare-up on the final day of February then triggered a sharp two-day move in European TTF gas and UK NBP gas prices, with day-ahead gas more than doubling at the peak. EUAs traded a wider intraday range but held above key technical support; UKAs widened their discount to EUAs to more than £19/t before stabilising. Importantly, neither auction was undersubscribed and clearing prices remained orderly — the hallmark of a market repricing rather than one losing functional liquidity.

Why the EU ETS is structurally insulated

The post-Fit-for-55 EU ETS is a much tighter system than the one that absorbed the 2022 energy crisis. The Linear Reduction Factor was raised to 4.3% for 2024–2027 and 4.4% from 2028, a one-off rebasing cut total allowances issued, and the cap now reaches zero in the 2030s rather than the 2050s under the original trajectory [2]. The Market Stability Reserve continues to withdraw 24% of the surplus annually through 2030 — in 2024 alone the MSR absorbed 264.7 Mt of allowances from auction volumes [3]. On top of this, CBAM enters its definitive phase on 1 January 2026, with importers required to surrender CBAM certificates priced off the weekly average EUA price [4]. Each of these is a slow-moving, legislated tightening that does not reverse when gas prices spike. A short-run gas-to-coal switch raises power-sector emissions and EUA demand precisely when the MSR is still withdrawing supply — a combination that supports prices over the cycle even if intraday volatility increases.

The UK ETS: discount is an opportunity, not a verdict

The wider UKA–EUA spread reflects two transitory issues — political headline risk around linkage and the UK's full coal phase-out reducing the marginal abatement response to gas price moves — not a structural weakening of the scheme. The UK ETS Authority has already legislated a tighter cap aligned to the Net Zero consistent trajectory, reducing the cap by around 30% from 2024 levels and front-loading reductions through 2027 [5]. The Authority's 2024 response confirmed expansion to domestic maritime (from 2026), waste incineration (from 2028) and engineered greenhouse-gas removals (GGRs) as compliance-grade supply and demand drivers [5][6]. Active UK–EU linkage discussions under the May 2024 Common Understanding add further upside: a linked market would mechanically compress the discount and is the single highest-conviction structural catalyst for UKAs over the 2026–2028 horizon [7].

Industrial hedging: the demand signal that gets missed

Volatility events of this type consistently pull forward industrial and utility hedging. CBAM-exposed importers (steel, cement, aluminium, fertiliser, hydrogen, electricity) now face direct EUA-linked cost pass-through from 2026 and are rationally extending forward cover earlier in the curve [4]. European utilities continue to hedge two to three years out under their standard policies, and the wider commodity volatility increases the value of locking in carbon cost certainty. The net effect is deeper liquidity further out the curve, better price discovery for 2027–2030 contracts, and a more investable forward strip for project developers selling into compliance-linked offtakes.

Constructive outlook across three horizons

Near term (2026): orderly repricing rather than dislocation; EUAs supported by MSR intake and CBAM go-live; UKAs supported by tighter Phase 2 cap and linkage optionality. Volatility is the cost of admission, not a structural problem.

Medium term (2027–2030): LRF acceleration, continued MSR withdrawals, scope expansion (maritime, waste, buildings/transport via ETS2, GGRs) and CBAM full-scope coverage drive a higher and less compressible price corridor [2][5]. UK–EU linkage is the single largest asymmetric upside catalyst for UKAs.

Long term (2030+): with the EU ETS cap reaching zero in the 2030s and UK ETS aligned to Net Zero, geopolitical shocks become demand-side accelerants for clean industrial investment rather than tail risks to the carbon price. The same logic transmits to Article 6.2 ITMO pricing, voluntary high-integrity supply (ICVCM CCP-aligned) and corporate Scope 3 procurement, all of which benchmark against the compliance complex.

Where CAS fits in

CAS works with compliance buyers, project developers and host-country authorities on the operational consequences of exactly this market environment. Concretely: (a) CBAM exposure modelling and embedded-emissions data pipelines for importers preparing for the 2026 definitive phase; (b) EUA/UKA forward-curve and policy-scenario inputs into hedging and procurement strategy, including UK–EU linkage sensitivity; (c) integration of compliance carbon cost into voluntary portfolio design and Article 6.2 ITMO sourcing strategy for corporates; and (d) for host-country DNAs, alignment of authorised-transfer pricing with the compliance reference complex so ITMO programmes remain commercially competitive through volatility cycles. We are an independent technical advisory — we do not trade allowances or take principal positions.

Sources

[1] U.S. Energy Information Administration, 'The Strait of Hormuz is the world's most important oil transit chokepoint'.

[2] European Commission, 'Revision for phase 4 (2021–2030) of the EU ETS' — LRF and cap trajectory under Fit-for-55.

[3] European Commission, '2024 Market Stability Reserve publication' (264.7 Mt to be withdrawn Sep 2024–Aug 2025).

[4] European Commission, 'Carbon Border Adjustment Mechanism (CBAM)' — definitive period from 1 January 2026.

[5] UK ETS Authority, 'Developing the UK Emissions Trading Scheme: Main Response', July 2023 — Net Zero consistent cap.

[6] UK Government, 'Expanding the UK ETS: domestic maritime, waste, GGRs', July 2025.

[7] European Commission & UK Government, 'Common Understanding on linking the EU and UK Emissions Trading Systems', May 2025.