Carbon - In Focus: UK ETS Widens Discount to EU in Q1

Why It Matters

A larger UK‑EU price gap raises compliance costs for UK emitters and delays the market efficiency gains expected from a future linkage, influencing investment in low‑carbon assets across Europe.

Key Takeaways

• Q1 UK ETS discount averaged £14.75/t (~$19) versus EU.
• Discount range widened from £6.85 to £25/t.
• Linkage talks stalled, delaying price convergence.
• EU supply-demand tightening contrasts with UK's relaxed market.
• US‑Iran conflict lifts EU carbon prices, widens spread.

Pulse Analysis

The widening discount between the UK and EU emissions trading schemes reflects divergent market fundamentals. In the first quarter, the UK front‑year price sat roughly £14.75 per tonne below its EU counterpart, translating to an $18‑$20 gap per tonne of CO₂e. Such a spread erodes the cost advantage for UK‑based generators and industrial firms, especially as the UK government maintains an additional £18/t carbon price support charge (about $23). Investors watch these differentials closely, as they signal where carbon‑intensive assets may become less competitive.

Linkage negotiations, once a hopeful bridge for price convergence, have lost momentum. Although the UK signaled active consideration of a link in early 2025 and both sides agreed on a common‑understanding framework, concrete steps remain absent. The EU’s legal groundwork, set out in mid‑2025, has not yet translated into a binding timetable, and political distractions—from the new UK prime minister’s domestic agenda to the ongoing US‑Iran conflict—have pushed the issue down the priority list. Should a linkage materialise, allowances would become fungible, potentially compressing the discount and stabilising carbon markets across the region.

Beyond policy, supply‑demand dynamics are pulling the two markets apart. The EU ETS faces tighter fundamentals as maritime and aviation sectors face full cost coverage from 2026, and free allocations under the carbon border adjustment mechanism are being phased out. In contrast, the UK’s maritime inclusion is delayed until 2028 and its CBAM does not launch until 2027, leaving a surplus of allowances and a more relaxed market. Coupled with the energy shock from the US‑Iran war, which has driven EU carbon prices higher alongside natural‑gas spikes, the divergence is likely to persist until clear linkage steps or significant regulatory shifts occur.