European Carbon Prices Recover as US Rejects Iran Peace Proposal and ECB Rate Hike Looms

European Carbon Prices Recover as US Rejects Iran Peace Proposal and ECB Rate Hike Looms EUA prices jumped on geopolitical risk while the euro weakened to $1.16 as energy-driven inflation hit 3% in April. European carbon prices recovered after an initial decline following the United States' rejection of Iran's latest peace proposal over the weekend, then made strong gains in the afternoon as positive fundamental sentiment spread amongst traders. UKA prices also jumped to a three-month high, Carbon Pulse reported.³ The move matters because carbon pricing sits at the intersection of every force currently shaping European energy markets: geopolitical risk, inflation expectations, central bank policy, and the coal-to-gas switching economics that the Hormuz crisis has thrown into disarray. The euro dropped below $1.16, its lowest since early April, as investors prepared for sustained high energy prices driven by the Middle East conflict. Brent crude held near four-year highs with US-Iran talks to reopen the Strait of Hormuz stalling. The EUR/USD exchange rate fell to 1.1594 on May 20, down 0.10% on the session. Over the past month, the pair has weakened 1.27%, though it remains up 2.31% over the past year. Trading Economics models project EUR/USD at 1.17 by the end of the quarter.² The macro picture for Europe is deteriorating under the weight of energy costs. Eurozone growth slowed to 0.1% in Q1 2026, the weakest since Q2 2025, amid Middle Eastern energy constraints. Inflation climbed to 3% in April, the highest since September 2023 and well above the ECB's 2% target. The combination of stagnant growth and rising prices is the textbook stagflation scenario that central bankers dread.² Expectations for ECB tightening have intensified. Markets are pricing in an over 80% chance of a 25-basis-point rate hike next month and two more by year-end. The ECB already confirmed a widely expected 25 basis point increase, and the Stoxx 600 closed down 0.45% on the day as investors digested the hawkish trajectory.^2,4 Equity markets reflected the uncertainty. The FTSE 100 was down 20.42 points, or 0.3%, at 7,702.13. The FTSE 250 fell 76.27 points, or 0.4%, to 19,410.26. In continental Europe, the CAC 40 in Paris was up 0.1% while the DAX 40 in Frankfurt was up marginally. The divergence between French and German equities and the UK reflects different exposures to the energy shock and monetary policy paths.¹ US futures pointed lower, with the Dow Jones Industrial Average called down 0.2%, the S&P 500 down 0.4%, and the Nasdaq Composite down 0.5%. Japan's Nikkei 225 closed up 0.7%, continuing to outperform Western markets.¹ The semiconductor sector dragged European markets after Trump left China without announcing any major tech deals. The US delegation including CEOs from Nvidia, Apple, and Tesla had given investors hope for significant agreements. The disappointment weighed on chip stocks across Europe.⁵ For energy traders, the carbon market recovery is the key signal. EUA prices rising on a rejected Iran peace proposal tells you the market is pricing in prolonged Hormuz disruption. Higher carbon prices compress the economics of coal-to-gas switching at exactly the moment European utilities are being pushed toward coal by gas prices. The two forces work against each other. The Bank of Japan's decision to raise its short-term policy rate to a range of 0.0% to 0.1%, from minus 0.1% previously, adds another variable. Japanese monetary normalisation strengthens the yen, which affects LNG procurement costs for Japanese utilities and indirectly influences global gas trade flows.¹ The signal to watch is whether UKA prices hold their three-month highs into next week, and whether the ECB's hawkish stance accelerates the euro's decline below $1.16. A weaker euro makes dollar-denominated energy imports more expensive for European buyers, feeding back into inflation and strengthening the case for further rate hikes in a cycle that energy costs are driving.^3,2