US oil giant ExxonMobil is taking the European Commission to international arbitration over EU rules that oblige fossil fuel producers to help build carbon storage capacity. The move, confirmed in a Commission document seen by Euronews, marks a direct legal assault on a central pillar of Brussels' climate strategy.
Three ExxonMobil subsidiaries — incorporated in Belgium, Luxembourg, and the Netherlands — have filed a notice of arbitration under the Energy Charter Treaty (ECT), using the procedural rules of the United Nations Commission on International Trade Law. The ECT, a post-Cold War agreement originally designed to protect investments in former communist states, has become a flashpoint because it allows energy companies to sue governments over policies that could dent expected profits.
The dispute centres on the Net-Zero Industry Act (NZIA), which sets a Union-wide target of 50 million tonnes of annual CO₂ injection capacity by 2030. Under the law, authorised oil and gas producers must contribute to that goal, reflecting the principle that those who extract fossil fuels should also help manage the resulting emissions.
ExxonMobil argues that the obligations are unworkable, citing lengthy permitting procedures and prohibitive costs. The company also alleges breaches of the ECT's provisions on fair and equitable treatment, non-discrimination, and protection against expropriation. It has indicated it will seek provisional measures to suspend the injection requirements for its affected subsidiaries.
A test for the polluter-pays principle
The legal challenge arrives at a delicate moment for the Commission, which is already delaying a proposal on CO₂ transport infrastructure and markets that was expected in the third quarter of the year. If ExxonMobil succeeds, it could embolden other energy majors to contest similar obligations, potentially weakening the EU's ability to shift the financial burden of decarbonisation onto the industry.
The NZIA rules apply to producers extracting more than 610,000 tonnes of oil equivalent per year or accounting for more than 5% of total EU production. That threshold captures 44 major oil and gas companies, but ExxonMobil's case could test the legal basis of the entire contribution mechanism.
Brussels is still analysing the notice and preparing its response, according to the document. The Commission declined to comment on ongoing litigation. Details of the compensation sought by ExxonMobil or the financial exposure facing the EU have not been disclosed.
The case also highlights a broader tension: while carbon capture and storage (CCS) is increasingly seen as essential for hard-to-abate sectors like steel, cement, and aluminium, critics — including the Institute for Energy Economics and Financial Analysis — dismiss it as expensive and unproven. The EU's approach, however, is to make producers directly responsible rather than relying on public funding or voluntary investment.
Commissioner for Climate Action Wopke Hoekstra has defended CCS as a practical tool, even as he acknowledges it is not a silver bullet. In September, he hailed the launch of Europe's largest carbon capture facility in Sluiskil, the Netherlands, operated by Yara. The plant will capture 800,000 tonnes of CO₂ annually, cutting its emissions by a quarter. The carbon will be liquefied, shipped, and buried under the North Sea via the Northern Lights project in Norway.
Speaking from Sluiskil, Norwegian Prime Minister Jonas Gahr Støre noted that storing carbon underground was once dismissed as impossible. "Now it's a reality," he said, pointing to the cross-border nature of the project. "Norwegian expertise and infrastructure are being used to reduce greenhouse gas emissions far beyond Norway's own borders."
Hoekstra echoed that sentiment, arguing that Europe cannot afford to leave any part of the solution space untapped. "This is a practical climate solution that cuts emissions while keeping our industrial base strong," he said.
Yet ExxonMobil's arbitration threat underscores the resistance from established fossil fuel producers. The outcome could shape not only the future of CCS in Europe but also the credibility of the EU's broader climate policy. As the bloc pushes ahead with its Green Deal, the question of who pays for the transition remains as contentious as ever.
