The Future of Arbitration under the Energy Charter Treaty

This legal briefing examines the impact of the Court of Justice of the European Union (CJEU) Komstroy decision on intra-EU investment disputes under the Energy Charter Treaty (ECT). It argues that the ruling, alongside the Achmea and PL Holdings decisions, effectively bars investor-State dispute settlement (ISDS) between EU investors and Member States, creating significant legal and financial obstacles to the enforcement of arbitration awards. The document specifically analyzes how these rulings and EU State aid laws could impede claims by energy companies RWE and Uniper against the Netherlands regarding its coal phase-out policy.

• The CJEU's Komstroy decision establishes that the ISDS provisions of the Energy Charter Treaty (ECT) are not applicable to disputes between an EU Member State and an investor from another Member State. This ruling extends the reasoning of the earlier Achmea decision—which targeted bilateral investment treaties—to the multilateral ECT, asserting that ISDS mechanisms involving private arbitrators cannot ensure the consistent interpretation of EU law.
• Intra-EU investment arbitration awards now face systematic challenges to their validity and enforcement. Under the PL Holdings judgment, EU Member States are not only permitted but are legally obliged to challenge the validity of arbitration agreements, the jurisdiction of tribunals, and the enforcement of any resulting awards in intra-EU disputes.
• The enforcement of intra-EU awards is severely restricted within the EU, though investors may attempt to pursue them in non-EU jurisdictions. While ICSID awards are generally automatically enforceable under the ICSID Convention, EU courts are bound by CJEU case law to refuse enforcement. In non-EU courts, enforcement has become a political issue, with the European Commission acting as amicus curiae to oppose such efforts.
• EU State aid rules provide an additional mechanism to block the payment of arbitration awards. The European Commission considers that investment arbitration awards may constitute State aid if they grant an economic advantage to selected enterprises. Following Komstroy, the Commission is unlikely to find such awards compatible with the internal market because they rely on arbitration clauses that breach EU law.
• The briefing identifies specific obstacles for RWE and Uniper in their arbitration cases against the Netherlands regarding the 2019 phased ban on coal. These include the likelihood that German courts (such as the Higher Regional Court of Cologne) will find the claims inadmissible due to lack of jurisdiction, and the potential for the European Commission to classify any awarded damages as incompatible State aid.
• The document concludes that while Komstroy and related rulings blunt the impact of ECT arbitration on climate action, they may not entirely stop tribunals from proceeding, as some arbitrators ignore CJEU rulings. The authors suggest that the only definitive way for the EU to prevent investors from using the ECT to circumvent EU law and jeopardize climate policies is to withdraw from or terminate the treaty.

APA

Center for International Environmental Law (2021). The Future of Arbitration under the Energy Charter Treaty. https://www.ciel.org/wp-content/uploads/2021/12/ciel-ce-legal-briefing-future-of-intra-eu-ect-arbitration-131221.pdf

Chicago

Center for International Environmental Law. The Future of Arbitration under the Energy Charter Treaty. 2021. https://www.ciel.org/wp-content/uploads/2021/12/ciel-ce-legal-briefing-future-of-intra-eu-ect-arbitration-131221.pdf.

Wikipedia

{{cite report |author=Center for International Environmental Law |title=The Future of Arbitration under the Energy Charter Treaty |date=December 2021 |url=https://www.ciel.org/wp-content/uploads/2021/12/ciel-ce-legal-briefing-future-of-intra-eu-ect-arbitration-131221.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{centerforinternationalenvironmentallaw2021future, author = {{Center for International Environmental Law}}, title = {{The Future of Arbitration under the Energy Charter Treaty}}, institution = {Center for International Environmental Law}, year = {2021}, month = dec, url = {https://www.ciel.org/wp-content/uploads/2021/12/ciel-ce-legal-briefing-future-of-intra-eu-ect-arbitration-131221.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }