Energy Charter Treaty

The Energy Charter Treaty (ECT) is a plurilateral investment agreement between 53 European and Central Asian countries. It was signed in 1994 and entered into force in April 1998.

About 30 countries around the world are at different stages of joining the ECT. Burundi, Eswatini (formerly Swaziland) and Mauritania are first in line, followed by Pakistan and Uganda.

The original objective of the ECT was to overcome the political and economic divisions between Eastern and Western Europe after the demise of the Soviet Union, as well as to strengthen Europe’s energy security. European countries wanted to secure the access to fossil fuel resources of the former Soviet countries by protecting foreign energy investments in these countries.

The ECT provides for an Investor State Dispute Settlement (ISDS) mechanism to resolve disputes between an investor and a member state. To this day, it is the world’s most widely used legal instrument for initiating ISDS arbitrations. It has been invoked by investors in 124 cases.

Critics argue that as with most other investment agreements, it places investors’ economic rights and interests over the social, ecological and economic interests of host states and their societies. The ECT imposes obligations on the host state but not on foreign investors. The ECT has also been condemned by environmental activists for protecting the fossil fuel industry and undermining serious climate action.

Spain has been subject to 45 arbitration disputes under the ECT after it implemented a series of energy reforms affecting the renewables sector, including a reduction in subsidies for producers. While some cases are still pending, Spain has already been ordered to pay over €800 million.

You can find out more about the Energy Charter Treaty on the ECT’s dirty secrets website.

Key cases include:

Vattenfall (Sweden) vs. Germany: In 2007 the Swedish energy corporation was granted a provisional permit to build a coal-fired power plant near the city of Hamburg. In an effort to protect the Elbe river from the waste waters dumped from the plant, environmental restrictions were added before the final approval of its construction. The investor initiated a dispute, arguing it would make the project unviable. The case was ultimately settled in 2011, with the city of Hamburg agreeing to the lowering of environmental standards.

Yukos (Isle of Man) vs. Russia: Yukos was a Russian oil and gas company. It was acquired from the Russian government during the controversial “loans for shares” auctions of the mid 1990s, whereby some of the largest state industrial assets were leased (in effect privatized) through auctions for money lent by commercial banks to the government. The auctions were rigged and lacked competition, and effectively became a form of selling for a very low price. In 2003, the Yukos CEO was arrested on charges of fraud and tax evasion and the following year Yukos’ assets were frozen or confiscated. In 2007 Yukos’ former shareholders filed a claim for over US$100 billion, seeking compensation for their expropriation. The dispute resulted in 2014 in the arbitrators awarding the majority shareholders over US$50 billion in damages. The investors have been trying to enforce the award in several countries since then.

NextEra (Netherland) vs. Spain: The Dutch investor filed for arbitration in May 2014, after Spain changed the regulatory framework applicable to its investment, namely the construction of two solar power plants. NextEra claimed that Spain abolished the long-term premium and tariff system, negatively affecting the profitability of the project. However, Spain alleged that NextEra should have been aware that changes could be made to the regulatory regime. In May 2019, the investor was awarded around €290 million. Spain filed for annulment in October 2019.

Photo: Marc Maes / Twitter

Last update: April 2020

Reuters | 6-Feb-2026
In this investment dispute, Berkeley claims that Spain’s actions against its Spanish subsidiary, Berkeley Minera España, and the SalamancAustralia’s Berkeley Energia filed a memorial of claim for about $1.25 billion against Spain at the World Bank’s arbitration tribunal, up from a previous request, over the blocked Salamanca uranium project.
The Brussels Times | 4-Feb-2026
The European Commission has launched new legal steps against several EU countries over energy-related obligations, including continued participation in the Energy Charter Treaty.
European Commission | 23-Jan-2026
The European Commission has opened an in-depth investigation to assess whether an arbitration award, in which Bulgaria is ordered to pay compensation to ACF for changes to a renewable electricity support measure, is in line with EU State aid rules.
UNN | 23-Jan-2026
The Arbitration Tribunal in Stockholm rejected the claim of the foreign investor Modus Energy International B.V. regarding changes to the "green tariff".
Investing.com | 15-Jan-2026
La Cour commerciale internationale de Singapour a rejeté la demande de la République de Pologne visant à annuler une sentence arbitrale accordée à GreenX Metals Limited en vertu du Traité sur la Charte de l’énergie.
Market Screener | 15-Jan-2026
The mining company said the Singapore International Commercial Court of the Republic of Singapore rejected in its entirety, the Republic of Poland’s application to set aside the Energy Charter Treaty award.
Euractiv | 12-Dec-2025
La Commission européenne menace Budapest de nouvelles poursuites judiciaires pour avoir autorisé la compagnie pétrolière nationale MOL à utiliser le controversé Traité sur la charte de l’énergie afin de poursuivre un autre État membre, en violation flagrante d’une décision de la justice européenne.
Leah Sullivan | 21-Nov-2025
Civil society groups are calling on the Government to leave the Energy Charter Treaty (ECT) and reject ISDS, as a new threat emerges over the government’s refusal to grant an exploration licence to an oil and gas company.
Luxembourg Times | 21-Nov-2025
Funds used fossil-fuel friendly tool to fight back when countries pulled renewable energy incentives, hurting their green investments.
AP | 5-Nov-2025
The Dutch Supreme Court on Friday rejected a final appeal by Russia against a $50 billion arbitration award to former shareholders of Russian oil giant Yukos, who claimed Moscow deliberately bankrupted the company more than 20 years ago.