What Is the Future of Energy Charter Treaty (ECT)?

The Energy Charter Treaty (ECT) is a multi-nation investment treaty which protects investors from the nationalization of assets and other arbitrary and discriminatory state conduct made at the expense of investments in the energy sector. Most importantly, it provides a means for investors to make claims against member states for breaches of their obligations through international arbitration. Until recent withdrawals, members included Japan, the EU and the European states, the UK, and the former Soviet states.

The ECT is perhaps best known in the context of the many (50+) arbitration claims made against Spain in recent years, including by Japanese investors. These claims came about due to Spanish legislation that was detrimental to renewable infrastructure investments. Essentially, the Spanish government reduced the tariffs paid to renewable projects for the electricity they produced, rendering many projects untenable. This example suggests that the ECT could be an important protection for investors in the coming years as huge investment is made into the energy and renewables sectors. With the ECT in place, investors will take comfort in knowing that governments cannot arbitrarily change the playing field.

However, despite the obvious benefits in supporting and therefore encouraging investment, many commentators see the treaty as having a chilling effect on regulation and as an obstacle to climate-friendly policymaking. They argue that the ECT restricts legislators tackling climate change. As a result, many European countries, frustrated at efforts to negotiate and update the treaty, have recently withdrawn, or indicated they intend to withdraw. This includes, most recently, the UK. 

Sunset provisions in the treaty mean these withdrawals will not be effective for another 20 years. But the future of the treaty remains troubled and its relevance is diminishing. There is every chance the ECT will not exist in 20 years.  

This article is available in the Jenner & Block Japan Newsletter. / この記事はJenner & Blockニュースレターに掲載されています。

© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

What Is the Future of Energy Charter Treaty (ECT)?

The Energy Charter Treaty (ECT) is a multi-nation investment treaty which protects investors from the nationalization of assets and other arbitrary and discriminatory state conduct made at the expense of investments in the energy sector. Most importantly, it provides a means for investors to make claims against member states for breaches of their obligations through international arbitration. Until recent withdrawals, members included Japan, the EU and the European states, the UK, and the former Soviet states.

The ECT is perhaps best known in the context of the many (50+) arbitration claims made against Spain in recent years, including by Japanese investors. These claims came about due to Spanish legislation that was detrimental to renewable infrastructure investments. Essentially, the Spanish government reduced the tariffs paid to renewable projects for the electricity they produced, rendering many projects untenable. This example suggests that the ECT could be an important protection for investors in the coming years as huge investment is made into the energy and renewables sectors. With the ECT in place, investors will take comfort in knowing that governments cannot arbitrarily change the playing field.

However, despite the obvious benefits in supporting and therefore encouraging investment, many commentators see the treaty as having a chilling effect on regulation and as an obstacle to climate-friendly policymaking. They argue that the ECT restricts legislators tackling climate change. As a result, many European countries, frustrated at efforts to negotiate and update the treaty, have recently withdrawn, or indicated they intend to withdraw. This includes, most recently, the UK. 

Sunset provisions in the treaty mean these withdrawals will not be effective for another 20 years. But the future of the treaty remains troubled and its relevance is diminishing. There is every chance the ECT will not exist in 20 years.  

This article is available in the Jenner & Block Japan Newsletter. / この記事はJenner & Blockニュースレターに掲載されています。

© 2026 Jenner & Block LLP. Attorney Advertising. Jenner & Block LLP is an Illinois Limited Liability Partnership including professional corporations. This publication, presentation, or event is not intended to provide legal advice but to provide information on legal matters and/or firm news of interest to our clients and colleagues. Readers or attendees should seek specific legal advice before taking any action with respect to matters mentioned in this publication or at this event. The attorney responsible for this communication is Brent E. Kidwell, Jenner & Block LLP, 353 N. Clark Street, Chicago, IL 60654-3456. Prior results do not guarantee a similar outcome. Jenner & Block London LLP, an affiliate of Jenner & Block LLP, is a limited liability partnership established under the laws of the State of Delaware, USA and is authorised and regulated by the Solicitors Regulation Authority with SRA number 615729. Information regarding the data we collect and the rights you have over your data can be found in our Privacy Notice. For further inquiries, please contact dataprotection@jenner.com.

News and Insights

Event

Associate Steven Arango to Speak at the Veterans' Legal Career Fair

On September 18, Associate Steven Arango will speak on a panel at the Veterans' Legal Career Fair (VLCF), the only legal career fair in the United States dedicated to veterans, active-duty service members, and military spouses.

September 18, 2026

Publications

In American Banker, Partner Laurel Loomis Rimon Weighs in on OCC's Handling of Fintech Bank Charter Applications

Partner Laurel Loomis Rimon spoke with American Banker about how the Office of the Comptroller of the Currency is approaching bank charter applications from fintechs, amid a growing wave of companies seeking charters from federal regulators.

August 18, 2026

Event

Partner David Greenwald to Speak at PLI Program on Privilege and AI

On August 17, David Greenwald will speak at "Fitting New “Tech” Into the Attorney-Client Privilege and Work Product Protection," a virtual program hosted by the Practising Law Institute (PLI).

August 17, 2026