Colombia pledges to exit investment protection system after fossil fuel lawsuits

The ISDS system, a mechanism embedded in more than 2,500 international investment agreements (IIAs) and bilateral investment treaties (BITs), allows foreign investors to sue sovereign states in private tribunals for policy changes that negatively impact their expected profits. While originally designed to protect investors from arbitrary expropriation in the post-colonial era, the system has increasingly been utilized by oil, gas, and mining companies to challenge environmental regulations, carbon taxes, and phase-out mandates essential to meeting the goals of the Paris Agreement.

The Colombian Precedent and the March 2026 Report

President Gustavo Petro’s receipt of the "The Economic Model is Changing" report marks a pivotal moment in South America’s approach to international trade law. Colombia has been a frequent target of ISDS claims, particularly in the mining sector. The report, compiled by a multi-disciplinary task force of economists, environmental lawyers, and diplomats, argues that the current ISDS architecture is fundamentally incompatible with the country’s transition toward a "life-based economy" that prioritizes biodiversity and renewable energy.

According to the report, Colombia currently faces pending ISDS claims totaling several billion dollars, many of which stem from judicial or administrative decisions intended to protect the high-altitude páramo ecosystems—vital water sources for millions of citizens—from large-scale mining. The experts advising the Colombian presidency noted that while the intent to withdraw from these treaties is clear, the execution remains fraught with "legal landmines."

The report highlights that the process of "unwinding" involves more than just sending a notice of termination. Many of Colombia’s existing BITs contain "survival" or "sunset" clauses that extend the protection of existing investments for 10, 15, or even 20 years after a treaty has been officially scrapped. This means that even if Colombia exits its treaties today, a coal company with current operations could still sue the government in 2040 for a climate policy enacted in 2027.

A Chronology of the Global ISDS Backlash

The momentum to dismantle or reform the ISDS system has built steadily over the last decade, reaching a fever pitch in the mid-2020s.

• 2017–2020: Early warnings emerged as Vattenfall sued Germany over its nuclear phase-out, and Rockhopper Exploration sued Italy over a ban on offshore oil drilling. These cases demonstrated that even advanced economies were not immune to "regulatory chill"—the phenomenon where governments delay or weaken environmental laws to avoid expensive litigation.
• 2022–2023: A mass exodus from the Energy Charter Treaty (ECT) began. France, Germany, the Netherlands, Spain, and Poland announced their withdrawal, citing the treaty’s use by fossil fuel companies to obstruct the green transition.
• 2024: The United Kingdom officially joined the withdrawal from the ECT, further signaling the collapse of the world’s most litigated investment treaty.
• 2025: Several Latin American and African nations began a coordinated review of their BITs, seeking to create a unified front against the "asymmetric" nature of ISDS tribunals.
• March 2026: The Colombian report is released, providing a technical roadmap for what experts call "coordinated termination," suggesting that nations must act in blocs to neutralize sunset clauses.

The Financial Stakes: Data and Statistics

The scale of the ISDS "industry" is vast. Data from the United Nations Conference on Trade and Development (UNCTAD) and the International Centre for Settlement of Investment Disputes (ICSID) reveal a system that has grown exponentially.

As of early 2026, the total number of known ISDS cases has surpassed 1,350. Of these, approximately 20% involve the fossil fuel and mining sectors. The financial implications are staggering:

• Total Awards: Tribunals have awarded more than $100 billion in total to investors over the history of the system.
• Average Legal Costs: A single ISDS case costs a government an average of $5 million to $10 million in legal fees alone, regardless of whether they win or lose.
• The "Climate Gap": Research indicates that the potential ISDS liability for global oil and gas project cancellations could exceed $340 billion—a sum that would effectively bankrupt the climate adaptation budgets of many developing nations.

Experts point out that the lack of transparency in many of these tribunals makes it difficult to track the exact amount of taxpayer money being diverted from public services to corporate compensation. Unlike domestic courts, ISDS proceedings often take place behind closed doors, with hand-picked arbitrators who are not bound by judicial precedent.

The Necessity of International Coordination

The central warning from the experts advising the Colombian government is that "going it alone" is a high-risk strategy. When a single country terminates a treaty unilaterally, it remains vulnerable to the sunset clauses mentioned above. However, if a group of countries terminates their treaties simultaneously and signs a "neutralization agreement," they can legally override the survival clauses between themselves.

"International coordination is not just a diplomatic preference; it is a legal necessity," says Dr. Elena Rossi, a senior fellow at the Institute for International Economic Law. "If Colombia, Brazil, and Chile, for example, agree to terminate their intra-regional treaties and explicitly state that the sunset clauses are null and void, they create a new layer of international law that protects them from future claims. Without this, they are simply sitting ducks for the next two decades."

Furthermore, coordination is required to prevent "forum shopping," where a company from a country that has exited the ISDS system funnels its investment through a subsidiary in a country that still maintains an active treaty, thereby maintaining its right to sue.

Official Responses and Industry Pushback

The reaction to the Colombian report and the broader movement against ISDS has been polarized.

Government Representatives: Many officials in the Global South have praised the report as a "declaration of legal independence." A spokesperson for the African Union’s trade commission stated that the "Colombian model" of rigorous treaty review is being closely watched across the continent as nations seek to protect their sovereign right to regulate in the interest of the climate.

International Organizations: The UN has expressed cautious support for reform. The UN Commission on International Trade Law (UNCITRAL) has been working on a proposal for a "Multilateral Investment Court" to replace the ad-hoc ISDS system. However, critics argue that a new court would simply institutionalize the same problematic principles unless the underlying substantive rights of investors are fundamentally rewritten.

Investor Groups: Conversely, global chambers of commerce and business advocacy groups warn that dismantling ISDS will lead to a "capital flight" from developing nations. They argue that without the protection of international arbitration, the risk of investing in large-scale infrastructure and renewable energy projects becomes too high, potentially starving the green transition of the private capital it requires.

Broader Impact and Future Implications

The "unwinding" of the ISDS system is expected to be the defining legal battle of the late 2020s. As nations move toward the 2030 deadline for the Sustainable Development Goals (SDGs), the conflict between private investment protection and public climate action will only intensify.

The implications of this shift extend beyond the environment. The movement to reform ISDS is part of a broader trend toward "re-globalization," where trade agreements are being rewritten to include enforceable labor standards, human rights protections, and tax cooperation.

For President Petro and other leaders of the "High Ambition" coalition, the goal is to create a new generation of investment agreements that facilitate the flow of capital into renewables while ensuring that governments retain the "policy space" to protect their citizens from the ravages of climate change.

However, the path forward is narrow. The legal complexity of dismantling thousands of overlapping treaties requires a level of diplomatic synchronization rarely seen in international affairs. As the March 2026 report concludes, the transition away from the old economic model is inevitable, but without a coordinated legal strategy, the cost of that transition may be higher than many nations can afford to pay. The world is watching to see if the Colombian initiative will spark a global "treaty bonfire" or if the "sunset clauses" of the past will continue to cast a long, expensive shadow over the planet’s future.