AES Corporation v. Argentine Republic
ICSID · Investment (ICSID and treaty) · Argentina · 30 May 2025
Why it matters
This award is a landmark in investment treaty arbitration for its detailed analysis of Argentina's electricity sector reforms following its economic crisis. It clarifies the scope of fair and equitable treatment in the context of regulatory changes affecting long-term investments, and rejects Argentina's necessity defense under both the BIT and customary international law. The award also addresses complex issues of causation and quantum, including the treatment of windfall profits and the valuation of damages as of the date of the award.
Summary
The case concerns AES Corporation, a US energy company, which invested in several electricity generation plants in Argentina following the 1990s privatization and deregulation of the electricity sector. After Argentina's severe economic crisis in 2001-2002, the government enacted emergency measures that fundamentally altered the regulatory framework for electricity generation, including price caps on spot electricity, changes to capacity payments, withholding of receivables, and mandatory investment programs (FONINVEMEM). AES claimed these measures violated the US-Argentina Bilateral Investment Treaty (BIT), specifically the provisions on fair and equitable treatment (FET), full protection and security (FPS), and non-impairment of investment. Argentina raised several defenses: that AES had waived its rights by agreeing to the new regulatory schemes, that the measures were justified under Article XI of the BIT (non-precluded measures for essential security interests), and that a state of necessity existed under customary international law. The Tribunal, after a lengthy proceeding including a suspension period, dismissed all of Argentina's preliminary objections and defenses. On the merits, the Tribunal found that Argentina breached the FET standard through measures affecting spot price formation and dispatch, capacity payments, withholding of receivables, and the cost-plus system and prohibition of PPAs. It also found breaches of the non-impairment obligation under Article II.2(b) of the BIT. However, the Tribunal dismissed the FPS claim and exercised judicial economy on the minimum standard of treatment claim. On quantum, the Tribunal awarded AES US$715.9 million in damages as of December 31, 2020, plus simple interest at the 1-year US Treasury Bill rate from that date until payment. The Tribunal also ordered Argentina to bear all arbitration costs and pay 80% of AES's legal fees (excluding those during the suspension period), totaling US$15.8 million. The award is notable for its rejection of Argentina's necessity defense and its detailed analysis of the regulatory measures' impact on the investment.
The detail
Parties: AES Corporation v. Argentine Republic
Case number: ICSID Case No. ARB/02/17
Outcome: Argentina breached fair and equitable treatment and non-impairment obligations under the US-Argentina BIT; ordered to pay US$715.9 million in damages plus 80% of Claimant's legal costs.
Quantum: US$715.9 million
Applicable law: Treaty Between the United States of America and the Argentine Republic Concerning the Reciprocal Encouragement and Protection of Investment (US-Argentina BIT); ICSID Convention; Argentine law (Electricity Law No. 24.065, Emergency Law No. 25.561, and various Secretariat of Energy Resolutions).
Issues in play: The dispute involved the collision between Argentina's sovereign right to adopt emergency measures during its 2001-2002 economic crisis and its treaty obligations to protect foreign investments. Key principles included fair and equitable treatment, full protection and security, non-arbitrary and non-discriminatory treatment, and the state of necessity defense under Article 25 of the ILC Articles on State Responsibility.
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