Guide for Potential Amici in International Investment Arbitration

The document explains the role of amicus curiae in ICSID proceedings, detailing the legal requirements under Rule 37(2) for non-disputing parties to file written submissions. It highlights the tension between investment protection and human rights, arguing that amicus interventions are critical for introducing public interest perspectives into a system that often prioritizes investor rights. The guide provides best practices for drafting petitions and submissions, emphasizing the need for legal grounding and the demonstration of the petitioner's independence and expertise.

• International investment arbitration, primarily governed by bilateral investment treaties (BITs), often lacks explicit references to human rights, making the role of the amicus curiae essential for introducing these perspectives into the proceedings.
• Under ICSID Rule 37(2), a non-disputing party seeking to file a written submission must persuade the tribunal that the intervention will assist in determining a factual or legal issue, address a matter within the scope of the dispute, and demonstrate a significant interest in the proceeding.
• While ICSID tribunals have the discretion to allow written amicus submissions even over the objections of the disputing parties, they cannot allow an amicus to attend oral hearings without the consent of both parties, who effectively hold a veto power.
• Human rights norms can enter investment arbitration through treaty interpretation, the principle of systemic integration, or by being identified as part of 'transnational public policy' involving principles commonly recognized by global legal systems.
• To be successful, an amicus petition should demonstrate the petitioner's suitability by proving recognized expertise, an established interest, and independence; a lack of perceived neutrality can lead to the rejection of the application.
• Effective amicus submissions should avoid purely moral or ethical claims and instead use specific legal arguments, tying human rights obligations to the applicable international investment law governing the dispute.
• The case of Pac Rim Cayman LLC v Republic of El Salvador is noted as an exceptional instance of transparency where proceedings were webcast, though this was driven by specific requirements in the CAFTA-DR treaty rather than general ICSID practice.
• ICSID tribunals are not bound by a strict system of precedent and may disregard previous awards or the examples of other tribunals when deciding whether to grant amicus status or interpreting treaties.

APA

Miller, B., Liu, J., Wright, R., & Yoo, J. (2014). Guide for Potential Amici in International Investment Arbitration. Center for International Environmental Law. https://ciel.org/Publications/Guide_PotentialAmici_Jan2014.pdf

Chicago

Miller, Benjamin, Jennifer Liu, Ramin Wright, and Jenny Yoo. Guide for Potential Amici in International Investment Arbitration. Center for International Environmental Law, 2014. https://ciel.org/Publications/Guide_PotentialAmici_Jan2014.pdf.

Wikipedia

{{cite report |last1=Miller |first1=Benjamin |last2=Liu |first2=Jennifer |last3=Wright |first3=Ramin |last4=Yoo |first4=Jenny |title=Guide for Potential Amici in International Investment Arbitration |publisher=Center for International Environmental Law |date=January 2014 |url=https://ciel.org/Publications/Guide_PotentialAmici_Jan2014.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{miller2014guide, author = {Miller, Benjamin and Liu, Jennifer and Wright, Ramin and Yoo, Jenny}, title = {{Guide for Potential Amici in International Investment Arbitration}}, institution = {Center for International Environmental Law}, year = {2014}, month = jan, url = {https://ciel.org/Publications/Guide_PotentialAmici_Jan2014.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }