The ILC Articles on State Responsibility in Investment Treaty Arbitration

The International Law Commission adopted the Articles on the Responsibility of States for Internationally Wrongful Acts in 2001, when there had been fewer than 100 recorded investment claims. Since then, there has been a significant rise in the number of investment treaty arbitration cases. This article considers how the ILC Articles have been used by investment treaty tribunals to analyse issues of State responsibility in investment treaty claims. The article summarises key trends concerning the use of the ILC Articles in investment treaty arbitration. It addresses the application of the ILC Articles in investment disputes, the role given to the ILC Articles in determining questions of attribution, the influence of the ILC Articles for the analysis of temporal issues, and the role of the ILC Articles in determining matters of reparation and contributory fault. The article is accompanied by a lengthy case appendix which summarises references by investment treaty tribunals to the ILC Articles from 2010-2020.