Mixed Arbitration

Sahib Singh is a  member of the international litigation and arbitration group at Skadden and a visiting lecturer at the University of Vienna. This note was prepared before the Enron v. Argentina annulment decision became available at the beginning of August. A note on that case is forthcoming on EJIL: Talk! On 29 June 2010, the ad hoc ICSID Annulment Committee annulled the initial award in Sempra Energy International v. Argentina, finding that the initial tribunal had exercised a manifest excess of powers. The decision is central to our understanding of necessity in international investment law, and particularly the relationship between necessity under Article XI of the Argentina-US BIT of 1991 and under customary international law. Unfortunately, the committee’s decision leaves much to be desired in terms of its interpretive methodology. The central critique of this post, is the degree of relevance the committee’s decision gives to necessity under customary international law when interpreting Article XI. It also questions the presumptive relevance of necessity under custom as an interpretive tool, when…