Annulment of ICSID Arbitral Award for the ‎manifest excess of powers

It is not possible to stop the implementation of the arbitration award in the International Center for the Settlement of Investment Disputes (ICSID) except by resorting to the annulment procedure. In other words, the possibility of appeal and declaration of invalidity of the arbitration decision is not foreseen in ICSID as in other arbitration institutions. Article 52 of the Washington Convention contains five ways of revoking the arbitration award, which is analyzed in this research, paragraph 1 (b), which deals with revoking due to clear violation of powers.. The plan considered for the research is divided into two parts: the first, the history of drafting paragraph b of Article 52, the basis of the authority of the arbitration board, annulment limitations, prohibition of the right of average appeal of the annulment hearing board and interpretation of the annulment have been discussed, and in the second part, by focusing the research on the excess of powers and topics such as the necessity of complying with the provisions of the investment treaty, the cases that have been considered in  ICSID award were counted.It is necessary to mention that the studied treaties here are considered to be investment ones and commercial treaties are out of the scope of the discussion.