Annulment under the ICSID Convention offers a limited remedy on the basis of a few carefully circumscribed grounds. Recently, losing parties have attacked awards for a wide array of reasons. Some ad hoc committees deciding these requests for annulment have taken a broad view of their powers. They have given some grounds for annulment an extremely wide interpretation thereby blurring the line between annulment and appeal. For instance, a perceived mistake in the interpretation of a rule of law has been regarded as an excess of powers for failure to apply the proper law. One ad hoc committee went beyond the reasons for annulment put forward by the applicant. It actively searched for additional grounds and eventually annulled the award for a reason not relied upon by the applicant. Some ad hoc committees have gone beyond the task given to them by the ICSID Convention, offering general criticism and advice to tribunals. The risk that an ICSID award will be annulled is now higher than that a non-ICSID award will be set aside by a competent domestic court.