16 C.F.R. § 1025.56
Within twenty (20) days after issuance of a Final Decision and Order by the Commission, any party may file a petition for reconsideration of such decision or order, setting forth the relief desired and the grounds in support of the petition. Any petition filed under this section must be confined to new questions raised by the decision or order upon which the petitioner had no previous opportunity to argue. Any party desiring to oppose such a petition shall file an opposition to the petition within ten (10) days after sevice of the petition. The filing of a petition for reconsideration shall not stay the effective date of the Final Decision and Order or toll the running of any statutory time period affecting the Decision or Order unless specifically ordered by the Commission.
16 C.F.R. § 1025.56