16 C.F.R. § 1025.19
Two or more matters which have been scheduled for adjudicative proceedings and which involve similar issues may be consolidated for the purpose of hearing or Commission review. A motion for consolidation may be filed by any party to such proceedings not later than thirty (30) days prior to the hearing and served upon all parties to all proceedings in which joinder is contemplated. The motion may include a request that the consolidated proceedings be maintained as a class action in accordance with § 1025.18 of these rules. The proceedings may be consolidated to such extent and upon such terms as may be proper. Such consolidation may also be ordered upon the initiative of the Presiding Officer or the Commission. Single representatives may be designated by represented parties, intervenors, and participants with an identity of interests.
16 C.F.R. §1025.19