In any proceeding, the Commission may order, and the Staff or any party may move that parties file briefs, memoranda, or proposed orders of the parties or statements of position. Except as provided in RP 14.102 the Commission will determine in each case the time within which any briefs may be filed. Untimely submitted briefs will not be considered except for good cause shown. Requests for extensions of time for the filing of briefs shall only be granted in cases of unusual merit. Such requests shall be submitted to the Chairman of the Commission.
39 Miss. Code. R. 1-15-113