Md. Code, Pub. Util. § 3-114

(a) On rehearing, the Commission may: (1) consider facts not presented in the original hearing, including facts arising after the date of the original hearing; and (2) abrogate, change, or modify the original order by new order. (b) Except as otherwise ordered by the Commission, the rehearing or application for the rehearing does not: (1) stay the enforcement of an order of the Commission; or (2) excuse a person affected by the order from complying with the terms of the order. (c) (1) A party in interest may apply to the Commission for rehearing within 30 days after service of a final order on the party. (2) The Commission may: (i) act on the application; and (ii) rehear a final order or conduct further proceedings on its own motion after the filing of a proposed order, as the Commission considers necessary. (3) If a rehearing is granted on an application under this subsection, the Commission shall decide the case within 30 days after the case is finally submitted on rehearing.