When an appeal is taken from an order of the Commission to the Commonwealth Court, the appellant shall immediately give notice of the appeal to all parties to the Commission proceeding as provided by § 1.54 (relating to service by a party).
52 Pa. Code § 5.631
The provisions of this §5.631 amended under the Public Utility Code, 66 Pa.C.S. § § 501, 504-506, 1301 and 1501.