Potomac Electric Power Co. No. 8967, United States Court of Appeals, District of Columbia, Potomac Electric Power Company v. Public Utilities Commission of District of Columbia, and James H. Flanagan, James F. Reilly and Charles W. Kutz, constituting Public Utilities Commission of District of Columbia, United States, peoples counsel, intervenors; no. 8995, United States v. [same], Potomac Electric Power Company, peoples counsel, intervenors; brief on behalf of United States.