Before the Court for its consideration are four petitions for review of orders of the Federal Power Commission which present the same rather narrow but difficult question for determination. The Petitioner United Gas Pipe Line Company is a natural gas transmission company. It is a member of an affiliated group which files consolidated Federal income tax returns, and its income is included in the consolidated returns. If United had not joined in the filing of consolidated returns, but had filed returns only reporting its income for tax computations, its net taxable income would have been fixed at a 52% rate. Because another of the affiliated companies, which is not subject to Federal Power Commission jurisdiction, sustained losses, the tax rate for the consolidated group is less than 52%.1 United claimed that in fixing its rates, the Commission should allow as a part of cost of service the amount of income tax which it would have paid if it had filed a separate income tax return. The Commission disagreed. It allocated the tax differential between the 52% rate and the rate paid on the consolidated return, and allowed what it called an effective tax rate. The reasoning and conclusions of the Commission in Re Cities Service Gas Co., 30 F.P.C. 158, 49 P.U.R.3d 229, were followed by the Commission. The Commission, with two of the Commissioners dissenting, rejected the contention of United. Re United Gas Pipe Line Company, F.P.C., 54 P.U.R.3d 285.2 United has petitioned for a review of the Commission’s order. Texas Gas Transmission Corporation and Texas Eastern Transmission Corporation, who are customers of United and intervenors in the proceeding before the Commission, have also petitioned for review, aligning themselves with United.3

The Court of Appeals for the Tenth Circuit vacated the Commission’s order in the Cities Service case. Cities Service Gas Co. v. Federal Power Commission, 10th Cir. 1964, 337 F.2d 97. United would have us follow the Tenth Circuit’s Cities Service decision. The Commission says that the Cities Service case is to be distinguished because of fact differences. It urges that the Tenth Circuit decision is wrong and should not be followed. We do not think there are any such fact differences between Cities Service and this case as call for the application of any different rule of decision. The Court in the Tenth Circuit case held that the tax allocation as made by the Commission’s order was contrary to the requirements which Congress had imposed. We think the Tenth Circuit case is correct and that the principles which are announced in its opinion are here applicable and controlling. The Commission’s order, using an incorrect income tax rate in computing cost of service for the fixing of United’s gas rates is erroneous and must be

Vacated and set aside.