Federal Power Commission v. Tennessee Gas Transmission Co.

Background

Tennessee Gas Transmission Company, a natural gas company, filed increased rates that included a 7% return on investment. The Federal Power Commission suspended the new rates for five months, held hearings, and then found a 6% return, not 7%, to be just and reasonable. The Commission ordered Tennessee Gas to file lower rates retroactive to the end of the suspension and to refund amounts collected in excess. A Court of Appeals set aside that interim reduction and refund, and the Supreme Court granted review.

Reasoning

The main question was whether the Commission may order an immediate rate cut and refunds when one issue (the rate of return) is decided but other issues (cost allocation among six zones) remain undecided. The Court held the Commission has that authority under the Natural Gas Act and prior practice. The Court emphasized that a company that asks for higher rates assumes the risk of proving them, and that early refunds protect consumers from prolonged overcharges. The Court therefore upheld the Commission’s interim order finding the 7% return unlawful and directing refunds based on 6%.

Real world impact

The decision means regulators can require prompt retroactive rate reductions and refunds when part of a filed increase is found unlawful, even while other technical questions are decided later. Gas companies face the risk of retroactive losses when they seek higher rates. Consumers are protected from extended collection of excessive charges, though final allocation and other issues may still be decided afterward.