Cite as: 535 U. S. 467 (2002)
Opinion of the Court
nues were necessarily determined by the rates subject to review, with the rate of return applied to the very property subject to valuation. Duquesne Light Co. v. Barasch, 488 U. S. 299, 309, n. 5 (1989); Hope Natural Gas Co., supra, at 601.
Small wonder, then, that Justice Brandeis was able to demonstrate how basing rates on Smyth's galactic notion of fair value could produce revenues grossly excessive or insufficient when gauged against the costs of capital. He gave the example (simplified) of a $1 million plant built with promised returns on the equity of $90,000 a year. Southwestern Bell Telephone Co., supra, at 304-306. If the value were to fall to $600,000 at the time of a rate proceeding, with the rate of return on similar investments then at 6 percent, Smyth would say a rate was not confiscatory if it returned at least $36,000, a shortfall of $54,000 from the costs of capital. But if the value of the plant were to rise to $1,750,000 at the time of the rate proceeding, and the rate of return on comparable investments stood at 8 percent, then constitutionality under Smyth would require rates generating at least $140,000, $50,000 above capital costs.
The upshot of Smyth, then, was the specter of utilities forced into bankruptcy by rates inadequate to pay off the costs of capital, even when a drop in value resulted from general economic decline, not imprudent investment; while in a robust economy, an investment no more prescient could claim what seemed a rapacious return on equity invested. Justice Brandeis accordingly advocated replacing "fair value" with a calculation of rate base on the cost of capital prudently invested in assets used for the provision of the public good or service, and although he did not live to enjoy success, his campaign against Smyth came to fruition in FPC v. Hope Natural Gas Co., 320 U. S. 591 (1944).
In Hope Natural Gas, this Court disavowed the position that the Natural Gas Act and the Constitution required fair value as the sole measure of a rate base on which "just and
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