Summary

Portrait of William O. Douglas William O. Douglas Federal Power Commission v. Interstate Natural Gas Company Public Service Commission of Missouri…

Granting that a federal court does not have the power to regulate rates, it does not follow that in discharging the duty to distribute a fund of its own creation it is barred from an inquiry which has some aspects though I believe very minor ones-that would also appear in a rate proceeding. In short, issues that may be pertinent to a rate investigation before a regulatory commission are not therefore beyond the power of judicial inquiry when they arise in a totally different relation.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas Federal Power Commission v. Interstate Natural Gas Company Public Service Commission of Missouri…

But a court of equity has inherent powers to invite such help from a great agency of the Government. While the Federal Power Commission could, if it chose, decline to render that help, it is inconceivable that it would do so. As to the intermediate purchasers, subject not to the Power Commission but to State or city regulation, the local agencies could be similarly resorted to for aid in the ultimate problem before the lower court of distributing a commingled fund as to which none of the interested parties can fairly be said, as a matter of law, to have an obvious, demonstrated claim.
Source: Wikisource

Portrait of William O. Douglas William O. Douglas Federal Power Commission v. Interstate Natural Gas Company Public Service Commission of Missouri…

The governing principle is that of unjust enrichment. Since the task of the court is to place the parties in the position in which they would have been had there not been a postponement of the effective date of the rate-reduction, it is now the duty of the court to make that retrospective determination not by unfounded assumptions erected into rigid legal rules, but by an ascertainment of what actually would have happened contemporaneously had purchasers from Interstate obtained their gas at the lower rate.
Source: Wikisource

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