MR. JUSTICE DOUGLAS delivered the opinion of the Court.
We granted certiorari in these cases to determine whether § 441 of the Tax Reform Act of 1969, 26 U. S. C. § 167 (l), circumscribes the authority of the Federal Power Commission under the Natural Gas Act, 52 Stat. 821, as amended, 15 U. S. C. § 717 et seq., to permit a regulated utility to change its method of computing depreciation for ratemaking purposes from "flow-through" to ...
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