Summary

Utah Power Light Company v. United States…

Not only does the Constitution (art. 4, § 3, cl. 2) commit to Congress the power 'to dispose of and make all needful rules and regulations respecting' the lands of the United States, but the settled course of legislation, congressional and state, and repeated decisions of this court, have gone upon the theory that the power of Congress is exclusive, and that only through its exercise in some form can rights in lands belonging to the United States be acquired.
Source: Wikisource

Utah Power Light Company v. United States…

In the aggregate these are used in collecting water from mountain streams, in conducting it for considerable distances to power house where the force arising from its descent through the pipe lines is transmuted into electric energy, and in transmitting that energy to places beyond the reservations, where it is sold to whoever has occasion to use it for power, lighting, or heating. In each case some part of the works is on private lands, but much the greater part is on lands of the United States.
Source: Wikisource

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