16 U.S. Code § 35 - Private use of electricity from lighting and power plant
Private parties or companies doing business in the Yellowstone National Park under authority from the Government may be permitted, in the discretion of the Secretary of the Army, to use electricity furnished by the electric lighting and power plant of Fort Yellowstone and Mammoth Hot Springs at actual cost to the Government for operation, maintenance, and depreciation of the plant and 10 per centum additional, under such regulations as may be prescribed by the Secretary of the Army.
Department of War designated Department of the Army and title of Secretary of War changed to Secretary of the Army by section 205(a) of act July 26, 1947, ch. 343, title II, 61 Stat. 501. Section 205(a) of act July 26, 1947, was repealed by section 53 of act Aug. 10, 1956, ch. 1041, 70A Stat. 641. Section 1 of act Aug. 10, 1956, enacted “Title 10, Armed Forces” which in sections 3010 to 3013 continued military Department of the Army under administrative supervision of Secretary of the Army.