The administration, protection, and development of the Big Bend National Park shall be exercised under the direction of the Secretary of the Interior by the National Park Service, subject to the provisions of the Act of August 25, 1916 (39 Stat. 535), entitled “An Act to establish a National Park Service, and for other purposes”,¹ as amended: Provided, That the provisions of the Federal Power Act [16 U.S.C. 791a et seq.] shall not apply to this park.