For the purpose of improving navigation on the Missouri River, and for other purposes incidental thereto, the dam and appurtenant works now under construction at Fort Peck, Montana, and a suitable power plant for the production of hydroelectric power (which dam, power plant, and appurtenant works are hereinafter called Fort Peck project), shall be completed, maintained, and operated under the direction of the Secretary of the Army and the supervision of the Chief of Engineers, subject to the provisions of this chapter relating to the powers and duties of the Bureau of Reclamation (hereinafter called the Bureau), as provided for in section 833a(a) of this title, respecting the transmission and sale of electric energy generated at said project. The Secretary of the Army shall provide, construct, operate, maintain, and improve at Fort Peck project such machinery, equipment, and facilities for the generation of electric energy as the Bureau may deem necessary to develop such electric energy as rapidly as markets may be found therefor. The electric energy thus generated and not required for the operation of the dam at such project and the navigation facilities employed in connection therewith shall be delivered to the Bureau for disposition as provided in this chapter.