Amounts so accepted shall remain available until expended for the purpose of offsetting the cost of measures undertaken by the Secretary of Defense to mitigate adverse impacts of such a project on military operations and readiness or to conduct studies of potential measures to mitigate such impacts. (g) Effect of Department of Defense hazard assessment An action taken pursuant to this section shall not be considered to be a substitute for any assessment or determination required of the Secretary of Transportation under section 44718 of title 49. (h) Savings clause Nothing in this section shall be construed to affect or limit the application of, or any obligation to comply with, any environmental law, including the National Environmental Policy Act of 1969 ( 42 U.S.C. 4321 et seq.). (i) Definitions In this section: (1) The term adverse impact on military operations and readiness means any adverse impact upon military operations and readiness, including flight operations, research, development, testing, and evaluation, and training, that is demonstrable and is likely to impair or degrade the ability of the armed forces to perform their warfighting missions. (2) The term energy project means a project that provides for the generation or transmission of electrical energy. (3) The term landowner means a person that owns a fee interest in real property on which a proposed energy project is planned to be located. (4) The term military installation has the meaning given that term in section 2801(c)(4) of this title. (5) The term military readiness includes any training or operation that could be related to combat readiness, including testing and evaluation activities. (6) The term military training route means a training route developed as part of the Military Training Route Program, carried out jointly by the Federal Aviation Administration and the Secretary of Defense, for use by the armed forces for the purpose of conducting low-altitude, high-speed military training. (7) The term unacceptable risk to the national