; or (B) clean energy improvements, including— (i) electricity generated from solar, wind, geothermal, small-scale hydropower, and hydrokinetic energy sources; (ii) fuel cells using non-fossil fuel sources; (iii) advanced storage technologies; and (iv) electric vehicle infrastructure. (2) Secretary The term Secretary means the Secretary of the Treasury or the Secretary’s delegate. 4. Clean Energy Victory Bonds (a) In general Not later than 6 months after the date of the enactment of this Act, the Secretary, in consultation with the Secretary of Energy and the Secretary of Defense, shall issue bonds to be known as Clean Energy Victory Bonds , the proceeds from which shall be used to carry out the purposes described in section 9512(c) of the Internal Revenue Code of 1986 (as added by section 5). (b) Savings bond Any Clean Energy Victory Bond issued under this section shall be issued by the Secretary— (1) as a savings bond of series EE, or as administered by the Bureau of the Fiscal Service of the Department of the Treasury, in a manner consistent with the provisions of section 3105 of title 31, United States Code; and (2) in denominations of $25 and such other amounts as are determined appropriate by the Secretary, and shall mature within such periods as determined by the Secretary. (c) Amount of Clean Energy Victory Bonds The aggregate face amount of the Clean Energy Victory Bonds issued annually under this section shall be not greater than $50,000,000,000. (d) Interest Clean Energy Victory Bonds shall bear interest at the rate the Secretary sets for Savings Bonds of Series EE and Series I, plus a rate of return determined by the Secretary which is based on the valuation of— (1) savings achieved through reduced energy spending by the Federal Government resulting from clean energy projects funded from the proceeds of such bonds