; and (2) places into service one or more qualified zero-emission electricity generating units that replace the generation capacity of the carbon-emitting generating units described in paragraph (1) in sufficient amounts to satisfy the condition specified in subsection (c). (b) Grant amount (1) In general The amount of the grant under subsection (a) with respect to any qualified zero-emission electricity generating unit shall be the applicable percentage of the cost of such qualified zero-emission electricity generating unit. (2) Applicable percentage For purposes of paragraph (1), the term applicable percentage means— (A) 50 percent in the case of a qualified zero-emission electricity generating unit that begins to generate electricity before December 31, 2025; (B) 40 percent in the case of a qualified zero-emission electricity generating unit that begins to generate electricity before December 31, 2030; and (C) 30 percent in the case of a qualified zero-emission electricity generating unit that begins to generate electricity before December 31, 2037. (c) Conditions for the grant No grant shall be made under this section unless the Secretary of Energy determines that the eligible electricity provider, as of the date that the applicable percentage for the grant begins to apply under subsection (b)(2), owns generating units that have an aggregate generation capacity that is not less than the annualized amount of generation capacity that is owned by such eligible electricity provider during the 5-year period ending on the date of the enactment of this section. (d) Time for payment of grant The Secretary of Energy shall make payment of any grant under subsection (a) during the 60-day period beginning on the later of— (1) the date of the application for such grant