; or (2) the date the qualified zero-emission electricity generating units described in subsection (a)(2) for which the grant is being made are placed into service. (e) Application of certain rules In making grants under this section, the Secretary of Energy shall apply rules similar to the rules of section 50 of the Internal Revenue Code of 1986 with the exception of section 50(b)(3) and section 50(b)(4) for an entity described in section 50(b)(4)(A)(i). In applying such rules, if an eligible electricity provider acquires a carbon-emitting generating unit after a grant is made to the eligible electricity provider, the Secretary shall provide for the recapture of the appropriate percentage of the grant amount in such manner as the Secretary determines appropriate. (f) Definitions For purposes of this section: (1) Carbon-emitting generating unit The term carbon-emitting generating unit means a generating unit the operation of which results in the release of carbon dioxide to the atmosphere. (2) Eligible electricity provider The term eligible electricity provider means an entity in the United States that— (A) owns one or more generating units; and (B) sells the electricity generated by such generating units. (3) Generating unit The term generating unit has the meaning given such term in section 201 of the Clean Energy Innovation and Deployment Act of 2020 . (4) Qualified zero-emission electricity generating unit The term qualified zero-emission electricity generating unit means a generating unit— (A) that is placed into service after the date of enactment of this section