the third calendar year following such determination year, 25 percent, and (D) for a facility placed in service during any calendar year subsequent to the year described in subparagraph (C), 0 percent. (f) Definitions In this section: (1) CO 2 e per KWh The term CO 2 e per KWh means, with respect to any greenhouse gas, the equivalent carbon dioxide (as determined based on relative global warming potential) per kilowatt hour of electricity produced. (2) Greenhouse gas The term greenhouse gas has the same meaning given such term under section 211(o)(1)(G) of the Clean Air Act ( 42 U.S.C. 7545(o)(1)(G) ), as in effect on the date of the enactment of this section. (3) Qualified facility (A) In general Subject to subparagraphs (B) and (C), the term qualified facility means a facility which is— (i) used for the generation of electricity, and (ii) originally placed in service after December 31, 2020. (B) 10-year production credit For purposes of this section, a facility shall only be treated as a qualified facility during the 10-year period beginning on the date the facility was originally placed in service. (C) Expansion of facility