; and (C) by adding at the end the following new clause: (viii) qualified offshore wind property, but only with respect to property the construction of which begins before January 1, 2026, . (b) Qualified offshore wind property Subsection (c) of section 48 of the Internal Revenue Code of 1986 is amended by adding at the end the following new paragraph: (5) Qualified offshore wind property (A) In general The term qualified offshore wind property means an offshore facility using wind to produce electricity. (B) Offshore facility The term offshore facility means any facility located in the inland navigable waters of the United States, including the Great Lakes, or in the coastal waters of the United States, including the territorial seas of the United States, the exclusive economic zone of the United States, and the outer Continental Shelf of the United States. (C) Exception for qualified small wind energy property The term qualified offshore wind property shall not include any property described in paragraph (4). (D) Special rule In the case of any property described in subparagraph (A) which was placed in service after December 31, 2016, and for which a credit under this section was allowed by reason of subsection (a)(5) in any taxable year which ends before or includes the date of the enactment of the Offshore WIND Act , notwithstanding any election under such subsection (a)(5), such property may be treated at the election of the taxpayer as qualified offshore wind property (and not as qualified property which is part of a qualified investment credit facility) for— (i) taxable years including or beginning after such date of enactment, and (ii) any taxable years ending before such date of enactment, including by filing an amended return. Notwithstanding section 6501, an amended return may be filed for purposes of clause (ii) for any taxable year described in such clause. . (c) Effective date The amendments made by this section shall take effect on the date of the enactment of this Act.