; and (ii) in clause (ii), by striking after December 31, 2020, and before January 1, 2022 and inserting after December 31, 2025, and before January 1, 2027 ; and (B) in subparagraph (B), by striking January 1, 2024 and inserting January 1, 2029 . (c) Effective date The amendments made by this section shall apply to periods after December 31, 2019. 3. Enhancing the energy credit for microturbines, combined heat and power systems, geothermal heat pumps, and geothermal energy (a) In general Section 48(a)(2)(A)(i) of the Internal Revenue Code of 1986 is amended— (1) by striking subclause (I); (2) by redesignating subclause (II), as amended by section 2 of this Act, as subclause (I); (3) by inserting after subclause (I), as redesignated by paragraph (2), the following: (II) energy property described in paragraph (3)(A)(iii) but only with respect to property the construction of which begins before January 1, 2027, and ; (4) by amending subclause (III) to read as follows: (III) energy property described in clause (ii), (iv), (v), (vi), or (vii) of paragraph (3)(A), and ; and (5) by striking subclause (IV). (b) Effective date The amendments made by this section shall apply to periods after December 31, 2019, in taxable years ending after such date, under rules similar to the rules of section 48(m) of the Internal Revenue Code of 1986 (as in effect on the day before the date of the enactment of the Revenue Reconciliation Act of 1990). 4. Extension and phaseout of credit for residential energy efficient property (a) Applicable percentage Subsection (g) of section 25D of the Internal Revenue Code of 1986 is amended— (1) in paragraph (1), by striking January 1, 2020 and inserting January 1, 2025 ; (2) in paragraph (2), by striking after December 31, 2019, and before January 1, 2021 and inserting after December 31, 2024, and before January 1, 2026