thermal energy storage property
(6) Energy storage technology (A) In general The term “energy storage technology” means— (i) property (other than property primarily used in the transportation of goods or individuals and not for the production of electricity) which receives, stores, and delivers energy for conversion to electricity (or, in the case of hydrogen, which stores energy), and has a nameplate capacity of not less than 5 kilowatt hours, and (ii) thermal energy storage property. (B) Modifications of certain property In the case of any property which either— (i) was placed in service before the date of enactment of this section and would be described in subparagraph (A)(i), except that such property has a capacity of less than 5 kilowatt hours and is modified in a manner that such property (after such modification) has a nameplate capacity of not less than 5 kilowatt hours, or (ii) is described in subparagraph (A)(i) and is modified in a manner that such property (after such modification) has an increase in nameplate capacity of not less than 5 kilowatt hours, such property shall be treated as described in subparagraph (A)(i) except that the basis of any existing property prior to such modification shall not be taken into account for purposes of this section. In the case of any property to which this subparagraph applies, subparagraph (D) shall be applied by substituting “modification” for “construction”. (C) Thermal energy storage property (i) In general Subject to clause (ii), for purposes of this paragraph, the term “thermal energy storage property” means property comprising a system which— (I) is directly connected to a heating, ventilation, or air conditioning system, (II) removes heat from, or adds heat to, a storage medium for subsequent use, and (III) provides energy for the heating or cooling of the interior of a residential or commercial building. (ii) Exclusion The term “thermal energy storage property” shall not include— (I) a swimming pool, (II) combined heat and power system property, or (III) a building or its structural components. (D) Termination The term “energy storage technology” shall not include any property the construction of which begins after December 31, 2024 .