(a) In the case of the tax imposed by this chapter upon a distributor of gas or electricity commodities and services that is attributable to gross receipts or tariff charges received from a corporation that satisfies the requirements of § 2011(a) of this title for the allowance of a credit against the tax imposed by Chapter 19 of this title (relating to corporation income tax) for the taxable year of such corporation in which a qualified facility (as defined in § 2010(1) of this title) is placed in service by such corporation (within the meaning of § 2010(7) of this title), such corporation shall be allowed a rebate of the tax payable by such distributor for such corporation's taxable year in which such qualified facility is placed in service and for any of its 4 following taxable years in which such facility is a qualified facility with respect to such corporation on the last business day thereof. The amount of the rebate allowable to such corporation in each such taxable year shall be equal to 50 percent of the amount of the tax imposed by this chapter (computed without regard to this subsection, but computed with regard to subsection (a) of this section, if applicable) upon such distributor that is attributable to that portion of the tariff or other similar charge paid or payable to such distributor by such corporation on account of such taxable year that (1), if such qualified facility is a new facility within the meaning of § 2010(4) of this title, is allocable to the volume of such gas and electricity commodities and services consumed in the operation of such new facility during such taxable year, or (2), if such qualified facility is an expanded facility within the meaning of § 2010(5) of this title, is allocable to the excess, if any, of (i) the volume of such gas and electricity commodities and services consumed during such taxable year in the operation of that facility of which such expanded facility is a part, over (ii) the volume, if any, of such commodities and services consumed by such corporation or a related person (within the meaning of § 2010(10) of this title) in the operation of that same facility during such corporation's taxable year immediately preceding its taxable year in which such qualified facility is placed in service by such corporation. For purposes of this subsection, the amount of any tariff or other similar charge that shall be deemed allocable to the volume of any specific commodities and services shall be the excess of (1) the total amount of such tariff or charge, over (2) the amount of such tariff or charge computed without including such volume of commodities and services in the base for computing such tariff or charge.
(b) For purposes of this section, the taxable year of any person shall be the year used by such person in computing liability for Delaware income tax.