In order to provide the special reduced rates mandated or authorized by sections one and five of this article and still maintain the integrity of the earnings of the utilities offering service under these rates, the commission shall each year, determine, upon application by any affected utility, that utility's revenue deficiency resulting from the special reduced rates. Upon determining any utility's revenue deficiency, the commission shall issue an order certifying the amount of that deficiency. Certified revenue deficiencies shall be recovered by the affected utilities as follows:

1. (1) A utility's certified revenue deficiency, if any, resulting from the special reduced rates shall be allowed as a tax credit against the liability of the utility pursuant to the provisions of article thirteen-f of chapter eleven of this code.
2. (2) After allowance of a tax credit pursuant to the provisions of article thirteen-f of chapter eleven, a utility's remaining revenue deficiency, if any, resulting from the special reduced rates, shall be allowed as a tax credit against the liability of the utility pursuant to the provisions of section eleven, article twenty-four of chapter eleven.