(a) As used in this Code section, the term "TVA" means the Tennessee Valley Authority.

(b) Payments made by the TVA to the state and any of its political subdivisions under 16 U.S.C.A. Section 831(l), as amended, shall be apportioned among the political subdivisions in which property owned by the TVA is located on the basis of the percentage of loss of taxes to each to be determined as provided in this Code section. The payments made for each fiscal year by the TVA shall be distributed by the commissioner among counties and municipalities in which the TVA had power property including, but not limited to, reservoir land allocated to power purposes, at the end of the preceding fiscal year, in such manner that the sum of such payments plus the total amount of payments for the same fiscal year made by the TVA directly to counties of the state shall be apportioned among the counties and municipalities in the same ratio that the book value of the TVA's power property in each county and in each municipality, respectively, bore as of the end of the preceding fiscal year to the total amount of the book value of the TVA's power properties in all counties within the state, plus the book value of the TVA's power properties located in all municipalities within the state. The apportionment shall be subject to any adjustments necessary to meet the conditions set forth in subsections (c) and (d) of this Code section. The amount distributed by the commissioner under this Code section to any county or municipality in which is located an independent school district shall be divided between the county or municipal government and the county or municipal school system based upon the ratio that the tax rate for the previous tax year for each bears to the total rate for both for the previous tax year.

(c) All payments in lieu of taxes made by the TVA directly to any county for any fiscal year shall be retained by the county. The direct payment shall be deducted from the amount finally apportioned to the county under subsection (b) of this Code section before distribution of the balance, if any, of the county's payment share for the particular fiscal year from the state.

(d) If the initially apportioned payment share of any county for a fiscal year is less than the amount of payment made directly to the county by the TVA under 16 U.S.C.A. Section 831(l), the amount due the county shall be increased to conform to the requirements of 16 U.S.C.A. Section 831(l), and the previously apportioned shares of all other counties and municipalities shall be reduced pro rata so that the total of the reductions shall equal the total of increases necessary to meet the minimum payment requirements of this Code section.