Tenn. Code § 7-52-306
Any municipality acting in its capacity as a taxing jurisdiction and any other taxing jurisdiction within the boundaries of which any part of such municipality's electric system is located are hereby authorized to, on and after July 1, 1987, from time to time, make and perform contracts for distribution among them of the tax equivalent amounts provided for in this part. Any such contract may provide for such distribution on any basis that is satisfactory to the contracting parties; provided, that the contract shall be consistent in all respects with this section and § 7-52-304. Nothing in this part shall have the effect of impairing in any way the obligations of the parties under any existing contract for such distribution in effect on July 1, 1987, or invalidating any established arrangement for such distribution in effect on July 1, 1987, and all such contracts and established arrangements are hereby expressly validated. For purposes of this part, an established arrangement is one under which the municipality has made a distribution payment to another taxing jurisdiction by general understanding, and the payment has been accepted by the taxing jurisdiction for the fiscal year or calendar year immediately preceding the fiscal year beginning July 1, 1987.
T.C.A. § 7-52-306