Ala. Code § 45-17A-83.05
The board is authorized to establish all utility rates for the City of Tuscumbia public utility system. Any electric rate adjustment must be approved by the Tennessee Valley Authority before implementation. Any water or sewer rate adjustment shall be made in accordance with the American Water Works Association Manual of Water Supply Practices M-1, latest edition. Any gas rate adjustment shall be made in accordance with the American Public Gas Association average cost of gas method. In the event one of the standards or methods of establishing utility rates set out herein is unavailable for any reason, the board and the city council must agree upon a new standard or method of establishing rate adjustments by the board.
Ala. Code § 45-17A-83.05 (1975)