All revenues generated from the sale of electricity or in any way from the use of the electric distribution system, shall be deposited in board approved accounts. Payment shall be made to the City of Tuscumbia in accordance with the terms of the power contract between the Tennessee Valley Authority and the board and/or City of Tuscumbia then in effect. For the 2006-2007 fiscal year, the power contract requires payments to the City of Tuscumbia in lieu of taxes based on 4.7 percent of net plant value. The required payments to the City of Tuscumbia shall be made monthly and adjusted annually based on the required audit of the electric utility system.