(5) All such contracts entered into by the State Government for supply of electrical energy based on or connected with the generation of electricity from the Rihand Hydro Electric Generating Station to any consumer and any contract entered into by the Board on or after April 1, 1965 for the supply of electrical energy to such consumer shall operate subject to the modifications specified in the following clauses, which shall have effect from the date of the commencement of the Electricity Laws (Uttar Pradesh Amendment) Act, 1983 (hereinafter referred to as the said date): 161 (a) the rates to be charged by the Board for the energy supplied by it to any consumer under any contract for which the payment will be due for the first time on or after the said date shall be such as may with the previous approval of the State Government be fixed by the Board, having due regard to the geographical position of the area of supply, the nature of the supply and purpose for which supply is required and any other relevant factor.