The Third Schedule
  

  

       XII. The price payable by the licensee for all electricity supplied to him by the Board in excess of the quantity specified in paragraph X shall be the Grid Tariff.

       XIII. The licensee shall have the right at any time on giving the Board prior notice in writing expiring at the end of a year of account of purchase at the Grid Tariff the whole of the electricity supplied to him by the Board.

        Provided that the Board in those circumstance may make it a condition that the licensee shall, until the date on which the agreed effective capacity of the station becomes nil, pay to the Board in each year of account in addition to the Grid Tariff a sum equal to such proportion as the Board may fix of the annual charges by way of interest and depreciation ascertained in respect of the year under paragraph IX :

        Provided further that after the expiration of the said notice, the licensee shall not be entitled at any time to purchase electricity from the Board at the price ascertained under paragraph XI.