This clause provides that the provincial Government shall have the option to acquire the undertaking at any time October 21 1950, provided firstly That not less than one Year , ' notice in writing of the election to acquire shall be served upon the supplier by the Provincial Government; provided secondly that the generating station shall not form part of the undertaking for the purpose of acquisition if the undertaking is acquired after grid supply from the East Punjab Public Works Department, Electricity Branch, has reached Muktsar; provided thirdly that the price to be paid to the supplier for such lands, buildings, works, materials and plant as may be acquired by the Provincial Government under this clause will be the fair market value at the time of purchase (without any addition in respect of compulsory purchase or of goodwill or of any profits which may be or might have been made from the undertaking) such value to be in case of difference or dispute determined by arbitration in the manner prescribed in section 52 of the Act; provided fourthly that the Provincial Government shall pay the price of the property acquired under this clause within a period of six months after the price has been determined." Mr. Veda Vyas, for the petitioners, contends that the condition which gives respondent 1 the option to acquire the property of the petitioners is ultra vires.