Within 30 days after the passage of the ratifying vote provided for in section 2903 of this title or the vote provided for in section 2904 of this title, the mayor of the city, the selectboard of the town, or the trustees of the village shall notify in writing any utility engaged, at the time of the vote required by such sections, in generating or distributing gas or electricity for sale in such municipality, of such vote and request such utility whether it elects to sell and at what price, in the manner hereinafter provided, that portion of its plant and property located within such municipality which is suitable for and used in connection with the business of such utility, and that portion, if any, lying outside such municipality, which such municipality proposes to purchase.