Section 24. Lines for transmission of electricity which are electric power facilities, as defined in section one, shall, irrespective of the destination of the electricity to be transmitted thereover, be lines for the transmission of electricity for which an electric utility may petition under section seventy-two of chapter one hundred sixty-four for authority to construct and use, or continue to use, or to take by eminent domain under chapter seventy-nine lands, or rights-of-way or widenings thereof.