The Cooperative shall have the right to erect and maintain all necessary poles and to place thereon the necessary wires, fixture and accessories as well as excavate and bury conductors and install and place other underground electric system facilities and fixtures for the distribution of electric power and energy in and through the City. New electric distribution lines in new developments within the City shall be installed underground unless otherwise approved by the City. Said facilities shall not unreasonably interfere with the construction of any water pipes, drain or sewer, or the flow of water therefrom, which have been or may hereafter be located by authority of the City.