Subject to the provisions of this Charter, this City shall have authority to permit and regulate under such restrictions and conditions as it may set by ordinance and to grant nonexclusive franchises for the use of public streets, bridges or other public ways, structures or places above or below the surface of the ground for railroads and other routes and facilities for public conveyances, for poles, conduits, tunnels, towers and structures, pipes and wires and appurtenances thereof for transmission and distribution of electrical energy, signals and other methods of communication, for gas, steam and liquid fuels, for water, sewer and other private and publicly owned and operated facilities for public service. The power hereby granted shall be in addition to the franchise authority granted by general law to cities. No franchise shall be granted, renewed, amended or extended except by ordinance.