The privilege is hereby granted to any person, firm or corporation, organized under the laws of the State of California, to lay down, maintain and operate in the public streets and thoroughfares of the City and County of San Francisco, pipes, wires and conduits, and connections therewith, so far as may be necessary for introducing into and supplying said city and its inhabitants with gas and electricity for lighting, heating and power purposes, upon the terms and conditions set forth in Section 671 to 680, inclusive, of this Article.