Pub. Util. Code, § 10101

There is granted to every municipal corporation of the State the right to construct, operate, and maintain water and gas pipes, mains and conduits, electric light and power lines, telephone and telegraph lines, sewers and sewer mains, all with the necessary appurtenances, across, along, in, under, over, or upon any road, street, alley, avenue, or highway, and across, under, or over any railway, canal, ditch, or flume which the route of such works intersects, crosses, or runs along, in such manner as to afford security for life and property.