65 ILCS 20/21-45
The city of Chicago shall have power and authority to require every public utility, as defined in this article, to make additions and extensions to its plant, equipment and property within the city, and from time to time to change the location of its plant, equipment and property in any street or other public way or public place within the control of the city, and to require and authorize any such public utility to make extensions of its service over such additional streets or other public ways or public places within control of the city of Chicago, as the city council may by ordinance determine; and any such public utility which has been so required or authorized by the city council shall have full power and authority to make such additions, extensions and changes of location without further authority or permission from the Illinois Commerce Commission.
65 ILCS 20/21-45