220 ILCS 5/8-502
Whenever the Commission, after a hearing had upon its own motion or upon complaint, shall find that public convenience and necessity require the use by one public utility of the conduits, subways, wires, poles, pipes or other property or equipment, or any part thereof, on, over or under any street or highway, belonging to another public utility, and that such use will not prevent the owner or other users thereof from performing their public duties nor result in irreparable injury to such owner or other users of such conduits, subways, wires, poles, pipes or other property or equipment, or in any substantial detriment to the service, and that such public utilities have failed to agree upon such use or the terms and conditions or compensation for the same, the Commission may, by order, direct that such use be permitted and prescribe a reasonable compensation and reasonable terms and conditions for such joint use. If such use be directed, the public utility to whom the use is permitted shall be liable to the owner or other users of such conduits, subways, wires, poles, pipes or other property or equipment, for such damage as may result therefrom to the property of such owner or other users thereof.
220 ILCS 5/8-502