220 ILCS 30/4
By October 1, 1965, or within such further reasonable time as may be fixed by the Commission, each electric supplier shall make and file with the Commission such map or maps as will clearly indicate the location in this State of the supplier's existing lines. On November 1, 1965, or within such further reasonable time as the Commission may determine, the Commission shall find to be accurate those maps to which no objection has been filed under this Section. If before November 1, 1965, or before the end of such a reasonable time period determined by the Commission, an electric supplier who may be adversely affected by an inaccurate map files with the Commission a written objection to any map, the Commission shall set a hearing on such map or maps and give reasonable notice to the electric supplier filing the map and to the supplier filing the objection. At the hearing, the Commission shall determine on the basis of the evidence presented whether or not each map is accurate. After its determination the Commission shall find to be accurate each map in question or require that a revised map, made in accordance with its determination, be promptly filed which when filed shall be found to be accurate by the Commission.
No public utility is required, however, to file a map showing its existing lines in any county in which there are no existing lines of an electric cooperative and which is not adjacent to a county in which there are existing lines of an electric cooperative; and no electric supplier needs to indicate on such a map, except as otherwise required by the Commission, any existing line which is more than 5 miles away from an existing line of another supplier.
No electric supplier is required to file a map showing its existing lines in any incorporated municipality except that, if 2 or more electric suppliers are furnishing electric service on the effective date of this Act in any incorporated municipality, each such supplier shall file a map showing the location of its existing lines in the portion of the incorporated municipality where those lines are adjacent to the existing lines of another electric supplier.
Such maps found to be accurate by the Commission as provided in this Section are public records of the Commission and are prima facie evidence of the location of the existing lines thereon portrayed.
220 ILCS 30/4