220 ILCS 25/4
The private energy entity shall be required to provide and to pay the total cost of the interconnection as well as any costs associated with providing a transmission capacity sufficient to handle that portion of the natural gas provided by the private energy entity that is over and above the capacity otherwise required by the public utility to service its utility customers and meet other authorized commitments. The public utility shall not be required to construct any additional gas facility on a system or to acquire any real property by eminent domain or otherwise for such facilities, in order to perform the service contemplated by this Act unless the costs of such additional facilities or acquisitions are to be borne by the private energy entity.
220 ILCS 25/4