220 ILCS 5/8-510
For the purpose of making land surveys and land use studies, any public utility that has been granted a certificate of public convenience and necessity by, or received an order under Section 8-503 or 8-406.1 of this Act from, the Commission may, 30 days after providing written notice to the owner thereof by registered mail and after providing a second notice to the owner of record, as identified in the records of the relevant county tax assessor, by telephone or electronic mail or by registered mail in the event the property owner has not been notified by other means, at least 3 days, but not more than 15 days, prior to the stated date in the notice, identifying the date when land surveys and land use studies will first begin on their property and informing the landowner that they or their agent may be present when the land surveys or land use studies occur, enter upon the property of any owner who has refused permission for entrance upon that property, but subject to responsibility for all damages which may be inflicted thereby.
220 ILCS 5/8-510