220 ILCS 15/6
Upon receiving an order approving such gas storage project, such corporation shall have the right to utilize for the storage project so approved any geological stratum or formation required thereby, lying more than five hundred feet below the surface (but not including the surface) of any real estate owned by the State of Illinois, or owned by any political subdivision, including, but not restricted to, any municipal corporation or quasi-municipal corporation, of the State of Illinois. Such corporation shall as a condition of such utilization of real estate owned by such a political subdivision pay thereto compensation in an amount ascertained in the manner provided by the law of eminent domain. Such corporation shall as a condition of such utilization of real estate owned by the State of Illinois pay to the State Treasurer a reasonable compensation therefor in such amount as may be determined by the Illinois Commerce Commission.
220 ILCS 15/6