Electric cooperatives, as defined in Section 3.4 of the Electric Supplier Act, and public utilities that are owned and operated by any political subdivision, or municipal corporation of this State, or owned by such an entity and operated by any lessee or any operating agent thereof, hereinafter referred to as municipal systems, shall not be subject to the provisions of this amendatory Act of 1997, except as hereinafter provided in this Article XVII.
220 ILCS 5/17-100