65 ILCS 5/11-117-5
No ordinance authorizing the lease of any public utility owned by a municipality for a longer period than 5 years, nor any ordinance renewing any such lease, shall go into effect until the expiration of 30 days after its passage. The publication of the ordinance shall be accompanied by a notice of (1) the specific number of voters required to sign a petition requesting the question of authorizing the lease or renewing the lease of a public utility owned by a municipality for more than 5 years to be submitted to the electors; (2) the time in which such petition must be filed; and (3) the date of the prospective referendum. The municipal clerk shall provide a petition form to any individual requesting one. If, within this 30 days, there is filed with the municipal clerk of the municipality a petition signed by electors of the municipality equal in number to 10% or more of the number of registered voters in the municipality, asking that the ordinance be submitted to popular vote, then the ordinance shall not go into effect unless the question of its adoption is first submitted to the electors of the municipality and approved by a majority of those voting thereon. The question shall be submitted in accordance with the provisions of Section 11-117-3.
65 ILCS 5/11-117-5