65 ILCS 5/11-117-8
For the purpose of acquiring any public utility, or any part thereof, or property necessary or appropriate for the operation of any public utility, either by purchase, condemnation, or construction, any municipality may borrow money and issue negotiable bonds therefor, pledging the faith and credit of the municipality. But no such bonds shall be issued unless the proposition to issue the bonds has first been submitted to the electors of the municipality and approved by a majority of those voting thereon. The proposition shall be submitted in accordance with the provisions of Section 11-117-3. No such bonds shall be issued in an amount in excess of the cost of the municipality of the property for which the bonds are issued, and 10% of that cost in addition thereto.
65 ILCS 5/11-117-8