50 ILCS 515/15
Sealed proposals must be opened by a member of the unit of local government's governing body or an employee of the unit of local government at a public opening at which the contents of the proposals must be announced. Each person or entity submitting a sealed proposal must receive at least 10 days notice of the time and place of the opening. The unit of local government shall select the qualified provider that best meets the needs of the unit of local government. The unit of local government shall provide public notice of (i) the meeting at which it proposes to award a guaranteed energy savings contract, (ii) the names of the parties to the proposed contract, and (iii) the purpose of the contract. The public notice shall be made at least 10 days prior to the meeting. After evaluating the proposals under Section 10, a unit of local government may enter into a guaranteed energy savings contract with a qualified provider if it finds that the amount it would spend on the energy conservation measures recommended in the proposal would not exceed the amount to be saved in either energy or operational costs, or both, within a 10 year period from the date of installation, if the recommendations in the proposal are followed.
50 ILCS 515/15