20 ILCS 3953/10

"Energy conservation project" and "project designed to reduce energy consumption and costs" mean any improvement, repair, alteration or betterment of any building or facility or any equipment, fixture or furnishing to be added to or used in any building or facility that the Director of Commerce and Economic Opportunity has determined will be a cost effective energy related project that will lower energy or utility costs in connection with the operation or maintenance of such building or facility, and will achieve energy cost savings sufficient to cover bond debt service and other project costs within 7 years from the date of project installation.