30 ILCS 725/4.1

The Department may conduct policy studies in conjunction with appropriate state agencies. The Department, in cooperation with appropriate state agencies, shall develop an incentive program for encouraging the construction and use of cost effective solar energy systems within this state. The Department shall make recommendations concerning findings to the Illinois Commerce Commission. The incentive program shall include: (a) Study of laws, regulations, ordinances, rules and plans for the purpose of determining the extent to which such laws, regulations, ordinances, rules and plans inhibit or encourage the use of solar energy systems; (b) Study of the market penetration of solar energy system; and (c) Study of solar skyspace protection.