65 ILCS 5/11-15.5-10: Prohibitions.

Notwithstanding any provision of this Code or other provision of law, the adoption of any ordinance or resolution or the exercise of any power, by municipality that prohibits or has the effect of prohibiting the installation of a solar energy system or low-voltage solar-powered devices is expressly prohibited. Municipalities that own local electric distribution systems may adopt and implement reasonable policies, consistent with Section 17-900 of the Public Utilities Act, regarding the interconnection and use of solar energy systems.