Illinois offers a special assessment of solar energy systems for property-tax purposes. For property owners who register with a chief county assessment officer, solar energy equipment is valued at no more than a conventional energy system. Eligible equipment includes both active and passive solar-energy systems. The exemption is not valid for equipment that is equally usable in a conventional energy system or for components that serve non-solar energy generating (e.g., structural, aesthetic, insulating, etc.) purposes.
'''Application for Solar Assessment'''
Those who wish to have their solar energy property valued in this fashion must file the [http://www.co.stephenson.il.us/assessor/forms/PTAX_330.pdf State of Illinois PTAX-330 property tax form] with their local county assessor's office. Forms are available online and through each Illinois county assessor's office.