In November 2019, Michigan enacted H.B. 4465, establishing a property tax exemption for renewable energy systems. To qualify for the exemption, systems must be no larger than 150 kW in capacity and must offset all or a portion of the energy used on the property.
A bulletin explaining the exemption is available here: https://www.michigan.gov/-/media/Project/Websites/treasury/Letters/Bulletins/Bulletin_6_of_2020_Alternative_Energy_Systems.pdf?rev=3090eee942f0432c964fb494ca63749c