MI SB1231

Amends the general property tax act to define and classify wind energy systems as industrial personal property for tax purposes, effective for taxes levied after December 31, 2005.

Specifies that wind energy systems include turbines, rotors, generators, control systems, inverters, towers, foundations, support fixtures, storage systems, transformers, communication lines, weather monitoring equipment, and related underground/overhead lines until connection to the electricity grid.

Excludes wind energy systems from the utility personal property classification, ensuring they are assessed separately regardless of the classification of the underlying real property.

Requires assessors to classify wind energy systems as industrial personal property when used primarily for collecting, converting, transferring, or storing wind energy for electricity generation.

Maintains existing provisions for property classification disputes, allowing owners to protest classifications to the March board of review and appeal to the state tax commission by June 30.