The Ohio Supreme Court just ruled in favor of an off-shore wind farm in Lake Erie, after a two year court fight.
Similar to Lake Erie, Lake Michigan is mostly shallow (compared to Huron or Superior) so it is a low cost choice for off-shore wind, and close to load.
I would expect that because of the wind profile (the best in the Midwest) that Ocean sized turbines will be proposed. The FAA has already indicated in a presentation that they expect wind turbines in all the great lakes eventually.
It will be interesting to see who steps up to oppose Lake Michigan turbines and on what grounds?