A coalition of more than a dozen Schoharie County towns is suing the state, contending the prescribed method for taxing solar and wind farms is unconstitutional as it usurps the authority of local assessors and shortchanges municipalities of needed property tax revenue. And while state law dictates how solar and wind farms are assessed, local assessors are still required to defend the towns if the owner of a solar or wind farm contests their property tax bill, according to the suit.