GLENVILLE, Minn. – Wind turbines have become as commonplace in parts of the rural Midwest as tree-sheltered farmhouses, gray-metal grain bins and deeply furrowed fields. The slowly spinning blades are a sign of investment in a region that often has few growth opportunities to brag about. But when a developer sought to put up dozens more of the 400-foot towers in southern Minnesota, hundreds of people in the heart of wind country didn’t celebrate. They fought back, going door-to-door to alert neighbors and circulating petitions to try to kill the project. They packed county board meetings, hired a lawyer and pleaded their case before state commissions.