Exelon, the country's biggest nuclear utility, has presumably seen the writing on the Nuclear Retreat wall. It has announced an investment of as much as one billion dollars on wind turbines. Exelon is purchasing tractor-maker John Deere's John Deere Renewables, a wind energy manufacturer, whose 700+ megawatts of power capacity (when the wind's blowing) and 200MW+ of projects will be added to Exelon's power-generation division.