Reuters: Electric utility Exelon Corp said it will buy Deere & Co’s wind power business for about $860 million, expanding its portfolio of carbon-free electricity generation. Exelon, the largest U.S. nuclear power operator, said the acquisition of John Deere Renewables will add 735 operating megawatts (MW) of clean energy to its portfolio, which currently includes about 1,000 MW of renewable power. The deal includes a provision for an additional payment of $40 million for …