USA Today: Renewable energy continues to grow in the U.S., especially solar; but its drawing fewer investments as the cost of its technology falls and natural gas stays cheap. U.S. wind energy, although 43 percent cheaper to produce now than four years ago, saw a significant slowdown in its growth in 2013, according to a report released Thursday by the American Wind Energy Association. It added a record 13,131 megawatts of power in 2012, but that fell 92 percent to only 1,087 megawatts last year the lowest...