Associated Press: A nagging issue wound its way through the chatter at what was an otherwise celebratory event for the nation’s wind industry in Chicago. The U.S. has become the world’s biggest wind-power generator and of the electricity production added in the country last year, 42 percent came from wind turbines. But as more megawatts come on line, the problem of getting power from wind-swept plains to places where people actually live becomes more urgent. “In some ways we’re reaching the …