The U.S. Energy Department released a new report predicting a huge drop in the cost of wind energy by 2030, but Amazon is not waiting around for that to happen. The company is already heavily invested in wind energy and just signed on to buy 90 percent of the output from a new 235-megawatt wind farm in Scurry County, Texas. The news comes with an interesting political twist. Amazon founder Jeff Bezos is a huge fan of renewable…