Wind is quietly blowing away coal, when it comes to supplying electricity in the US.In April, wind power generated more electricity than coal for the second month in a row, according to the latest available data from the Energy Information Administration. Wind briefly surpassed coal once before in April last year, but this time it’s by a much larger margin and for two consecutive months. Renewable energy production has been ticking up for years but only recently have fuels like wind and solar approached the ballpark of fossil fuels and nuclear power. Last year renewables made up 21% of electricity...