On June 14, the U.S. Energy Information Administration (EIA) reported a landmark development in U.S. power markets: "For the first time, monthly electricity generation from wind and solar (including utility-scale plants and small-scale systems) exceeded 10% of total electricity generation in the United States." As you can see from the graphic below, this isn't a fluke; to the contrary, wind and solar have been growing inexorably for years now, and there's certainly no sign that this will stop any time soon.