More solar energy was added in 2016 than natural gas or wind

Photovoltaic solar power field at Volkswagen plant in Chattanooga, TennesseeRenewable-energy growth has accelerated in 2016, but this may go down as a milestone year for one renewable-energy source in particular. Together, all renewable-energy sources are expected to account for 8 percent of U.S. electricity-generation capacity in 2017, according to the Department of Energy, and solar energy is responsible for most of...