Here comes the sun. In 2016, U.S. solar generation almost doubled, from 7,493 megawatts in 2015 to a new annual record of 14,626 MW. For the first time in 2016, solar ranked as the No. 1 source of new generation capacity additions on an annual basis. The forecast calls for more of the same. The U.S. could install another 13 GW in 2017, doubling of U.S. solar capacity in just two years.