Energy.gov, Nov. 14, 2016.
http://energy.gov/eere/articles/4-charts-show-renewable-energy-rise-America

"The numbers are in and the verdict is clear: clean energy is on the rise, both at home and around the world. Last week..., the National Renewable Energy Laboratory in Colorado, released the 2015 Renewable Energy Data Book. This annual publication illustrates the rapid progress that the United States and globe has seen on a variety of energy metrics over the past year – including electricity generation, investments, and technology-specific data."