See more from Canary Media’s "Chart of the week” column . Wind and solar are on the rise worldwide — here are the 10 countries that rely on the clean-energy sources most for their electricity.

As another hot summer approaches, KSAT Explains went to a CPS Energy solar facility for a Q&A about how energy generated by the sun works, even when it's cloudy.

The highest research cell efficiency recorded in the chart is 47.6%, for a four-junction cell developed by Germany's Fraunhofer Institute for Solar Energy Systems (Fraunhofer ISE).