“Energy has to be reliable, and when the sun isn’t shining and the wind isn’t blowing, you still need energy. So the whole system designed in terms of storage and transmission gets quite complex. Wind and solar can be a part of your mix, but you can’t do much with them without a storage miracle. The “intermittency” of solar and wind makes it unviable, compared with other sources like nuclear energy and new technologies for storage. ”

—  Bill Gates, former Microsoft CEO and co-founder of the world’s biggest charitable foundation, on why he thinks solar and wind energy may not be the most viable sources of electricity in the future.