Guest blogger Cameron Atwood sent me this graph showing the increase in the use of solar and wind energy from 2005 to 2012. Impressive stuff. Here in the U.S., our grid-mix is currently comprised of more than 4% wind and about 1% solar – both of which are rising steadily.
Of course, due to the variable nature of these resources, we’ll eventually need a significant amount of energy storage, whether it’s in the form of advanced batteries, compressed air, hydrogen, ammonia, synthetic fuels, flywheels, pumped hydro, advanced rail, etc. Insofar as this subject is bound to become important, our list of clean energy investment opportunities contemplate several of these various forms of energy storage.
