The cost of wind and solar power have fallen dramatically in recent years.
Still, renewables only account for a fraction of the energy produced in the United States.
One person confronting this issue sits in an office in Golden, Colorado.
His name is Martin Keller and he is the new boss at the National Renewable Energy Lab.
Keller, who hails from Germany, tells Inside Energy’s Dan Boyce the lab needs to spur more innovation to increase the amount of renewable energy available.