Photos: Top fifteen inventions and innovations of the National Renewable Energy Lab

In this week's feature, "Sun Burn," we go inside the National Renewable Energy Lab -- the federal facility in Golden that has for 35 years been dedicated to innovations in energy efficiency. In print, we take an in-depth look at NREL's important role in solar energy and other industries over the past three decades. Here, we count down the top fifteen inventions and innovations NREL leaders tout as the lab's key accomplishments.
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Sam Levin
Contact: Sam Levin