15 Solar Projects You've Gotta See

Looking Back at Recent PV Innovations
Energy. The lifeblood of modern civilization. Finding clean sources of it is very high on the green movement's priority list, and one very promising field is solar photovoltaics (PV). We, at TreeHugger, have been covering the field for a while now, and we think it's time to look in the rearview mirror at some of the top PV solar innovations from our archives.

Thin Film Solar Record: 19.9% Efficiency
A shortage of silicon in the past few years and the demand for thin and flexible panels has helped increase the focus on thin film solar recently, and a lot of progress is being made. The US National Renewable Energy Laboratory (NREL) has created thin film solar panels that are very close to competing with their more traditional silicon-based cousins. "The copper indium gallium diselenide (CIGS) thin-film solar cell recently reached 19.9 percent efficiency in testing at the lab, setting a new world record."

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