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NREL — National Renewable Energy Laboratory
The leading US research lab for solar, wind, and grid technology. Extensive free publications.
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Project Sunroof — Google ✦ FRQNCY PICK
Calculate the solar potential of any roof in the US. Instant estimate, actual data.
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PVWatts Calculator
Estimate the energy production and cost of solar photovoltaic systems worldwide. NREL's free tool.
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