If we covered every suitable rooftop in the U.S. with solar panels, how much energy could we generate? The answer is pretty astounding: Enough to meet 39% of total demand, says a U.S. National Renewable Energy Laboratory report.
The new report employs new methods and data to update NREL’s estimate of rooftop potential. Its previous best guess was 664 gigawatts (GW) of installed capacity, compared to the 1,118 GW it thinks is possible now.