The United States demand for energy could be met by solar power if approximately 12,400 km^2 were covered in solar panels. This is about 0.127% of the the country and would be very expensive and time consuming to implement. The calculations and approximations that led to this conclusion are summarized in the table below:
Compared to similar analysis of the United States wind power potential, solar power is more conceivable because it would take up less area and solar panels could be mounted on roofs of buildings.
Sources:
http://en.wikipedia.org/wiki/United_States
http://shop.solardirect.com/index.php?Solar_PV_Electric&cPath=23&gclid=CP3z9_KfjqsCFUTBKgodESApxw
http://en.wikipedia.org/wiki/Solar_power
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