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by Brakenshire 4033 days ago
The NREL have done this calculation, it comes out with a total figure of about 0.6% of the US landmass, 50 times less than the land allocated to growing crops. Although that figure includes Alaska, it gives a pretty good idea, and the state by state percentage areas to generate their share of US national electricity demand are also given:

http://www.nrel.gov/docs/fy08osti/42463.pdf