Robert Rapier calculates that the US 900GW electricity demand could be supplied by solar thermal plants 100 miles x 100 miles in area. Estimated installation cost = $6 trillion (what the US spends on oil in 8 years).
Lots of caveats to that calculation ... solar power isn't always there when you need it & doesn't run at anywhere near full capacity most of the time. But its still good to have ball park figures.
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