100 miles on each side
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Square with 100 mile sides:
10000 (square miles) = 2.6 × 10^10 m2
Each meter squared gets you 1000W of solar power.
This gives about 2.6x10^13W, or 26,000 GW.
Assume that conversion efficiency is 10% to electricity using solar concentrators (Ausra claims 30% efficiency). Divide that by 4 because you have sun 6 hours of the day, so you have 26,000GW/40 = 650 GW, or about what we need to power the USA.
The USA has 3.5 million square miles. 10,000 is about .3%.