"A single kilometer‐wide band of geosynchronous earth orbit experiences enough solar flux in one year (approximately 212 terawatt‐years) to nearly equal the amount of energy contained within all known recoverable conventional oil reserves on Earth today (approximately 250 TW‐yrs). The enormous potential of this resource demands an examination of mankind’s ability to successfully capture and utilize this energy within the context of today’s technology, economic, and policy realities, as well as the expected environment within the next 25 years."

And,
"When all indirect and support costs are included, it is estimated that the DoD currently spends over $1 per kilowatt hour for electrical power delivered to troops in forward military bases in war regions. OSD(PA&E) has computed that at a wholesale price of $2.30 a gallon, the fully burdened average price of fuel for the Army exceeds $5 a gallon. For Operation IRAQI FREEDOM the estimated delivered price of fuel in certain areas may approach $20 a gallon."

That's interesting, I would thought it was closer to 50 cent a kw, but I believe mentioned this idea several years ago [without knowing the cost were actually that high. I think it would even make sense even if it were as low as 20-30 cents per kw. And as I mentioned at the time there should also be a fair amount of other markets [outdoor concerts, emergency condition in disaster areas, ect in which 20-30 cent a kilowatt would a cheap price to pay]

"Our Sun is the largest known energy resource in the solar system. In the vicinity of Earth, every square meter of space receives 1.366 kilowatts of solar radiation, but by the time it reaches the ground, it has been reduced by atmospheric absorption and scattering; weather; and summer, winter, and day‐night cycles to less than an average of 250 watts per square meter."

Hmm, I suppose if solar panel were passive, and one wasn't selecting areas which were best for solar energy [but instead used an average area on earth] this might be about right. On a clear day on the Earth surface and at noon, I believe, that normally one receives about 1000 watts per sq meter. And you lose a half of that due their being a nite, so in right locations and solar panels which could be directed towards the sun one would get around 500 watts on daily average.