In full sunlight, 100 watts of solar energy hit the earth per square foot. There are 27,878,400 square feet per square mile, and perhaps 12 hours of sunlight per day, so the sun provides earth with 12.2 trillion watt-hours per square mile per year. According to http://www.ecoworld.com, this translates to 274 million gigawatt-years of solar energy or 8.2 million “quads” of Btu energy per year.
This is a tiny fraction of the sun’s overall power, considering the fact that the Sun is 1287000 km bigger than the Earth.
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