The daily average insolation on the earth surface is approximately 6 kWh/m2 (ignoring cloudy weather). If a commercially available solar panel can achieve an energy conversion efficiency of 20%, what is the area that is required to supply the electricity demand of the US in 2014 (the population was about 324 million and the average per capita power was 1378 watts). What is the fraction (or multitude) of Tennessee (109,250 km2) that is required to power the entire US.
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