For over 200 years, people in the U.S. have flocked to hot springs to get relief from the cold. In 1807, settlers founded the city of Hot Springs, Arkansas. 23 years after the city was founded, Asa Thompson charged $1 each for the use of three, spring-fed baths in wooden tubs thus resulting in the first known commercial use of geothermal energy.
(Source: U.S. Dept. of Energy)
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