(CNN) -- Hidden under a quaint resort 60 miles northeast of Fairbanks, Alaska, lies a treasure trove of potential energy that's free and available 24/7. "Imagineer" Bernie Karl and his wife, Connie, own Chena Hot Springs Resort near Fairbanks, Alaska. Alaskan entrepreneur Bernie Karl has pioneered modern technology to tap into one of Earth's oldest energy resources: hot water. Karl, 56, likes to call himself an "imagineer." Using imagination to fuel his engineering ambitions, this tenacious thinker and self-starter has figured out a way to generate electricity using water that's the temperature of a cup of coffee -- about 165 degrees Fahrenheit.
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Resort owner makes electricity with water the temperature of a cup of coffee
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Alaskan entrepreneur goes from diesel to geothermal, saving $625K in 3 years
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He invented portable geothermal generator that he says can power 250 homes
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MIT: Most of U.S. can be transformed into a huge geothermal power zone
Citing a 2007 @placeholder study, Karl said harnessing just 2 percent of Earth's internal energy could provide 2,000 times more energy than the entire planet currently consumes -- all free of polluting greenhouse gas emissions.