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How Geothermal Heat Pumps Could Power the Future

The term "geothermal energy" might bring to mind hot springs and billows of steam rising from the soil, but you can get energy from the ground without moving to Iceland or Yellowstone. You just need a geothermal heat pump.

"We call anything below the ground geothermal," said John Lund, director of the Geo-Heat Center at the Oregon Institute of Technology.
This includes geothermal heating, in which hot underground water is used to heat a building, and geothermal power, in which steam from very hot underground rock (more than 300 degrees Fahrenheit) is used to drive an electric generator.

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