Why is geothermal energy considered a renewable resource

The heat of the Earth self-replenishes and so is considered renewable.

Geothermal energy refers to energy that is captured from the Earth’s crust ( geo referring to Earth and thermal referring to heat). This can be done a few ways:

  • the ground, for the first 10 feet or so, is a near constant temperature of 10 C – 16 C degrees. This can be used to cool and heat buildings by using a heat pump,
  • hot water from hot springs can be used for heating buildings or heating water,
  • steam from hot springs can spin turbines, making electricity

Because the heat of the Earth self-replenishes, it is considered renewable.

http://www.renewableenergyworld.com/geothermal-energy/tech.html

 

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