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.