Which energy technology uses the Earth’s internal heat?

Geothermal

Geothermal energy harnesses the heat stored beneath the Earth's surface to produce electricity and for direct heating. This energy source, both powerful and stable, is available 24/7, unlike other more intermittent renewable sources like solar and wind. Geothermal energy has the potential to play a significant role in the energy transition, providing clean and reliable energy. However, its exploitation depends on the specific geology of regions, making it more suited to certain locations than others.