Origin Of Geothermal Energy. Geothermal energy is thermal energy generated and stored in the earth. Earth’s heat is generated and restored by the radioactive decay of radioactive elements.

Heat from earth’s interior generates surface phenomena such as lava flows, geysers , fumaroles , hot springs , and mud pots. Geothermal energy from natural pools and hot springs has long been used for cooking, bathing, and warmth. In brief, the earth contains a significant amount of radioisotopes that are constantly decaying.