Correct Answer: Geothermal energy

Solution : The correct answer is geothermal energy.

Geothermal energy is a renewable source of energy which is generated inside the earth. It is produced by the radioactive day inside the core of earth. When such energy finds its way through the crust, it can be harnessed as a source for power generation. Manikaran in Himachal Pradesh, Puga valley in Jammu and Kashmir, Tapovan in Uttarakhand etc are some famous geothermal sites in India.