AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
These sites have high geothermal gradients, meaning the Earth's interior heat reaches shallow depths. Groundwater absorbs this heat, turns into steam, which is used to drive turbines and generate electricity.
Source: Non-Conventional Sources of Energy, Geo Thermal Energy section
The key phrase examiners look for is "high geothermal gradient" — where temperatures are high at shallow depths, heating groundwater into steam. Mentioning the steam-driven turbine mechanism completes the answer. Avoid writing a general definition of geothermal energy; focus on the geological condition (heat gradient) that makes these specific sites suitable.