Merits

1. Geothermal energy is the most versatile and least polluting renewable source of energy.
   
2. It can be harnessed for 24 hours throughout the year.
   
3. Geothermal energy is relatively inexpensive.
   
4. As compared to solar and wind energy, the power generation level of geothermal energy is higher.
   
5. Geothermal energy can be used for power generation as well as direct heat.
   

Demerits

1. It causes noise pollution while drilling.
   
2. Geothermal hot spots are scattered and usually some distance awa from the areas that need energy.
   
3. The overall power production has very low.
   
4. It's single bore has limied life span of about 10 years.