Geothermal energy is one of the potential alternative energy sources catering to both industrial and domestic energy requirements in many parts of the world. Presently, it is being used as a source for producing electricity mainly along active plate boundaries.

1. GEOTHERMAL ENERGY
POTENTIAL OF INDIA
By
Lalitha , 14004636

2. WHAT IS GEOTHERMAL ENERGY??
• The predominant source of the Earth’s heat is the gradual decay of long-
lived radioactive isotopes (40K, 232Th, 235U and 238U).
• Under the right conditions, water can penetrate into these hot rock zones,
resulting in the formation of high temperature geothermal systems
containing hot water, water and steam, or steam, at depths of 500 m to
3,000 m.

3. WHY GEOTHERMAL ENERGY??
• No pollution
• Produce electricity 24 hours a day.
• The greenhouse gas emissions are 45 grams of co2 per KWH of
electricity, or less than 5 % of that of conventional coal-fired plants
• The amount of heat within 10,000 meters of earth’s surface is 50,000 times
more energy than all the oil and natural gas resources in the world.

4. HOW IS GEOTHERMAL ENERGY
CAPTURED?
• Normally geothermal energy is captured from
geothermal hotspots.
• Hot Springs for Geothermal Power Plants-
‘hydrothermal convection’
• Direct uses of Geothermal Heat
• Ground-source heat pumps- heating and cooling to
buildings

5. HOW ELECTRICITY IS PRODUCED
FROM GEOTHERMAL ENERGY ?

6. Advantages and limitations of
Geothermal Energy
• Clean, inexpensive and renewable energy.
• If harnessed correctly, it leads to no harmful by-products
• Small and have little effect on the natural landscape, or the
nearby environment.
• No fuel is used. Running & Maintain costs are very low.
• Moreover, the cost of the land to build a geothermal power
plant, is usually less as compared to the cost of constructing an
oil, gas, coal, or nuclear power plant.

7. • If harnessed incorrectly, produce pollutants.
• Improper drilling into the earth can release
hazardous minerals and gases from deep down
inside the earth, which can be contained quite
easily.
• They may run out of steam in the long run.

8. PROSPECTS OF GEOTHERMAL
ENERGY IN INDIA
• Geological Survey of India has identified about 340
geothermal hot springs in the country.
• These springs are grouped into seven geothermal provinces i.e.
Himalayan (Puga, Chhumathang), Sahara Valley, Cambay
Basin, Son-Narmada-Tapi (SONATA) lineament belt, West
Coast, Godavari basin and Mahanadi basin.
• Puga is considered to be a good potential of geothermal
energy. In Puga valley, hot spring temperatures vary from 30 C
to 85 C (boiling point at Puga) and discharge up to 300 litres
/minute.
• A total of 34 boreholes ranging in depths from 28.5 m to 384.7
m have been drilled in Puga valley.

10. MAJOR AND REPRESENTATIVE INDIAN
GEOTHERMAL PROVINCE

13. Companies undertaken projects
• Panx GEOTHERMAl – puga valley
• Geosyndicate power private limited –
AP(Aswaraopet)
• LNJ Bhilwara
• TATA power
• THERMAX
• NTPC
• AVIN ENERGY SYSTEMS

14. India’s first geothermal plant to come up in Chhattisgarh. Ntpc has
already started exploratory and preparatory work in this area. It has
also started talks with oil and natural gas corp and international
organisations for drilling operation.

15. Conclusion
• Around 6.5 per cent of electricity generation in the
world would be done with the help of geothermal
energy.
• Geothermal stations use 404 square meters
per GW·h versus 3,632 and 1,335 square meters for
coal facilities and wind farms respectively. They use
20 litres of freshwater per MW·h versus over
1000 litres per MW·h for nuclear, coal, or oil.
• One geothermal power project has a capacity of 25MW.
• power at Rs 3.50-4 per unit, the same as a coal-based
plant."