The deeper you go, the hotter it is
What is Geothermal Energy ?
It’s simply the heat energy of
the earth, generated by various
natural processes, such as:
1. heat from when the planet
and accreted, which has not yet
2.decay of radioactive elements
6. Extraction & uses
The heat energy can be brought to earth surface
directly from hot springs/ geysers
geothermal heat pump
Uses are broadly classified as:-
7. Direct use of Geothermal Energy
Hot springs, used as spas.
Heating water at fish farms.
Provide heat for buildings.
Raising plants in
Provides heat to
11. Dry Steam power plant(cont.)
The oldest type of Geothermal power plant used.
Geothermal reservoir containing pure steam is
required. Pure dry steam drives turbine.
Very rare type of geothermal power plant.
Operating at California, Italy, and Japan.
13. Flash steam power plant(cont.)
Commonly used geothermal power
Geothermal reservoirs containing both hot water &
steam is required.
Pressure changing system is required.
Operating at Hawaii, Nevada, Utah & some other
15. Binary cycle power plant(cont.)
Does not use steam directly to spin turbines.
Only the heat of the underground water is used.
Vapourizedhydrocarbons are used to spin the
turbine. Hydrocarbons having lower boiling point
as isopentane, isobutaneand propane can be used.
No harmful gas is emitted to the atmosphere
underground water is never disclosed to outside.
This’sthe worldwide accepted power plant.
Direct use of geothermal energy is absolutely cheaper
other energy sources.
Cost of electricity generation depends upon certain
Temperature and depth of
resource Type of resource
(steam, liquid, mix) Available
volume of resource
Size and technology of plant
18. Cost (cont.)
The initial investment is high.
But after certain time period, the cost of electricity
becomes comparable to other resources of energy.
US $0.05 to $0.08 (Rs. 2.772 to Rs. 4.4352) per
kWh Once the capital cost is recovered, the price
to below US $0.05 (Rs 2.2772) per
20. Geothermal Energy in India(cont)
Geothermal provinces are estimated to produce 10,600
of power (experts are confident only to the extent of 100
Geothermal provinces in India: the Himalayas, Sohana,
coast, Cambay, Son-Narmada-Tapi, Godavari, and
Reykjavík Geothermal will assist Thermaxto set up a pilot
project in PugaValley, Ladakh(Jammu & Kashmir)
s Available all the year around.
Does not involve any combustion of fuel.
Independent of weather
Clean Resource –Very little emissions or
overall environmental impact.
Economically Sound Alternative –The fuel
free, rate / KWh likely to be competitive
Overall, geothermal energy is a
nGeothermal heating system can replace fossil fuel
heating system in a particular area.
Annual costs for common heating purposes can be
by more than 60%.
Continued energy shortages have created added
geothermal energy for power generation.
Potential exists to provide all energy requirements in