1. What is Geothermal Energy
It’s simply the heat energy of the earth generated by various natural process such as;
Heat from when the planet formed and accreted which has
not yet been lost.
Decay of radioactive
elements
Friction

2. Geothermal Power
Hot rocks underground heat water to produce steam. We drill holes down to the hot region, steam comes up, is purified and used to drive turbines, which drive electric generators.
There may be natural "groundwater" in the hot rocks anyway, or we may need to drill more holes and pump water down to them.

3. Geothermal Reservoirs
Reservoirs can be found in the areas where we find :
Hot springs
Boiling mud pot
Volcano

4. Geothermal Reservoirs
The rising hot waster and steam is trapped in rocks to form a geothermal reservoirs.
Reservoirs can be discovered by
Testing the soil
Analyzing under temperature

5. Extraction and Uses
The heat energy can be brought to earth surface by flowing ways.
Directly from hot spring
Geothermal het pump
Uses are classified as
Direct use
Indirect use

6. Direct use of Geothermal Energ
Hot springs used as spas.
Heating water at fish farms.
Provide heat for building.
Provide heat to
industrial processes

7. Indirect use of Geothermal Energy
Electricity Generation:

8. Electricity Generation
There are 3 types of power plants
Dry steam power plant
Flash steam power plant
Binary cycle power plant

9. Dry steam power plant

10. Dry steam power plant 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.

11. Flash steam power plant

12. Flash steam power plant
Commonly used geothermal power plant.
Geothermal reservoirs containing both hot water & steam is required.
Pressure changing system is required.
Operating at Hawaii, Nevada, Utah & some other places

13. Binary cycle power plant

14. Binary cycle power plant
Does not use steam directly to spin turbines.
Only the heat of the underground water is used.
Vapourized hydrocarbons are used to spin the turbine.
No harmful gas is emitted to the atmosphere because the underground water is never disclosed to outside.
This’s the worldwide accepted power plant.

15. Turbine and generator

16. Cost
Direct use of geothermal energy is absolutely cheaper than other energy sources.
Cost of electricity generation depends upon certain factors:
Temperature and depth of resource
Type of resource (steam, liquid)
Available volume of resources
Size and technology of plant

17. Advantages to Geothermal Power
. Geothermal energy does not
produce any pollution, and
does not contribute to the
greenhouse effect.
The power stations do not take up much room, so there is not much impact on the environment.
No fuel is needed.
Once you've built a geothermal power station, the energy is almost free. It may need a little energy to run a pump, but this can be taken from the energy being generated.

18. Disadvantages to Geothermal Power
The big problem is that there are not many places where you can build a geothermal power station. You need hot rocks of a suitable type, at a depth where we can drill down to them. The type of rock above is also important, it must be of a type that we can easily drill through.
Sometimes a geothermal site may "run out of steam", perhaps for decades.

19. Is it Renewable? Geothermal energy is renewable.
The energy keeps on coming, as long as we don't pump too much cold water down and cool the rocks too much.

20. How it works

21. Quizzes
Geothermal power means getting energy from ___ rocks underground. This is ___ so as long as we don’t take too much energy out and cool the rocks too much.
Hot ___comes up out of the hole we’ve drilled and usually turns into ___. This can drive turbines and generators to make ___.
At some sites we have to ___ water down at others hot water comes up anyway. Sometimes poisonous ___ com up too.
Geothermal power can occasionally unreliable, and therer are not many suitable ___ because there needs to be the right type of ___ at a ___ we can reach underneath rock which isn’t too hard to ___ through

22. Ans Depth Drill Electricity Energy Gases Hot Pump Renewable Rock Sites
Steam
water