Geothermal energy harnesses the natural heat from within the earth to generate electricity. It can be used in geothermal power plants built near volcanically or geothermally active areas, where steam or hot water is extracted through wells and used to power turbines that generate electricity. Geothermal heat pumps can also tap into shallow geothermal energy beneath the earth's surface to provide heating and cooling for buildings. Geothermal energy is a renewable resource as the earth continually produces heat from its core.

1. 1. Define Geothermal energy
2. Illustrate how geothermal energy is being harnessed
for human use
3. Displays awareness on the importance of volcanoes
as a source of energy.

3. The heat of the earth warms up water which is trapped in rock
formations beneath its surface and that heat from earth’s
interior becomes an energy source.
Geothermal = Geo (Earth) + Therm (Heat)
This renewable source constantly producing heat, thus, making
it inexustable to man kind.
It gets generated deep inside the earth’s core

4. The heat from deep inside the
earth is used to produce steam to
generate electricity.
GEOTHERMAL
POWER PLANTS
GEOTHERMAL
HEAT PUMPS
Tap into heat close to the
earth’s surface to heat water
or provide heat for buildings.

5. POWER PLANTS ARE BUILT IN AN AREA
WHERE IT IS PARTICULARLY HOT JUST
BELOW THE SURFACE AS NEAR A GROUP
OF GEYSERS, HOT SPRINGS OR
VOLCANIC ACTIVITY.
HOW GEOTHERMAL
POWER PLANTS WORK?
GEOTHERMAL
RESERVOIRS
Naturally occurring large areas of
hydrothermal resources.
DIFFERENT
GEOTHERMAL
RESERVOIRS
1. HOT WATER RESERVOIR: Reservoir of hot
underground water.
2. NATURAL STEM RESERVOIR: Reservoir coming
from the steam getting out from a hole dugged.
3. GEOPRESSURED RESERVOIR: Brine completely
saturated with natural gas in stored under
pressure from the weight of overlying rock.

6. GEYSERS
a rare kind of hot spring that
is under pressure and erupts,
sending jets of water and
steam into the air
HOT SPRINGS
spring produced by the
emergence of geothermally
heated groundwater onto the
surface of the Earth

7. HOW GEOTHERMAL POWER PLANTS
GENERATE ELECTRICITY?
1. Wells are drilled deep into the earth
to pump steam or hot water to the
surface.
2. When the water reaches the
surfaces, the drop in pressure
causes the water to turn into steam.
3. The stream spins a turbine, which is
connected to a generator that
produces electricity.
4. Cooling towers cool the steam,
making it to condense back to water.
5. The cooled water is pumped back
into the earth to begin the process
again.

8. (156) HOW A GEOTHERMAL
PLANT WORKS – YOUTUBE

9. Tiwi (Albay)
Kidapawan (North Cotabato)
Calaca (Laguna)
Tongonon (Leyte)
Bago City (Negros Occidental)
Valencia (Negros Oriental)
Bacon (Sorsogon)

11. 1. Water or a refrigerant moves through a
loop of pipes.
2. When the weather is cold, the water or
refrigerant heats up as it travels through
the part of the loop that's buried
underground.
3. Once it gets back above ground, the
warmed water or refrigerant transfers heat
into the building.
4. The water or refrigerant cools down after
its heat is transferred. It is pumped back
underground where it heats up once more,
starting the process again.
5. On a hot day, the system can run in
reverse. The water or refrigerant cools the
building and then is pumped underground
where extra heat is transferred to the
ground around the pipes.
HOW GEOTHERMAL HEAT PUMPS
WORK?

12. (156) ENERGY 101:

13. Do you think Geothermal Energy is a renewable
energy source?
Is Geothermal Energy harmful to the environment?
Is Geothermal Energy an important energy source?
How is it important?
If you were to decide, what source of electricity
would you go for, NATURAL GAS or
GEOTHERMAL ENERGY? Why or why not?

14. 1. 2. 3. 4. 5.
QUIZ TIME!

15. INDIVIDUALLY, bring the
following:
Long bond papers
Pencil
Coloring materials