Geothermal Energy Lesson 8
Geothermal Energy Lesson 8
Geothermal Energy Lesson 8
G R O U P 5 L E S S O N 8 P R E S E N T A T I O N
GEOTHERMAL
ENERGY
GEO - means "EARTH"
THERME - means "HEAT"
Geothermal energy is the thermal
energy in the Earth's crust which
originates from the formation of the
planet and from radioactive decay of
materials. The high temperature and
pressure in Earth's interior cause some
rock to melt and solid mantle to
behave plastically.
Geothermal energy is a type of renewable energy taken
from the Earth’s core. It comes from heat generated
during the original formation of the planet and the
radioactive decay of materials. This thermal energy is
stored in rocks and fluids in the centre of the earth.
How is GEOTHERMAL
ENERGY generated?
GEOTHERMAL ENERGY is generated in two ways:
Thermal Energy also called Heat Energy is produced when a rise in Temperature causes
atoms and molecules to move faster and collide with each other.
Mechanical energy- arises due to an object’s position and motion and results in work.
Electrical Energy is a form of energy resulting from the flow of electric charge
WHAT ARE THE 1. Environmentally Friendly
ADVANTAGES OF 2. Renewable
USING 3. Huge Potential
GEOTHERMAL?
4. Sustainable / Stable
5. Heating and Cooling
6. Reliable
7. No Fuel Required
8. Rapid Evolution
• ENVIRONMENTALLY
Geothermal energy is more environmentally friendly
than conventional fuel sources such as coal and other
fossil fuels. In addition, the carbon footprint of a
geothermal power plant is low. While there is some
pollution associated with geothermal energy, this is
relatively minimal when compared to fossil fuels.
• RENEWABLE
Geothermal energy is a source of renewable energy
that will last until the Earth is destroyed by the sun
in around 5 billion years. The hot reservoirs within
the Earth are naturally replenished, making it both
renewable and sustainable.
• HUGE POTENTIAL
Worldwide energy consumption is currently around 15
terawatts, which is far from the total potential energy
available from geothermal sources. While we can’t currently
use most reservoirs there is a hope that the number of
exploitable geothermal resources will increase with ongoing
research and development in the industry. It is currently
estimated that geothermal power plants could provide
between 0.0035 and 2 terawatts of power.
• SUSTAINABLE/ STABLE
Geothermal provides a reliable source of energy as
compared to other renewable resources such as
wind and solar power. This is because the resource
is always available to be tapped into, unlike with
wind or solar energy.
• HEATING AND COOLING
Effective use of geothermal for electricity generation requires
water temperatures of over 150°C to drive turbines. Alternatively,
the temperature difference between the surface and a ground
source can be used. Due to the ground being more resistant to
seasonal heat changes than the air, it can act as a heat sink/ source
with a geothermal heat pump just two metres below the surface.
•
Energy generated from this resource is easy to
RELIABLE
calculate since it does not fluctuate in the same
way as other energy sources, such as solar and
wind. This means we can predict the power
output from a geothermal plant with a high
degree of accuracy.
• NO FUEL REQUIRED
Since geothermal energy is a naturally
occurring resource there is no fuel required,
such as with fossil fuels that are a finite
resource which needs mining or otherwise
extracting from the earth.
• RAPID EVOLUTION
There is a great deal of exploration into geothermal energy at
the moment, meaning that new technologies are being
created to improve the energy process. There are an
increasing number of projects to improve and grow this area
of industry. With this rapid evolution many of the current
cons of geothermal energy will be mitigated against.
What are the Disadvantages of Geothermal
Energy?
• Location Restricted
• Environmental Side Effects
• Earthquakes
• High Costs
• Sustainability
Location Restricted
The largest single disadvantage of geothermal energy is that
it is location specific. Geothermal plants need to be built in
places where the energy is accessible, which means that some
areas are not able to exploit this resource. Of course, this is
not a problem if you live in a place where geothermal energy
is readily accessible, such as Iceland.
Environmental Side Effects
Although geothermal energy does not typically release
greenhouse gases, there are many of these gases stored under
the Earth’s surface which are released into the atmosphere
during digging. While these gases are also released into the
atmosphere naturally, the rate increases near geothermal
plants. However, these gas emissions are still far lower than
those associated with fossil fuels.
Earthquakes
Geothermal energy also runs the risk of triggering earthquakes.
This is due to alterations in the Earth’s structure as a result of
digging. This problem is more prevalent with enhanced
geothermal power plants, which force water into the Earth’s
crust to open up fissures to greater exploitation of the resource.
However, since most geothermal plants are away from
population centres, the implications of these earthquakes are
relatively minor.
High Costs
Geothermal energy is an expensive resource to tap
into, with price tags ranging from around $2-$7
million for a plant with a 1 megawatt capacity.
However, where the upfront costs are high, the
outlay can be recouped as part of a long-term
investment.
Sustainability
In order to maintain the sustainability of
geothermal energy fluid needs to be pumped
back into the underground reservoirs faster than
it is depleted. This means that geothermal energy
needs to be properly managed to maintain its
sustainability.
Geothermal Power Plants in the
Philippines
• Tongonan, Leyte
• Bago City, Negros Occidental
• Valencia, Negros Oriental
• Bacon, Sorsogon
• Tiwi Geothermal Power Plant in Tiwi, Albay
• Mak-Ban (Maikiling Banahaw) Geothermal Power Plant in
Calauan, Laguna
THANK YOU!
•Group 5 Lesson 8
•Kirsten Mae R. Lopez
•Daryl B. Galano
•Princess Celine Q. Saura
•Kriane Charles M. Tadeo