2. ALTERNATIVE SOURCES OF ENERGY
• Wind Energy
• Geothermal Energy
• Hydro-electricity
• Biofuel
• Solar Energy

3. WIND ENERGY
Flowing wind can be used to turn
turbines for the generation of
electricity.
A typical wind tower consists 2 to 3
blades which turn a shaft increasing
rotation speed and converting into
electrical energy.

4. …WIND ENERGY
Vertical axis and horizontal axis are
two different kinds of wind
generators.
The wind generation tower has
various heights.

5. …WIND ENERGY
The potential energy of wind is
converted into kinetic energy as
electricity.
China, USA and Germany are top
three wind power generators of
the world.

6. HYDROELECTRICITY
Hydroelectricity has been generated
from flowing water for many years.
Electricity is generated from storing
water in a reservoir and releasing it to
turbines, run-off River and pumping
water at height and releasing it to turn
the turbine.

7. …HYDROELECTRICITY
Around 20% of the world’s
electricity is generated from
hydropower.

8. BIO FUEL
Biofuel, alternative source of
energy, has been used to
replace conventional fuels.
Biofuels are renewable sources
of energy produced from
biological materials such as
sugarcane, corn, cellulose or
vegetable oils.

9. …BIO FUEL
Ethanol and biodiesel are common
biofuels.
Ethanol can be used as a direct
source of energy and combined
with gasoline to produce effective
results.

10. …BIO FUEL
Biodiesel is a biodegradable fuel
which can replace traditional
diesel fuel.
Technology has been developed to
use algae as a biofuel.

11. GEOTHERMAL ENERGY
Heat of the earth can be a source of
electricity known as geothermal
energy.
Geothermal reservoir made up of
hot water heated by magma deep
inside the earth, is a source of
electricity.

12. …GEOTHERMAL ENERGY
Steam rising from the hot water is
used to turn the turbine producing
electricity.
More than 20 countries of the world
are producing geothermal energy
and US is the largest producer.

13. …GEOTHERMAL ENERGY
Iceland has highest potential of
geothermal energy and 26% of
the electricity is produced from
geothermal energy in the
country.

14. SOLAR ENERGY
Electricity produced from solar
energy is alternative to finite
sources of energy such as coal
and oil.
Solar power installation at home or
small offices has been
increasing in the past decades.

15. …SOLAR ENERGY
Micro scale solar power
generation is effective to
reduce fossil fuel
dependence, minimize
environmental pollution and
meet increasing energy
demand.

16. …SOLAR ENERGY
Household energy production has
advantages of reducing energy
losses during the transmission
from central power station.
Silicon is used as a semiconductor
material in the solar cells.

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