Renewable resources have three main characteristics: utility, limited availability, and potential for depletion or consumption over time. They include energy sources like solar, wind, tides, geothermal and biomass. Fossil fuels like coal, natural gas and minerals are non-renewable resources. Renewable resources can replenish naturally, unlike fossil fuels. The document then discusses various renewable energy sources in detail, including solar energy harnessed via solar thermal and photovoltaic methods, wind energy via wind turbines, bio energy from waste, hydro energy from falling water, and tidal energy from tidal barrages.

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2. • A source or supply from which benefit is
produced.
3 main characteristics:
Utility
Limited availability
Potential for depletion or
consumption.
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4. • A natural resource.
• Ability to reproduce through
biological or natural processes
and replenished with the
passage of time.
• Are part of our natural
environment and form our eco-
system .
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5. • Solar energy
• Tides
• Winds
• Geothermal
• Biomass and
• Other natural elements.
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6. • Gasoline,
• Coal
• natural gas,
• diesel and
• other commodities derived
from fossil fuels.
• minerals like copper and
others without a sustainable
yield. Page 6

7. Renewable resources
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8. Solar energy
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9. • Energy derived from the sun in the
form of solar radiation.
• It is the most readily available and
free source of energy since prehistoric
times.
• India receives solar energy in the
region of 5 to 7 kWh/m2 for 300 to
330 days in a year.
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10. • This energy is sufficient to set up 20
MW solar power plant per square
kilometer land area.
• Solar thermal route uses the sun's
heat to produce hot water or
air, cook food, drying materials etc.
• Solar photovoltaic uses sun’s heat
to produce electricity for lighting
home and building, running
motors, pumps, electric
appliances, and lighting.
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11. Solar Flat plate collector
Box type solar cookers:
Photovoltaic Domestic

12. Wind Energy
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13. Wind Energy
• Harnessing of wind power to produce
electricity.
• The kinetic energy of the wind is converted
to electrical energy.
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14. • When solar radiation enters the
earth’s atmosphere, different
regions of the atmosphere are
heated to different degrees because
of earth curvature.
• This heating is higher at the equator
and lowest at the poles.
• Since air tends to flow from warmer
to cooler regions, this causes winds,
and it is these airflows that are
harnessed in windmills and wind
turbines to produce power
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16. Bio Energy
• A renewable energy resource
derived from the carbonaceous
waste of various human and
natural activities.
• Derived from numerous
sources, including the by-products
from the wood
industry, agricultural crops, raw
material from the
forest, household wastes etc.
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17. • Does not add carbon dioxide to
the atmosphere as it absorbs the
same amount of carbon in
growing as it releases when
consumed as a fuel.
• Advantage is used to generate
electricity with the same
equipment that is now being
used for burning fossil fuels.
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18. Biogas
• Bio-energy, in the form of biogas, which is
derived from biomass,
• Is expected to become one of the key
energy resources for global sustainable
development.
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19. Hydro Energy
• The potential energy of falling
water, captured and converted
to mechanical energy by
waterwheels.
• Water under pressure flows
through a turbine causing it to
spin. The Turbine is connected
to a generator, which produces
electricity
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20. Hydro Power Plant
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21. Tidal Energy
• Tidal electricity generation
involves the construction of a
barrage across an estuary to
block the incoming and outgoing
tide.
• The head of water is then used
to drive turbines to generate
electricity from the elevated water
in the basin as in hydroelectric
dams.
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23. Let’s contribute for a Greener Planet…
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