Renewable Energy Sources

Detailed Document regarding renewable energy resources and their advantages and disadvantages as well as a explanation about them

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Renewable Energy Sources
Wind-Power
How it works:
The Sun heats our atmosphere unevenly, so some patches become warmer than
others.
These warm patches of air rise, other air blows in to replace them - and we feel a
wind blowing.
We can use the energy in the wind by building a tall tower, with a large propellor on
the top.
The wind blows the propellor round, which turns a generator to produce
electricity.
Advantages:
Wind is free, wind farms need no fuel.
Produces no waste or greenhouse gases.
The land beneath can usually still be used for farming.
Wind farms can be tourist attractions.
A good method of supplying energy to remote areas.
Disadvantages:
The wind is not always predictable - some days have no wind.
Suitable areas for wind farms are often near the coast, where land is
expensive.
Some people feel that covering the landscape with these towers is
unsightly.
Can kill birds - migrating flocks tend to like strong winds.
However, this is rare, and we tend not to build wind farms on migratory
routes anyway.
Can affect television reception if you live nearby.
Can be noisy. Wind generators have a reputation for making a constant,
low, "swooshing" noise day and night, which can drive you nuts.
Having said that, as aerodynamic designs have improved modern wind
farms are much quieter. A lot quieter than, say, a fossil fuel power station;
and wind farms tend not to be close to residential areas anyway. The small
modern wind generators used on boats and caravans make hardly any
sound at all.
Wave Power
How it works:
Wave power involves the ability to harness the power of the ocean's waves and
use that power to generate electricity
Advantages:
The energy is free - no fuel needed, no waste produced.
Not expensive to operate and maintain.
Can produce a great deal of energy.
Disadvantages:
Depends on the waves - sometimes you'll get loads of energy, sometimes
almost nothing.

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Needs a suitable site, where waves are consistently strong.
Some designs are noisy. But then again, so are waves, so any noise is
unlikely to be a problem.
Must be able to withstand very rough weather.
Hydrolectric power
How it works:
A dam is built to trap water, usually in a valley where there is an existing lake.
Water is allowed to flow through tunnels in the dam, to turn turbines and thus
drive generators.…read more

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Also, if you're one of the 80,000+ birds that feeds on the exposed mud flats when
the tide goes out, then you have a problem, because the tide won't be going out
properly any more.
Advantages:
Once you've built it, tidal power is free.
It produces no greenhouse gases or other waste.
It needs no fuel.
It produces electricity reliably.
Not expensive to maintain.
Tides are totally predictable.…read more

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How it works:
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.
Advantages:
Geothermal energy does not produce any pollution, and does not
contribute to the greenhouse effect.…read more

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