Renewable Energy Sources

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WIND POWER

How it works:

  • each turbine has its own generator
  • genertor is used when the wind blows which turns the blades
  • the generator is used to make electricity

Advantages:

  • no pollution
  • no permanant damage
  • no fuel costs

Disadvantages:

  • very noisy
  • spoil the view
  • the inital costs are high
  • some pollution
  • large number needed
  • no power when wind stops
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SOLAR CELLS

How it works:

  • generates electricty from the suns light
  • panels are used

Advantages:

  • no pollution
  • in hot countries solar power is a very reliable source
  • energy is free
  • running costs are almost nil
  • great in remote places
  • good for a small scale

Disadvantages:

  • inital costs are high
  • not practical to connect to the national grid
  • too expensive
  • only works in the daytime
  • some pollution
  • does not work at night
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HYDROELECTRIC POWER

How it works:

  • use a flooding of a valley with a big dam
  • rainwater is caught and allowed through turbines
  • turbine is connected to a generator which produces electricity

Advantages:

  • no pollution
  • no problem with reliability
  • great for remote small scale areas
  • provide an immediant response

Disadvantages:

  • inital costs are high
  • big imapact on enviroment
  • loss of habitat
  • doesnt work in droughts(looks ugly when dried up)
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PUMPED STORAGE

How it works:

  • surplus electricity generated during night
  • used to pump water from top reservoir to bottom reservoir
  • water available to use to generate electricity at peak time

Advantages:

  • pumped storage is one of the best soloutions
  • store spare energy
  • SAME AS HYDROELECTRIC

Disadvantages:

  • effects the enviroment
  • SAME AS HYDROELECTRIC
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WAVE POWER

How it works:

  • waves come in on shore
  • up-down motion
  • turns the turbines
  • used to drive generator

Advantages:

  • no pollution
  • no fuel costs
  • very useful on small islands

Disadvantages:

  • inital costs are high
  • hazard to boats
  • fairly unreliable(wave die out/wind syops)
  • spoils the view
  • you need lots of small wave-powered turbines
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TIDAL BARRAGES

How it works:

  • (source of gravity& sun/moon)
  • big dam built across river estuaries(with turbines)
  • waves come in and fills up the esturary
  • water allowed through turbines which produces electricity

Advantages:

  • pretty reliable
  • excellent for storing energy and can store for peak demand
  • no fuel costs & minimal running costs
  • no pollution

Disadvantages:

  • prevents access to boats & alters the habitat for wildlife
  • height of tide changes
  • costs are high
  • not all esturaries can be used
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GEOTHERMAL ENERGY

How it works:

  • used in volcanic areas where hot rocks are used
  • steam and hot water rise to the surface which is used to drive a generator
  • source of heat is the slow decay of various elements e.g. uranium

Advantages:

  • brilliant free energy
  • no envirmental problems
  • used to heat buildings directly without being converted to electrical energy

Disadvantages:

  • aren't many suitable locations
  • cost of building of a power plant is often high compared to the amount of energy we use.
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BIOFUELS

How it works:

  • they're burnt to heat water
  • biofuels are burnt(e.g. solids:straw,nutshells and wood ships or liquids: ethanol or gases:methane, 'biogas from sludge digesters' or dead oragnisms)
  • which then turns a turbine which the turns a generator

Advantages:

  • it uses carbon neutral
  • quick and 'natural' source of energy
  • renewable and won't run out

Disadvantages:

  • large forests have to be cleared to make room to grow biofuels
  • lots of species lose their natural habitats
  • the decay and burning of the vegetation increases Co2 and methane
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