Hydroelectricity

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Hydroelectricity

• Hydroelectricity is electricity obtained from
  hydropower. Most hydroelectric power comes from
  the potential energy of dammed water driving a
  water turbine and generator, although less common
  variations use water's kinetic energy or dammed
  sources, such as tidal power. Hydroelectricity is
  a renewable energy source.
• The energy extracted from water depends not only
  on the volume but on the difference in height
  between the source and the water's outflow. This
  height difference is called the head. The amount
  of potential energy in water is proportional to
  the head. To obtain very high head, water for a
  hydraulic turbine may be run through a large pipe
  called a penstock.

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• While many supply public electricity networks,
  some hydroelectric projects were created for
  private commercial purposes. For example,
  aluminium processing requires substantial amounts
  of electricity, and often dedicated hydroelectric
  projects are built to serve aluminium
  electrolytic plants. In the Scottish Highlands
  there are examples at Kinlochleven and Lochaber,
  constructed during the early years of the 20th
  century. In Suriname, the 'van Blommestein' lake,
  dam and power station were constructed to provide
  electricity for the Alcoa aluminum industry

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Largest hydro-electric power stations

• In progress Ilisu Dam, one of the
  Southeastern Anatolia Project Dams in Turkey,
  Construction started on August 5, 2006.
• Three Gorges Dam, China. First power in July
  2003, with 9,800MW installed until 2006,
  scheduled completion 2009, total power 22,400 MW
  including the Underground Power Station (6700MW)
  
• Xiangjiaba Dam,China.Construction started in
  November 26 2006, scheduled completion 2015,
  6,000 MW
• Xiluodu Dam, China. Construction started in
  December 26 2005, scheduled completion 2015,
  12,600 MW

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Ilisu Dam
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• Hydroelectric plant in Costa Rica.

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Geothermal Pover

• Geothermal power is the use of geothermal heat to
  generate electricity. It is often referred to as
  a form of renewable energy, but because the heat
  at any location can eventually be depleted it is
  by definition not strictly renewable. Geothermal
  comes from the Greek words geo, meaning earth,
  and therme, meaning heat. Geothermal literally
  means "earth heat". Geothermal-generated
  electricity was first produced at Larderello,
  Italy, in 1904.

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• Undershot water wheels on the Orontes River in
  Hama, Syria
• Saint Anthony Falls

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Capacity

• By the end of 2005 worldwide use of geothermal
  energy for electricity had reached 9.3 GWs, with
  an additional 28 GW used directly for heating
  1. If heat recovered by ground source heat
  pumps is included, the non-electric use of
  geothermal energy is estimated at more than 100
  GWt (gigawatts of thermal power) and is used
  commercially in over 70 countries 2.
• During 2005 contracts were placed for an
  additional 0.5 GW of capacity in the United
  States, while there were also plants under
  construction in 11 other countries 3.

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• Geothermal borehole outside Reykjavik

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WE KNOW.

• Oil , coal and gas are very harmful for
  tha world.
• But we hope in the future hydroelectric
  and geothermal power instead of them.
• ? ? ? ? ? ? ? ? ?

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I think they are very difficult.Which one
do yo prefer?
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It is prepared byRaziye AltinsoyAKSARAY
HIGH SCHOOL