Transcript Document 7648370

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.
-+-+-+-+-+-+-+-+-+• 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
Largest hydro-electric power
stations
• In progress:::: Ilısu 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 (6×700MW)
• 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
Ilısu Dam
• Hydroelectric plant in Costa Rica.
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
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].
-+-+-+-+-+-+-+-+-+-+-+-+• Geothermal borehole outside Reykjavik
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.
• 
I think they are very difficult.
Which one do yo prefer?
It is prepared by
Raziye Altınsoy
AKSARAY HİGH SCHOOL