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What is geothermal energy ?

Geothermal energy- energy that comes

from the ground; power extracted fromheat stored in the earth

Geo: earth

Thermal: heat

http://geothermal.marin.org/video/vid_pt1.htmlhttp://geothermal.marin.org/video/vid_pt1.html

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Direct

Small scale uses

Greenhouseheating

Food dehydrationplants

Agriculture Crop drying

Milk pasteurization

Electrical

Dry steam

Flash steam

Binary cycle

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Earths core heat

Water steam drive electrical

generators Turbines

Area specific

Geothermal energy is localized

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1926: a deep geothermal well was usedto heat greenhouses.

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1960: Pacific Gas and Electric has firstsuccessful geothermal electric powerplant in US at The Geysers

Turbine lasted more than 30 years

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a hole is drilled

steam and water travel up this liner

master valve at the top - to control the flow andthen a pipeline carries the water and the steam

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water to a re-injection well

The steam is sent to the powerstation

Turbine - turbine blades - produces the electricity

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It is renewable

It doesnt cause pollution

Owners of buildings using geothermal have cut 25 to 50 percent off their

utility bills.

No cooling towers, rooftop units, or individual room air conditioning units

are needed, so buildings and schools using geothermal systems look

better.

Theres no fire hazard and no outside equipment that could potentiallyhurt kids

Geothermal systems are quieter, more reliable, more efficient, and more

compact compared to regular heating and cooling systems.

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100% renewable

Earths core is always going to be heated As long as there is a way to extract the energy

from the heat, the energy will always beavailable

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Not produce any pollution & does not contribute to the

greenhouse effect.

The power stations do not take up much room, sothere is not much impact on the environment.

No fuel is needed.

Once built a geothermal power station, the energy is

almost free.It may need a little energy to run a pump, but this canbe taken from the energy being generated.

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Not many places where you can build a geothermalpower station - need hot rocks of a suitable type, at a

depth where we can drill down to them.The type of rock above is also important, it must be ofa type that we can easily drill through.

Sometimes a geothermal site may "run out of steam",

perhaps for decades. Hazardous gases and minerals may come up from

underground, and can be difficult to safely dispose of.

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Not everyone agrees that geothermal energyis a solution to our energy crisis

Too costly

Noise

Use of fresh water

Land surveying

The technology is not quite there Some people just believe that our fossil fuels

will never run out Dont believe that fossil fuels are finite

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Overall, geothermal appears to be asound solution to energy needs

Geothermal energy has the ability toexpand

Few environmental effects

Very cost efficient Geothermal is RENEWABLE