Chapter 12

Geothermal Power


Geothermal energy is the heat energy contained within Earth’s body. This heat sometimes creates underground reservoirs of hot water. Drilling into these will release high-pressure steam and water that can be used in a steam turbine to produce electric power. Such reservoirs are normally found along tectonic plate boundaries. Elsewhere there are regions of hot rock close to Earth’s surface that can be exploited by drilling and then pumping high-pressure water into the rock where is heated and then extracted. The temperature of water in geothermal reservoirs is relatively low and the efficiency of energy extraction is low too. Energy extraction is usually by steam turbine. This can be driven directly if the ...

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