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Enhanced Geothermal Systems (EGS)


In a very basic set up, two deep wells are drilled up to 5 kilometres below the surface using land based drilling rigs – similar to those which are used for oil and gas production – and the deep underlying rock structures are fractured to enhance the flow off water between the wells.


Water is pumped down one well (the injection well) from ground level, then through very hot, fractured rocks, typically granite or sedimentary sandstones, and up the other well (the production well) to the surface of the Earth.


When the water gets to the surface it is very hot. It is moved through a turbine which converts the water to electricity.