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The following is a description of the broad principles involved in generating electricity from hot dry rocks. For a more detailed description of the differing types of system, please see the related link.

To generate electricity from"hot dry" rocks a "ground loop" must be installed. This is essentially a borehole containing a tube through which water can flow down to the point within the Earth where the "hot rocks" are located and then back up to the surface.

The water is passed down the borehole where it is heated by the geothermal energy (or heat) contained within the rocks at depth. Assuming that the temperature is high enough this will result in the water boiling to form steam. This returns up to the surface and can be used to drive a turbine which in turn drives an electrical generator. The steam is then allowed to condense back into water which is passed back down the borehole allowing the cycle to continue.

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Q: How is hot and dry rock used to generate electricity?
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