Hot dry rock geothermal energy (HDR) is a type of
geothermal power production that utilises the very high temperatures that can be found in rocks just a few kilometres below ground. This is done by pumping high pressure water down a
borehole into the heat zone. The water travels through fractures in the rock, capturing the heat of the rock until it is forced out of a second borehole as very hot water, which is converted into electricity using either a
steam turbine or a
binary power plant system. All of the water, now cooled off, is injected back into the ground to heat up again.
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