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- The temperature of the Earth's crust increases with depth. Because of this
- geothermal gradient heat flows outwards from the hot interior. This heat
- flow is augmented by heat generated in crystalline rocks as a result of the
- spontaneous decay of long-lived radioactive isotopes of uranium, thorium
- and potassium. Cornwall is an ideal place for HDR geothermal energy
- production. Its granite rocks contain significant proportions of natural
- radioactive elements which enhance the heat flow to twice the UK average.
- The rocks also contain a fracture system which is amenable to stimulation
- techniques needed to increase their permeability.
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- Many scientific and technical problems associated with HDR have been solved
- during the present phase of research on the 2-3 kilometre deep experimental
- system at the Rosemanowes site. However, the difficulties of creating a
- workable HDR reservoir at depths of 6 kilometres or more are formidable and
- will require tremendous feats of science and engineering.
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