The source of geothermal energy is the hot rock thousands of
metres below ground level. This does not change with the
weather.
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The main engineering problems in getting energy from hot dry
rock are gathering the energy and energy conversion.
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By getting its energey
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Geothermal energy in a nutshell is heated steam, directed by
special pipes, that turn turbines. considering that below the
surface of the earth we will always have hot rock, and on the
surface water we can use then no, geothermal energy does not
'end'.
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Geothermal energy can be stored in batteries, like all other electrical energy. There is no reason why geothermal energy has to be stored, as it can be produced round the clock, unlike wind and solar.
A:The energy is stored in the form of dry steam which is water vapor with out water droplets, wet steam which is a mixture of water vapor and water droplets, and hot water trapped in fractured or porous rock.