With almost every part of the world capable of making use of geothermal energy, there must be many problems with its use. First of these is that the water that returns to the surface contains dissolved minerals. If pumped straight into the turbines they "fur up", just like a kettle, and corrode. Another problem is that water gets lost - tests have shown that only a third comes back to the surface. Lastly, drilling the very deep holes (often several kilometres) is not easy, particularly through many types of rock.
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