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“In a geothermal context, there are only a few places in the world where people have drilled deep into the type of rock we have in Norway. They’ve only done it in Germany, Australia and France. Geothermal energy is normally extracted in areas close to the edges of tectonic plates, such as in Iceland. There’s a lot of volcanic activity there, something that means a lot of geothermal heat. While in Norway we have what is called cold crust. If you assume a temperature increase of 5–10 degrees per kilometre, you need to drill down 10 kilometres before you reach 100 degrees here. The deepest borehole on Earth is 12 kilometres deep, and so far that is not economically viable,” says Bastesen.
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