Finland is attempting to heat many of their communities with geothermal wells.
The first well in the Otaniemi project has now been drilled to the final depth of 6.4 km on Saturday evening and we have shown the world that deep wells can be drilled into Scandinavian granite in cooperation with St1 and partners. Our goal is to build industrial scale heat plant running on geothermal energy.
To date, three deeper wells have been drilled for research use; in Russia 12.3 km, in Germany 9.1 km and in Sweden 6.96 km. Our well is the deepest well ever drilled for energy production, a world record in its kind.
https://geothermalresourcescouncil.blogspot.ca/2018/04/finland-geothermal.html
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