‘The project proposes to install a plant in the North Sea, where conditions are similar to those found in Finland but extend over an area of about 65,000 square kilometres. There are geological fissures and igneous rocks there that could generate energy for 20 million years by extracting just 0.1% of the existing heat, with cheaper facilities and a stable supply.’

https://www.ecoticias.com/en/geothermal-energy-mine-discovered/5412/