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Reliable energy from the depths of our earth
Geothermal energy is an environmentally friendly and never-ending source of energy provided directly by the earth's interior. It is available practically everywhere and at any time. Whether it is visible as a hot spring on earth’s surface or in the depths of the earth, geothermal energy, in combination with other renewable energies, will gradually take over the heat and electricity supply from fossil fuels (coal, oil, gas) and nuclear power.
We distinguish between two geothermal processes: Near-surface geothermal energy with wells up to a depth of approx. 400 m and deep geothermal energy with wells from a depth of 400 to approximately 6,000 m.
Near-surface geothermal energy uses low earth temperatures up to approx. 25°C mainly for heating purposes for single houses and industrial plants; heat pumps are required to increase efficiency. Deep geothermal energy can take advantage of the higher temperatures directly via heat exchangers. With this process the heat is mainly supplied to district heating systems or electricity generating systems; technically sensible and economical electricity generation is only possible from temperatures above 100°C.