Geothermal energy as a CO(2) free and domestic energy resource will have a prominent position in the future energy mix due to its high availability. The three most promising regions in Germany (Upper Rhine Valley, Bavarian Molasse Basin, North German Basin) represent already an overall power production potential of 33,3 . 10(4) TWh. There are four German geothermal power plants in operation in recent days. The previous development shows that the current cost of power generation can be further reduced, e. g., by additional research or economy of scale. Due to with the Renewable Energy Sources Act, the commercial use of geothermal energy for power production is feasible even for low enthalpy resources like in Germany.