Lower Saxony uncovers vast deep geothermal potential beneath northern Germany

Deep geothermal energy is gaining momentum in Lower Saxony as a key part of the region’s energy transition. New maps have now identified promising areas for extraction, revealing untapped potential beneath northern Germany. The findings come as demand for this renewable heat source grows among local authorities and industries. The Lower Saxony Geothermal Service (NGD) has released a detailed map series pinpointing suitable locations for deep geothermal projects. These maps draw on data from over 1,100 deep boreholes, most originally drilled for oil and gas exploration. The focus lies on ancient rock layers—over 200 million years old—belonging to the Keuper-era Exter Formation.

The targeted sandstone layers sit at depths up to 2,600 meters, where temperatures exceed 100 degrees Celsius. These water-permeable rocks provide ideal conditions for extracting thermal water through boreholes. Once brought to the surface, the heat can supply district heating networks or large industrial consumers. Carsten Mühlenmeier, president of the State Office for Mining, Energy and Geology (LBEG), noted that better geological data allows for more precise site selection. This reduces exploration risks and could lower the high drilling costs that have previously limited development. Despite the potential, deep geothermal energy remains underused in northern Germany, where most existing systems operate at depths between 2,000 and 3,500 meters.

The new maps provide a clearer picture of where geothermal energy can be viably extracted in Lower Saxony. With rising interest from municipalities and energy-intensive businesses, the technology is poised to play a larger role in the region’s shift away from fossil fuels. The next step will depend on investment and further exploration to turn these findings into operational projects.