New Maps Unlock Deep Geothermal Potential Across Lower Saxony
A new map series has been released to help expand geothermal energy use in Lower Saxony. The Lower Saxony Geothermal Service (NGD), part of the State Office for Mining, Energy, and Geology (LBEG), published the resource to support the region’s energy transition. The maps focus on ancient rock layers that could unlock deep geothermal potential across the area. The maps highlight the Keuper-era Exter Formation, where rock layers over 200 million years old lie at depths of up to 2,600 metres. These formations contain water-permeable sandstones with temperatures exceeding 100 degrees Celsius—ideal conditions for geothermal extraction. Deep geothermal systems, defined by boreholes deeper than 400 metres, typically operate between 2,000 and 3,500 metres underground.
Geothermal energy works by extracting thermal water from sandstone layers through boreholes. Heat is then captured at the surface using exchangers, providing a renewable energy source. North Germany holds significant untapped potential, though high drilling costs and exploration risks have slowed development. The new series aims to simplify site selection for municipalities, planners, and businesses. With demand rising among local utilities and energy-intensive industries, the maps are now available online for public access.
The publication comes as Lower Saxony pushes to make deep geothermal energy a key part of its energy transition. The maps provide a practical tool for identifying viable sites, reducing uncertainty in project planning. Authorities hope this will encourage wider adoption of geothermal solutions in the region.
