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Successful Completion of Geothermal Drilling in Prenzlau: A Major Step Toward Sustainable District Heating!

Successful Completion of Geothermal Drilling in Prenzlau , The Future of Heating Lies Deep Underground

January 29, 2026 – A milestone for the energy transition in northern Brandenburg!

The Stadtwerke Prenzlau can celebrate a big win: The demanding drilling operations for their ambitious geothermal project have been successfully completed. After 54 days of continuous 24/7 work shielded behind tall noise barriers,the team reached target depth and tapped into a promising sandstone layer at around 1,000 meters.

Test results are now in and largely match (or even slightly exceed) the original expectations,with one small trade-off:

- Thermal water temperature: 42.6 °C (original expectation: ~44 °C – a minor shortfall)  
- Production rate: 136 m³/hour (original plan: 130 m³/h – pleasantly higher than anticipated!)  

This translates to roughly 38 liters per second of warm brine available for heat supply,enough to form a solid, reliable foundation for decarbonizing district heating in Prenzlau, the district town in the Uckermark region of northeastern Germany.

Harald Jahnke, Managing Director of Stadtwerke Prenzlau, expressed satisfaction during a recent press briefing:  
“The drilling campaign proceeded exactly according to schedule and without any major surprises. We now have the geological certainty we need to move forward confidently.”

A Glimpse into Earth's Ancient Past

The cores and water samples don't just deliver engineering data,they open a window into deep time. Geological evidence shows that more than 200 million years ago, during the Triassic period, a shallow sea and beach existed right beneath what is now Prenzlau. The very reservoir now being tapped is a remnant of that ancient marine environment. Stories like this remind us how geothermal energy is intimately linked to our planet's 4.5-billion-year history.

What's Next on the Roadmap?

The project now shifts gears into surface infrastructure and network expansion:

- Tendering and construction of the above-ground facilities (heat pumps, production pumps, pipelines for the thermal brine loop)  
- Step-by-step extension of the district heating grid to reach additional residential areas  
- Planned commissioning of the new geothermal heat supply: heating season 2027/28

Construction of the geothermal heating plant itself is expected to begin in the second half of 2026, paving the way for a significant share of Prenzlau's heat to come from this renewable, baseload source in the years ahead.

Why Prenzlau Matters for the Broader Geothermal Scene

Projects like this demonstrate that deep geothermal has strong potential even outside Germany's classic “southern Molasse Basin” hotspots. In the North German Basin, moderate-temperature resources combined with large-scale district heating networks can deliver outsized climate impact. Supported by federal funding programs (including KfW's deep geothermal initiative with exploration risk coverage and substantial loans), and accelerated by Germany's Geothermal Acceleration Act, more such developments are on the horizon.

Prenzlau is showing how local utilities, with solid planning and community backing, can drive the heat transition forward,reducing reliance on imported fossil fuels and delivering stable, low-carbon warmth for decades.

Stay tuned  Alphaxioms Geothermal News will keep you updated!  
We'll follow progress in Prenzlau through the 2026 construction phase, surface plant build-out, and similar initiatives across Brandenburg and beyond.


What do you think about Prenzlau's approach? Is deep geothermal the underrated powerhouse of the heat transition in northern Europe? Drop your thoughts in the comments!


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