Deutsche Erdwärme Launches Long-Term Geothermal Productivity Test in Graben-Neudorf

Deutsche Erdwärme Starts Long-Term Geothermal Test in Graben-Neudorf

After months of inactivity, the geothermal project in Graben-Neudorf (Karlsruhe district) is springing back to life. Deutsche Erdwärme has initiated a long-term test to evaluate the productivity of its 3,600-meter-deep borehole. The test, expected to run for two to three weeks, is seen as a critical step in determining the feasibility of large-scale geothermal energy production at the site.

The central question: Is the geothermal well as productive as Deutsche Erdwärme anticipates? According to reports by SWR, water will be pumped into the underground reservoir, followed by seismological measurements and pressure tests. These activities aim to determine the operational conditions required for safely running a future geothermal plant.

Herbert Pohl, CEO of Deutsche Erdwärme, noted that such a long-term test is unprecedented in Germany and in the Upper Rhine Valley. While geothermal exploration in Graben-Neudorf has been ongoing for decades, this advanced stage of the project focuses on securing sustainable heat extraction and simulating plant operations. Systematic geothermal studies at the site date back more than 30 years.

During the test, significant amounts of water will be injected into the hot underground reservoir. Pressure will be applied carefully to avoid triggering significant seismic events, preventing incidents similar to those experienced in Basel or Landau.

A key goal of this long-term test is to ensure a reliable supply of heat for a regional district heating network. At a minimum, the communities of Graben-Neudorf and the city of Bruchsal are expected to benefit. Deutsche Erdwärme is also in discussions with additional municipal utilities. Further drilling is planned nearby in Dettenheim, although regulatory conditions are still being finalized.

If everything goes according to plan, a second borehole will follow next year in Graben-Neudorf—essential for the eventual operation of the geothermal plant. However, exact dates are not yet confirmed. Only a few specialized drilling rigs in Europe are capable of reaching these depths, so work will resume once equipment becomes available.

With temperatures exceeding 200°C at around 3,600 meters deep, Graben-Neudorf is considered Germany’s hottest thermal water source. Extracting this extremely hot water requires specialized heat-resistant technology, which was not part of the original design. Deutsche Erdwärme aims to begin routine extraction of hot thermal water by 2029. Meanwhile, a geothermal power plant will be constructed on-site to process the heat efficiently.

Deutsche Erdwärme’s long-term test marks a significant milestone in Germany’s geothermal energy sector. Success in Graben-Neudorf could not only provide clean, sustainable heat to local communities but also set a benchmark for geothermal projects across the Upper Rhine Valley.

Source: SWR

Connect with us: LinkedIn, X

Comments

Exergy Gemini Turbine vs Ormat Ormega100: Geothermal Binary Power Comparison

Exergy Gemini Turbine vs Ormat Ormega100: Two Different Paths to Geothermal Scale image : a thematic view of a geothermal turbine "blade" Geothermal power is entering a new phase. Two of the most important announcements in the sector point to larger, more standardized, and more commercially viable binary geothermal systems: Exergy’s Gemini Turbine and Ormat’s Ormega100 . At first glance, both machines promise major gains in scale, but they are not trying to solve the same problem in exactly the same way. Gemini is built around a high-capacity radial outflow turbine architecture that can deliver up to 60 MWe per shaft, while Ormega100 is designed as a 100 MW binary surface power unit intended to accelerate enhanced geothermal system commercialization. For project developers, utilities, and data-center buyers looking for firm clean power, the comparison matters because it reveals two competing ideas about how geothermal should grow. Exergy is emphasizing turbine architectur...

GA Drilling: Advanced Geothermal Drilling Technology, Deep Rock Innovation, and Clean Energy Financing

GA Drilling : Deep Drilling Technology, Financing, and Geothermal Scale-Up Image: A GA Drilling Bit GA Drilling is one of the more important technology companies in the geothermal sector because it is trying to solve a problem that has limited geothermal growth for decades: the cost, complexity, and risk of drilling deep wells in hard rock. Rather than operating a geothermal power plant itself, the company focuses on the drilling side of the value chain, developing technologies that can make deep geothermal wells faster, cheaper, and more reliable to build. That positioning gives it a different role from most geothermal developers, and it also makes it strategically significant for the future of clean baseload energy. The geothermal industry has always been constrained by subsurface uncertainty. Developers know where the heat is in a general sense, but they still must drill through high-temperature, abrasive, fractured, and often unpredictable rock to get there. In many projects, dril...

EGS Market Size and Investment Outlook

Enhanced Geothermal Systems (EGS) Market Size and Investment Outlook to 2034 Enhanced Geothermal Systems are at an inflection point. For years, EGS sat in the “promising but pre‑commercial” category of clean technologies, constrained by drilling cost, subsurface risk, and limited policy attention. That picture is now changing as next‑generation geothermal developers raise larger rounds, sign serious offtake agreements, and move projects from concept to execution. At the same time, global demand for firm, low‑carbon power is rising faster than conventional geothermal can supply. Thermal plants are retiring, grids need 24/7 clean electricity, and policymakers are discovering that weather‑dependent renewables cannot carry the entire load alone. EGS is emerging as one of the few technologies capable of delivering baseload clean power using a resource available almost everywhere: deep, hot rock. Current EGS Market Size – Small but Strategic In absolute terms, the EGS market is s...

EU Tripartite Energy Storage Agreement, EGEC and QHeat Drive 30–35 GW Storage Deployment, Geothermal Energy Storage, Flexible Renewable Integration, and Clean Energy Investment Opportunities

The new EU tripartite agreement on energy storage, with EGEC and QHeat among the signatories, gives you a strong “systems-level” angle to layer onto your California geothermal piece by showing how firm clean power and storage are being coordinated on both sides of the Atlantic. Image : UK First Geothermal power plant at United Dawn's by Enel Green Coordinated Clean Firm Power, How California’s Geothermal Push and Europe’s Energy Storage Tripartite Are Rewriting the Rules of the Grid California’s decision to fund geothermal exploratory wells and the EU’s first‑ever tripartite agreement on energy storage are two sides of the same strategic coin, both designed to deliver secure, flexible, and affordable clean electricity. While California is targeting next‑generation geothermal to close its “clean firm gap,” Brussels is rallying 22 Member States, industry, banks, and innovators around a shared pledge to add 30–35 GW of new storage capacity in just two years.Together, these moves sh...

Tarragona Geothermal Energy Project: Renewable Heating Potential in Six Municipalities

Hidden geothermal energy under six Tarragona municipalities could power a new phase of the energy transition Image : A Geothermal Power Plant gushing steam to power a grid A renewable resource beneath the ground A new study in Tarragona has revealed that geothermal energy could become a major local source of heat and cooling for six municipalities: Ascó, Mont-roig del Camp, Montbrió del Camp, Flix, Ulldemolins, and El Perelló . The research suggests that shallow geothermal systems could supply hundreds of buildings and public facilities with a steady, renewable, and locally available energy source . The idea is compelling because it combines climate action with territorial resilience. Instead of depending entirely on imported energy or weather-dependent renewables, these towns could tap into the stable temperature of the subsoil to produce heating, cooling, and domestic hot water . For a region that is already managing the transition away from nuclear dependence, this could ...

Geothermal Engineering Limited (GEL): Deep Geothermal Technology, Financing, and UK Clean Energy Expansion

Geothermal Engineering Limited (GEL) : Technology, Financing, and Progress Image : Ryan Law is the C.E.O at GEL Geothermal Engineering Limited (GEL) is one of the UK’s most important geothermal developers, with a flagship deep-geothermal project at United Downs in Cornwall and a growing strategy that combines electricity, heat, and lithium extraction. It has also attracted a mix of private capital, public grants, and bank financing to move from exploration and drilling into commercial operations. Company overview GEL was incorporated in 2008 and is registered in Cornwall as a private limited company focused on electricity production, utility construction, and test drilling and boring. Its core mission is to use geothermal resources beneath the ground to support low-carbon power, heating, cooling, and ultra-low-carbon lithium production in the UK. The company presents itself as a lean specialist team built around geothermal engineering, geology, and community engagement capabilities. ...

California Invests in Geothermal Exploratory Wells, Unlocking Next‑Generation Geothermal Growth, Clean Firm Power, and Investment Opportunities in California Geothermal Funding

California’s Big Bet on Next,Generation Geothermal, Why New State Funding Could Unlock Clean, Firm Power California just took an important step toward scaling next,generation geothermal energy. In the 2026 budget, Governor Gavin Newsom and the state legislature included targeted funds for geothermal exploratory wells and early,stage in,field programs, a move Clean Air Task Force (CATF) says is essential to overcoming the subsurface uncertainty that has slowed project deployment. This funding mirrors recommendations from CATF’s recent report, “Build Here: How Targeted State Investment in Geothermal Can Fill California’s Clean Firm Gap,” and could accelerate geothermal’s role as a reliable complement to wind, solar, and storage. Below I unpack why the new funding matters, how it addresses the industry’s biggest barriers, what the potential economic and grid benefits are, and where private capital, developers, and policymakers should focus next to turn this promise into projects. What Ca...

Réseau Terra Confort Geothermal Energy Project: Châtenay-Malabry and Le Plessis-Robinson’s 88% Renewable District Heating Network

Réseau Terra Confort: Châtenay-Malabry and Le Plessis-Robinson Commission a Landmark Geothermal Heating Network Today’s commissioning of Réseau Terra Confort marks a major step in the energy transition of the Hauts-de-Seine area. Designed to supply the Ville de Châtenay-Malabry and the Ville du Plessis-Robinson, the network now brings a large-scale geothermal solution into active service, strengthening the role of local renewable heat in urban decarbonization. This is not just another infrastructure announcement. It is a concrete example of how a municipality-led energy project, supported by public institutions and delivered by an experienced private operator, can become a visible climate solution for thousands of households and public buildings. With 88% renewable energy on the grid, the project stands out as one of the strongest district heating examples in the Île-de-France region. A project shaped by local transition goals Réseau Terra Confort was built around a simple but ambitiou...

Colombia Grants El Barranquero Geothermal Exploration Permit, Advancing Policy, Investment, and Renewable Energy Growth

Colombia Grants Geothermal Exploration Permit to El Barranquero Project A New Signal for Colombia’s Geothermal Future Colombia has taken another decisive step in geothermal energy by granting an exploration permit for the El Barranquero project, a move that strengthens the country’s push to diversify its clean energy mix. The permit is more than a routine approval; it shows that geothermal is moving from policy ambition to practical development in a market that has long talked about its potential but struggled to unlock it. The project sits between Samaná in Caldas and Nariño in Antioquia, placing it in one of the areas identified for geothermal development by Colombia’s geological authorities. That geographic detail matters because geothermal projects depend heavily on site quality, underground heat, and long-term regulatory certainty. What the Permit Covers The Ministry of Mines and Energy granted the permit for five years, giving the developers time to carry out a full ex...

Blowout at Cape Station: Fervo Energy’s First Major Crisis After Blockbuster IPO

Just weeks after a record-breaking IPO, the flagship project of the "geothermal unicorn" faces its first major operational crisis. By : Robert Buluma Beaver County, Utah – The morning of May 27, 2026, began like any other at the Cape Station construction site in rural Utah. Workers for Fervo Energy, the newly public darling of the renewable energy world, were engaged in the complex task of drilling deep into the Earth’s crust to unlock what the company promised would be the future of 24/7 clean power. But by the afternoon, the routine had turned into a crisis. The site had experienced a blowout—an uncontrolled release of fluid or pressure from a well. For any energy company, a blowout is a serious matter. For Fervo Energy, which had just raised $1.89 billion in a blockbuster Nasdaq debut two weeks prior, it represents an immediate stress test of its technology, its safety protocols, and its $7.7 billion market valuation. While the well has since been contained and no injur...

Geothermal Project Finance Structuring: SPVs, Mezzanine Debt, Blended DFI Finance and Contingent Capital for Drilling Risk

Geothermal Project Finance Structuring: SPVs, Mezzanine Debt and Blended Capital for Drilling Risk Image : A depiction of a geothermal complete project Geothermal power sits in an awkward place on the project finance spectrum. It behaves like long‑lived infrastructure once it’s operating, but it looks like frontier exploration during the early drilling phase. To build bankable deals in that environment, developers and investors have had to invent a toolkit of SPV structures, mezzanine drilling tranches, blended public–private finance and contingent instruments that allocate subsurface risk without blowing up returns. This is not just a technicality for lawyers and bankers. The way geothermal deals are structured determines whether otherwise viable resources ever reach financial close. It also shapes how much upside sponsors keep via GP carry, how quickly equity can recycle, and how development platforms position themselves in a crowded clean‑energy pipeline. Why geothermal is stru...

ALPHAXIOMS Geothermal News & Energy Research

Search This Blog

Just In

Best Geothermal Drilling Companies in the World: Top Global Leaders, Deepest Wells, Major Projects, and Future Market Outlook