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Arverne and Banque des Territoires Advance Geothermal Expansion Across the Île-de-France Region

Arverne and Banque des Territoires Accelerate Geothermal Energy in Île-de-France as France Deepens Its Clean Heat Revolution By: Robert Buluma   France’s geothermal ambitions have entered a bold new chapter. In a landmark move that could redefine how urban regions heat their homes, industries and public infrastructure, Arverne and Banque des Territoires have announced the creation of Francilienne de Géothermie , a dedicated company focused on developing, financing and operating geothermal projects across the Île-de-France region. The announcement, made on May 18, 2026, signals far more than another renewable energy partnership. It represents a strategic attempt to transform geothermal energy into one of the dominant pillars of regional decarbonization in France’s most densely populated and economically influential territory. At the center of this initiative lies a compelling idea: that the future of urban heating may not come from imported fossil fuels or unstable electricity...
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Graz Revives Landmark Geothermal Project as OMV Targets Exploratory Drilling in 2026

Graz Revives Ambitious Geothermal Heating Project as OMV Eyes Exploratory Drilling in 2026 By: Robert Buluma   The Austrian city of Graz is once again positioning itself at the forefront of Europe’s geothermal transition after new agreements were successfully renegotiated between the City of Graz, OMV , and Energie Steiermark for a large-scale geothermal heating project that had unexpectedly stalled in late 2025. The revived initiative, centered on supplying renewable heat to Graz’s district heating network, now appears back on track with exploratory drilling potentially beginning before the end of 2026. The development marks a critical moment not only for Austria’s geothermal ambitions but also for Europe’s broader struggle to reduce dependence on fossil fuels amid volatile energy markets, geopolitical instability, and rising heating costs. If successful, the Graz geothermal project could become one of the continent’s most important urban geothermal heating systems, demonstrati...
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Rodatherm Energy: The Refrigerant Gambit

By: Robert Buluma   Rodatherm Energy has done something no other geothermal startup has attempted at commercial scale: swapped water for refrigerant in a closed-loop system. The claim is 50% higher thermal efficiency than water-based binary cycles, achieved by circulating a proprietary phase-change fluid through a fully cased, pressurized wellbore. The company emerged from stealth in September 2025 with a $38 million Series A—the largest first venture raise in geothermal history. Lead investor Evok Innovations was joined by Toyota Ventures, TDK Ventures, and the Grantham Foundation. The engineering thesis is elegant. The execution risks are significant. This is an Alphaxioms examination of both. II. The Thermodynamic Distinction Every geothermal company you've covered moves heat using water or steam. Rodatherm moves heat using a fluid that boils and condenses inside the wellbore. In a conventional closed-loop water system (Eavor's model), water circulates as a single-phase liq...
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Green Therma Advances Denmark Geothermal District Heating Through Seismic Surveys

Green Therma’s Seismic Milestone Signals New Momentum for Denmark’s Geothermal Future By; Robert Buluma   Image: Green Therma Advances Denmark Geothermal District Heating Through Seismic Surveys The race to decarbonize Europe’s heating sector is intensifying, and Denmark is quietly positioning itself at the forefront of one of the most promising transitions in modern energy systems geothermal district heating. In a significant development that could reshape Aalborg’s renewable heating ambitions, Green Therma has announced the successful completion of seismic surveys around Storvorde, marking a major milestone in the company’s Heat4Ever™ geothermal demonstration project. The announcement may appear procedural at first glance, but beneath the surface literally and figuratively lies a much bigger story. Seismic campaigns are among the most critical phases in geothermal development. They provide the geological intelligence required to determine whether underground reservoirs possess ...
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Colorado’s $12.4M Geothermal Push Signals a Structural Shift in Clean Energy Strategy

Colorado’s $12.4M Geothermal Investment Signals a Structural Shift in Clean Energy Strategy By:  Robert Buluma Colorado’s latest announcement of $12.4 million in geothermal funding is more than a routine clean energy allocation—it is a clear indicator that geothermal development in the United States is transitioning from experimental pilot projects into structured, institutional deployment and early-stage grid integration planning. The funding, distributed across seven projects, spans two major categories: building-focused geothermal heating and cooling systems, and early-stage geothermal electricity generation exploration. While the headline figure is modest compared to solar or wind investment volumes, the strategic signal embedded in how the money is distributed is far more important than the total dollar amount. Colorado is not simply funding renewable energy. It is actively testing whether geothermal energy can evolve into a dual-purpose infrastructure layer—serving both th...
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