EGU24-14959, updated on 09 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

TRANSGEO - Transforming abandoned wells for geothermal energy production

Hannes Hofmann1, Julie Friddell1, Ingo Sass1, Thomas Höding2, Katrin Sieron2, Max Svetina3, Monika Hölzel4, Robert Philipp5, György Márton6, Balázs Borkovits7, Klára Bődi8, Alen Višnjić9, Tomislav Kurevija10, and Bojan Vogrinčič11
Hannes Hofmann et al.
  • 1Helmholtz Centre Potsdam GFZ - German Research Centre for Geosciences, Potsdam, Germany (
  • 2State Office for Mining, Geology and Raw Material of Brandenburg, Cottbus, Germany
  • 3ONEO GmbH, Hannover, Germany
  • 4Geosphere Austria, Vienna, Austria
  • 5Greenwell Energy GmbH, Vienna, Austria
  • 6CROST Regional Development Nonprofit Ltd., Pécs, Hungary
  • 7University of Pécs, Pécs, Hungary
  • 8Mining Property Utilization Nonprofit Public Ltd., Budapest, Hungary
  • 9Medjimurje Energy Agency Ltd., Čakovec, Croatia
  • 10University of Zagreb - Faculty of Mining, Geology and Petroleum Engineering, Zagreb, Croatia
  • 11Local Energy Agency Pomurje, Martjanci, Slovenia

TRANSGEO is a regional development project that aims to explore the potential for producing sustainable geothermal energy from abandoned oil and gas wells in central Europe.  Composed of 11 partner organizations and 10 associated partners in 5 countries, TRANSGEO is developing a Transnational Strategy and Action Plan to address this technical and economic opportunity.  Our primary objective is to support rural communities and industries in the energy transition by providing tools and information that highlight sustainable redevelopment priorities and opportunities.

To reach this objective and promote the switch from fossil fuels to green energy, TRANSGEO is developing reuse procedures for five different geothermal technologies and validating them via numerical modelling, to assess their performance in repurposing existing hydrocarbon infrastructure and determine the optimal reuse conditions and configurations.  The five geothermal technologies are Aquifer Thermal Energy Storage, Borehole Thermal Energy Storage, Deep Borehole Heat Exchangers, Enhanced Geothermal Systems, and Hydrothermal Energy production.  The modelling studies focus on reference sites in our study areas, the North German Basin, the South German Molasse Basin, the Vienna Basin, and the Pannonian Basin.  Comparison of varying wellbore and reservoir parameters in the numerical modelling studies will provide input to a new online well assessment tool which will be available publicly to determine well suitability and guide planning for future reuse projects.  The online tool will be informed by a database of abandoned wells in Austria, Croatia, Germany, Hungary, and Slovenia and will include local reference data, such as geology, topography, heat demand, and utilities.  This will facilitate well reuse by matching candidate wells with local energy demand and heating networks.  Additional work on socio-economic and policy analyses will provide financial and liability information for the 5 different geothermal technologies, across the project countries.  Finally, the partnership will propose a legal policy and incentive framework to facilitate and expand reuse of abandoned wells for geothermal energy production and storage across central Europe.

TRANSGEO is co-funded by the European Commission’s Interreg CENTRAL EUROPE programme.

How to cite: Hofmann, H., Friddell, J., Sass, I., Höding, T., Sieron, K., Svetina, M., Hölzel, M., Philipp, R., Márton, G., Borkovits, B., Bődi, K., Višnjić, A., Kurevija, T., and Vogrinčič, B.: TRANSGEO - Transforming abandoned wells for geothermal energy production, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-14959,, 2024.