The FlexGeo project, funded under the European Union’s Horizon 2020 research and innovation program, has been launched to develop innovative designs in geothermal energy systems that aim to maximize performance and flexibility. This initiative is marked by the introduction of the first worldwide demonstration of a reversible 200 kWel modular Organic Rankine Cycle (ORC) / high-temperature heat pump (HTHP) system tested at a Technology Readiness Level (TRL) of 7.
A key component of FlexGeo involves integrating modular reversible ORC units with underground thermal energy storage systems and advanced control technologies. This integration is designed to provide grid flexibility and adapt to market signals throughout the year, while meeting current heating demands.
The project will also implement advanced control strategies using artificial intelligence, including reinforcement learning techniques, to enhance the flexibility and efficiency of ORC and HTHP systems. These advancements are expected to improve the monitoring and maintenance of system components, potentially reducing ramp-up times and increasing the flexibility of smart thermal grids.
Uniquely, the reversible feature of the ORC unit allows it to function as both an electricity producer and consumer, thereby doubling its capacity to provide secondary control reserves depending on energy system demands.
The FlexGeo consortium includes several European academic and industry partners:
- Technische Universität München, Germany (Project Coordinator)
- Technische Universität Wien, Austria
- National Technical University of Athens, Greece
- Université de Liège, Belgium
- Institut Cartogràfic i Geològic de Catalunya, Spain
- ORCAN Energy AG, Germany
- Zentrum für Energiewirtschaft und Umwelt, Austria
- Ambiente Italia SRL, Italy
- Diadikasia S.A., Greece
- Conselh Generau d’Aran, Spain
- Eidgenössische Technische Hochschule Zürich, Switzerland
This collaborative effort not only aims to enhance geothermal technology but also supports the European goal of transitioning to a more sustainable and flexible energy system.
