Novel CO2-Based Electrothermal Energy And Geological Storage System

Solutions developed

The phasing out of fossil fuels and the achievement of the ‘net zero emissions’ target is a top priority in the EU. In the context of an ambitious energy transition, it’s important to design cross-sectoral technology that is both technologically and economically feasible. This is the aim of the EU-funded CEEGS project. It will develop a renewable energy storage system based on the transcritical CO2 cycle, CO2 storage in geological formations and geothermal heat extraction. Extended capacity is obtained due to the underground system. The project will follow a three-phase approach. The first phase progresses from theoretical principles to models and simulations. The second phase moves to systems verification, and the third phase includes social, economic and sustainability assessments.

Main results

CEEGS (CO2 based electrothermal energy and geological storage system) is a cross-sectoral technology for energy transition, with a renewable energy storage system based on the transcritical CO2 cycle, CO2 storage in geological formations and geothermal heat extraction. It is a highly efficient, cost-effective, and scalable (small-to large-scale) concept for large-capacity renewable energy storage. Extended capacity is obtained due to the underground system. It can be integrated into the grid, heating and cooling districts and industries. It also has the capacity for partial CO2 sequestration.