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Abstract

Summary

In this paper, the preliminary results of the feasibility assessment of a novel CO2-based electrothermal energy and geological storage system (CEEGS) at the former onshore pilot CO2 storage site at Ketzin in the North German Basin are presented. The concept combines the flexible storage of renewable power, carbon capture, utilisation and storage (CCUS), as well as geothermal energy utilization. The system may provide several MW-scale buffer capacity for balancing non-dispatchable wind and solar energy resources and additional value for CCUS projects by utilizing carbon dioxide as working fluid. Coupled surface-subsurface numerical simulations are conducted to address the challenge between these two system components. A doublet system is investigated in the Triassic Buntsandstein Formation, which has been a target for geothermal utilisation in Germany. The simulation results of simplied short-term energy storage cycles show not only that the CEEGS concept is feasible at the study site, but a round-trip efficiency of 67 % can be achieved for a system with a charge capacity of 2500 kW.

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/content/papers/10.3997/2214-4609.202522064
2025-09-01
2026-02-15
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