Novel CO2-based electrothermal energy and geological storage system

CEEGS is a 3-year long Horizon Europe funded project, that will develop a cross-sectoral technology for the energy transition, combining a renewable energy storage system based on the transcritical CO2 cycle, CO2 storage in geological formations and geothermal heat extraction. The main objective of the project is to provide scientific proof of the techno-economic feasibility of the technology, raising the current low Technology Readiness Level (TRL) from 2 to 4 by addressing gaps in the interface between surface trans-critical cycle and the subsurface CO2 storage.

About the Project

Our 3-phase approach

From theoretical principles to models, simulations and processes…

From models and simulations to systems/experimental …

Social, economic and sustainability assessments, incl. social acceptance studies, Life Cycle Assessment (LCA) and Techno-Economic Analysis (TEA) tools.

CEEGS Concept

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About the Project

CEEGS is a 3-year long Horizon Europe funded project, that will develop a cross-sectoral technology for the energy transition, combining a renewable energy storage system based on the trans-critical CO2 cycle, CO2 storage in geological formations and geothermal heat extraction. This system has a negative CO2 footprint as part of the stored underground CO2 is diffused into the geological formation, resulting in permanent sequestration. The main objective of the project is to provide scientific proof of the techno-economic feasibility of the technology, raising the current low Technology Readiness Level (TRL) from 2 to 4 by addressing gaps in the interface between surface trans-critical cycle and the subsurface CO2 storage.

Why

It is a scalable system with the potential for high-performance, high-capacity energy storage. It can be used for electricity storage and production, heating and cooling, also providing partial CO2 sequestration. The concept minimizes costs and surface impact, increases the energy storage capacity, and delivers energy in different forms, providing high versatility due to integration possibilities in multiple applications.

How

Development of a proof of concept, Technology Readiness Level 4, based on the integration of models for system, components and energy system integration, a lab demonstration on a 20 kW power scale, as well as experimental data focusing on the challenges for the interface between surface components and underground systems, where there is the knowledge and technological gap.

What

A novel concept integrating thermoelectric energy storage based on reversible transcritical CO2 cycles, for renewable energy, both in the form of electricity, thermal, and CO2 storage in geological formations.

Key elements of the impact

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About the Project

Scientific

Demonstration of integrated CO2 underground storage will significantly increase energy storage operational efficiency. Global advancement of the knowledge on CO2 storage and closed CO2 cycles to stimulate further scientific discoveries.

Technological/Economic

Advance in a low cost-high capacity energy storage, capable of providing dispatchable renewable electricity, hence contributing to a clean energy system that is reliable, affordable and fair. Drive technical innovations at public research institutions and companies. New partnerships, products, and services as well as economic growth of equipment manufacturer, engineering service providers and energy companies across Europe. Triggering of new investments in the technologies. Contribution to the ‘security of supply’ due to grid stabilisation.

Societal

Contribution to informed political decision-making and stimulating public discourse through our profound communication activities. Support of legislative decision-making through scientific evidence. Support of areas where the CEEGS technology will be implemented.

Environmental

Energy storage system for renewables dispatchbility, with low impact materials with safe and permanent storage of larger amounts of CO2 in geological settings.

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University of Seville | C. San Fernando, 4, 41004 Sevilla

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