According this website:
The only viable alternative for long-duration energy storage
The CO2 Battery in a nutshell
Closed thermodynamic transformation
Manipulation of CO2 between its gaseous and liquid phase
CO2 warms up, evaporates, and expands, turning a turbine to generate electricity
Energy storage sweet spot between 8/24 hours
Zero CO2 emissions into the atmosphere during the entire process
No cryogenic temperatures and high costs that are typically associated with compressed air energy storage
Massive reduction of costs by storing the CO2 at ambient temperature in its liquid phase
Patented technology that uses only water, steel, and CO2
All components are readily available worldwide from multiple Tier 1 suppliers
“Energy Dome’s technology uses a thermodynamic cycle, charging by drawing carbon dioxide from a ‘Dome’ gasholder, storing it under pressure, and then dispatching it by evaporating and expanding the gas through a turbine back into the gasholder.”
CO2 is the solution for long-duration energy storage
At the core of our solution, there’s our patented CO2-based technology. This is the only alternative to expensive, unsustainable lithium batteries currently used for energy storage. The CO2 Battery is a better-value, better-quality solution that solves your energy storage needs, so you can start transitioning to alternative energy sources today.
CO2 Battery Lithium-Ion battery Round Trip Efficiency 75%+ (no degradation over time) 85% (high degradation over time) Lifetime 30+ Years <12 Years CAPEX 1x 1.7x Depth of Discharge (DoD) 100% <80% Components Availability Global Limited No Critical Materials Physical Inertia Off-the-shelf Components Installation Time <2 years <2 years
Some information on
My take: as a start, this could be a complement of the ground station for reeling AWES, for temporary storage during reel-in recovery phase.