Energy Dome's CO2 battery gains traction globally

SPECTRUM.IEEE.ORG

'inflatable dome'

SUMMARY

Energy Dome, a Milan-based company, has developed the "CO2 Battery," a novel long-duration energy storage system using a large inflatable dome to hold 2,000 tonnes of supplied carbon dioxide in a closed loop. The facility in Ottana, Sardinia—completed in July—compresses CO2 into liquid for storage during excess renewable energy periods and expands it through a turbine to generate electricity when needed.

It delivers 200 megawatt-hours, equivalent to 20 MW over 10 hours. This technology addresses the limitations of lithium-ion batteries, which typically provide only 4-8 hours of storage.