"Now, as IEEE Spectrum reports, a Milan-based company called Energy Dome has come up with an intriguing approach that stores energy in enormous domes that are filled with compressed carbon dioxide gas. The idea behind the "CO2 battery" is simple. By compressing the gas using excess green power, it can later be depressurized to spin large turbines. A fully charged facility can store a formidable 200 megawatt-hours of electricity - enough to power around 6,000 homes for a full day."
"To charge, the battery uses a thermal-energy storage system to cool the CO2 down to ambient pressure, and a condenser turns it into a liquid over a span of ten hours. To discharge it, the CO2 is evaporated and heated to power the turbine. The goal is to bridge the gap between when renewable energy is available and when it's actually needed through a "long-term duration energy storage" (LDES) solution."
Energy Dome's CO2 battery stores electricity by compressing carbon dioxide into giant domes and later depressurizing it to drive turbines. Charging uses excess renewable power to cool and condense CO2 via a thermal-energy storage system over about ten hours; discharging evaporates and heats the CO2 to run the turbine. A full facility can store roughly 200 megawatt-hours, sufficient for about 6,000 homes for a day, targeting long-duration energy storage needs that align supply with delayed demand. A pilot is under construction on five hectares in Sardinia, and Google has announced a deployment partnership.
Read at Futurism
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