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Dec 2, 2021

Energy Dome to deploy low-cost, long-duration CO2 battery in Italy

Posted by in categories: energy, sustainability

An Italian energy storage company, Energy Dome, has announced the close of its $11M Series A fundraise, with the goal of deploying the first commercially viable CO2 battery in a demonstration project in its native Sardinia, Italy. The proposed 100 megawatt-hours (MWh) CO2 Battery could support the increased use of renewable power in the generation mix and address the growing need for energy storage on electrical grids.

The CO2 Battery’s optimal charge/discharge cycle ranges from 4 to 24 hours, positioning it perfectly for daily and intra-day cycling. The company points out that this is a fast-growing market segment, not well served by existing battery technologies. Significantly, the CO2 Battery can be charged during the daytime when there is a surplus solar generation and dispatched during the subsequent evening and next-morning peaks, when solar generation falls short of demand. The modular, scalable energy storage solution will allow for solar and wind generation to be dispatchable 24 hours per day.

Using low-cost, off-the-shelf components, the company claims that its CO2 battery achieves a 75–80% round-trip efficiency. Unlike lithium-ion batteries, which degrade significantly in performance after roughly a decade of use, the battery maintains its performance during its expected 25-year operational life. This means the cost of the storage will be about half of the cost of storing with similar-sized lithium-ion batteries.

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