Google sees CO2 batteries as large-scale way to store renewable energy

Google is investing in and commissioning CO2 batteries from Energy Dome to provide scalable, long-duration renewable energy storage for its data centers in the US, Europe, and Asia, addressing lithium-ion limitations like 4-8 hour capacity. The technology stores excess renewables as compressed CO2 in expandable domes; expansion drives turbines for power, offering 30% lower costs per kWh, three times lithium-ion lifespan, and quick deployment on ~5 acres versus decade-long pumped-hydro projects. Energy Dome’s 2 MWh Sardinia pilot demonstrates viability; Google prioritizes standardization for global use, despite minor CO2 leak risks, as Alliant Energy advances a similar project in Wisconsin.
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