Google Invests in CO2 Batteries for Renewable Energy Storage

Jan 21, 2026, 2:23 AM
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Google is commissioning the construction of CO2 batteries to provide green, reliable backup power for its major data centers across the United States, Europe, and parts of Asia. This initiative aims to enhance the company's renewable energy storage capabilities, ensuring that data centers have access to clean power when needed.
CO2 batteries are designed to function similarly to lithium-ion batteries, which are currently the primary technology for energy storage. However, CO2 batteries offer greater capacity and scalability, making them suitable for widespread use. Ainhoa Anda, Google's senior lead for energy strategy, emphasized the importance of standardization in these systems, which can be adapted to various regional specifications.
In collaboration with Energy Dome, a Milan-based company, Google is developing a facility in Ottana, Sardinia, that stores 2,000 tons of carbon dioxide. This facility utilizes an expandable dome to store CO2, which can be compressed and expanded to generate electricity when required. The system is capable of producing 200 megawatt-hours of electricity, providing a significant power supply over extended periods.
One of the key advantages of CO2 batteries is their longevity. They are expected to last nearly three times longer than lithium-ion batteries, and their larger size can lead to a reduced cost per kilowatt-hour. Energy Dome anticipates that its CO2 battery technology will be approximately 30% cheaper than traditional lithium-ion solutions. This cost-effectiveness is crucial as Google seeks to meet increasing energy demands, particularly during peak usage times when renewable energy sources may be insufficient.
The construction of CO2 batteries also presents logistical benefits. Unlike pumped-hydro storage systems, which require specific topographical conditions and can take years to build, CO2 batteries can be constructed relatively quickly and on smaller plots of land. The Sardinia facility, for instance, was completed in less than two years, with the dome itself inflated in under half a day.
Despite the potential benefits, Google may face challenges from local communities regarding the height of the expandable dome, which is comparable to that of a sports stadium. Concerns have also been raised about the potential release of CO2 if the dome is damaged. However, Energy Dome's CEO, Claudio Spadacini, has stated that the amount of CO2 released would be minimal compared to emissions from coal plants and similar to that produced by airlines.
Google's investment in CO2 battery technology is part of a broader strategy to achieve net-zero emissions across its operations by 2030. The company aims to reduce its greenhouse gas emissions by 50% from 2019 levels and is exploring various carbon removal solutions to offset any remaining emissions.
In addition to Google's efforts, other companies are also exploring CO2 battery technology. For example, Alliant Energy in Wisconsin has received approval to construct a CO2 battery that will supply power to 18,000 homes, indicating a growing interest in this innovative energy storage solution.
As the demand for renewable energy storage continues to rise, CO2 batteries may play a pivotal role in the transition to a more sustainable energy future. By providing a reliable and scalable solution, Google and its partners are positioning themselves at the forefront of this emerging technology, which could significantly impact how renewable energy is stored and utilized.
In conclusion, Google's investment in CO2 batteries represents a significant step towards enhancing renewable energy storage capabilities. With their potential for greater efficiency and lower costs, CO2 batteries could become a vital component in the quest for sustainable energy solutions, helping to power data centers and other facilities reliably and cleanly.

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