Google bets on inflatable CO2 batteries to lock down data center power
By ljdevon // 2026-01-23
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In a strategic move to secure its vast digital empire, Google is turning to an unconventional and massive-scale energy storage technology: inflatable carbon dioxide batteries. Partnering with Italian firm Energy Dome, the tech behemoth is commissioning the construction of these so-called CO2 batteries to provide what it calls green, reliable backup power for its critical data centers across the United States, Europe, and Asia. This initiative, born from a global search for long-duration energy storage, reveals Google's attempt to solve the inherent instability of wind and solar power while cementing its own operational independence, even as critics question the environmental and social implications of such large-scale technological consolidations of power. Key points:
  • Google is investing in and deploying large-scale CO2 battery systems from Energy Dome to back up its global data center operations.
  • The technology uses stored carbon dioxide in an expandable dome, compressing and expanding the gas to generate electricity, aiming for longer duration and cheaper storage than lithium-ion batteries.
  • The first operational facility in Sardinia, Italy, can store 2,000 tons of CO2 and generate 200 megawatt-hours of electricity.
  • Google cites standardization and scalability as key advantages, with the systems needing only about five acres of flat land and a faster construction timeline than alternatives like pumped-hydro.
  • The move highlights the immense, growing energy demands of Big Tech's infrastructure and its pursuit of control over its own power supply chain.

The architecture of energy dependence

The modern digital world runs on data centers, energy-hungry facilities that require constant, immense power. To burnish its environmental credentials, Google, like other tech giants, has invested heavily in purchasing renewable energy. However, the sun sets and the wind stops, creating a fundamental mismatch between when green power is generated and when it is desperately needed. Until now, the primary tool for bridging this gap has been vast farms of lithium-ion batteries. Yet these come with severe limitations, typically providing cost-effective backup for only four to eight hours—insufficient for a prolonged windless night, a string of cloudy days, or a peak heatwave when energy demand soars. Google's pivot to CO2 batteries is a direct response to this vulnerability. The technology functions as a mechanical battery. Excess renewable energy is used to compress and liquefy carbon dioxide, storing it under a giant, flexible dome. When power is needed, the liquid CO2 is warmed, expanding back into a gas to drive a turbine. Energy Dome claims this system can deliver power for 10 hours or more, at a cost projected to be 30% cheaper than lithium-ion, with a lifespan nearly three times as long. For a corporation whose influence and revenue depend on uninterrupted service, securing such a resilient and potentially economical power source is a strategic imperative, not merely an environmental one.

Beyond the green facade: questions of scale and control

While promoted as a green solution, the CO2 battery project invites scrutiny familiar to observers of Big Tech's expansion. The Sardinia facility, while small in land footprint, features a dome reaching the height of a sports stadium, a visual and physical imposition that has already sparked concerns about local opposition and safety. Energy Dome CEO Claudio Spadacini has downplayed risks, stating a catastrophic release of the stored CO2 would be comparable to emissions from several transatlantic flights. However, this framing normalizes the localized concentration of risk for the benefit of a global corporation's infrastructure. This venture is more than an engineering experiment; it is a step toward deeper technological sovereignty for Google. By developing a standardized, deployable energy storage unit, Google moves closer to decoupling its core operations from the public grid and its fluctuations. This pursuit of self-reliance mirrors a broader trend in the tech industry, where control over every layer of the stack—from hardware and software to now, energy—is seen as paramount. The partnership gives Google an equity stake in the technology's future, potentially allowing it to shape and benefit from its widespread adoption. As public utility Alliant Energy in Wisconsin also moves to build a CO2 battery for grid storage, the technology could become another pillar supporting an increasingly centralized digital ecosystem, raising profound questions about who ultimately controls the essential resources of the information age. Sources include: UtilityDive.com Spectrum.ieee.org Enoch, Brighteon.ai
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