Google and Energy Dome Revolutionize Energy Storage with CO₂ Battery Breakthrough

Long-Term Energy StorageGrid StorageBatteries

In a groundbreaking move, Google and Energy Dome have partnered to deploy long-duration energy storage across Europe and North America, marking a significant step in the energy transition.

TL;DR
• Google and Energy Dome partner to deploy long-duration energy storage across Europe and North America.
• The CO₂ battery technology uses carbon dioxide in a closed-loop thermodynamic cycle.
• The Ireland project is the first commercial deal between the two companies, with a 23 MW / 200 MWh capacity.

Summary
The CO₂ battery project in County Offaly, Ireland, marks a pivotal step for long‑duration energy storage, enabling surplus renewable electricity to be stored and dispatched during peak demand. This initiative aligns with Google’s 2030 carbon‑free energy goal and supports Ireland’s target of 80% renewable electricity by 2030.
• 23 MW/200 MWh capacity delivers 8–12 hour dispatchable power, filling the gap left by short‑duration lithium‑ion batteries.
• Repurposing a former peat‑fired site reduces land use and accelerates clean‑energy transition.
• A 10‑year capacity contract with EirGrid signals strong grid operator confidence and long‑term reliability.
• The CO₂ cycle uses closed‑loop thermodynamics, avoiding mineral supply constraints and offering scalable, low‑carbon storage.
• Expansion plans include a second 200 MWh unit, positioning Offaly as a regional storage hub.

The technology’s design—compressing CO₂ into liquid, capturing heat, then expanding it to drive turbines—provides firm, dispatchable power for 8–24 hours. This capability is critical for managing high wind penetration, grid congestion, and the rapid rise in electricity demand from data centers and electrification. By bridging multi‑hour renewable gaps, the system enhances grid resilience and reduces reliance on gas‑fired peaker plants.

Globally, the energy storage market is accelerating as renewables grow. Long‑duration solutions like CO₂ batteries, pumped hydro, and compressed‑air storage are becoming essential for balancing supply and demand. Google’s partnership with Energy Dome demonstrates a shift from pilot projects to commercial deployment, with similar 19 MW/200 MWh projects in Arizona. These coordinated efforts signal a broader strategy to deploy scalable, low‑carbon storage across Europe and North America, supporting net‑zero targets and ensuring reliable, clean electricity for future growth.

As the energy transition accelerates, projects like this could play a growing role in creating more reliable, flexible, and low-carbon electricity systems worldwide.