Google Backs Giant CO₂ Battery to Power Ireland With Wind

Ireland is about to get the world's most innovative battery, and it doesn't use lithium at all.

Google and Energy Dome just announced a revolutionary 23 MW energy storage project in County Offaly, Ireland, that uses carbon dioxide to store renewable electricity for 8 to 12 hours. The system will capture surplus wind power when it's abundant and release it during peak demand, solving one of clean energy's biggest challenges.

The project marks the first commercial partnership between Google and Energy Dome. It's expected to begin operations in 2028 under a 10-year agreement with EirGrid, Ireland's grid operator.

Ireland makes a perfect testing ground for this technology. The country aims to generate 80% of its electricity from renewable sources by 2030, creating a massive need for storage that can bridge the gaps when wind turbines slow down but homes and businesses still need power.

The timing couldn't be better. The battery will sit on the site of a former peat-fired power station near the town of Rhode, transforming old fossil fuel infrastructure into clean energy storage. Its 200 MWh capacity means it can power thousands of homes through evening peaks after solar output drops.

This isn't an isolated experiment. Energy Dome announced a similar 19 MW project in Arizona, signaling a coordinated global expansion strategy. Together, these deployments show that long-duration storage technology is ready to move from pilot programs to real-world solutions.

The system works through a closed-loop process using carbon dioxide. When excess renewable energy is available, it compresses CO₂ into liquid form, storing the energy. When power is needed, the CO₂ expands back into gas, driving turbines to generate electricity. The entire process happens in a sealed system with no emissions.

For Google, this project is about more than climate goals. The tech giant is working toward 24/7 carbon-free energy by 2030, meaning every hour of electricity use must be matched with clean generation. Traditional lithium batteries typically last only 1 to 4 hours, but Energy Dome's technology extends that window dramatically.

Vanessa Hartley, Head of Google Ireland, emphasized the importance of grid resilience. The project will help scale promising long-duration energy storage technology toward an affordable, secure and clean energy future.

The Ripple Effect

This breakthrough could reshape how countries approach renewable energy. Wind and solar have become cheaper than fossil fuels, but their intermittent nature has held back faster adoption. Long-duration storage removes that barrier.

Ireland faces unique pressures with rapid growth in electricity demand from data centers and high wind penetration creating grid congestion. The Offaly project's location near transmission lines serving Greater Dublin positions it to ease both challenges simultaneously.

Other regions watching Ireland's renewable transition closely will now have a proven model for integrating higher percentages of wind and solar power. As Energy Dome scales production and costs continue falling, this technology could become standard infrastructure alongside wind farms and solar arrays.

The shift from fossil fuel sites to clean energy storage also offers a blueprint for communities losing traditional power jobs. Repurposing existing energy infrastructure preserves some employment while supporting climate goals.

One innovative battery in rural Ireland is proving that the clean energy future has finally found its missing piece.