Google and Energy Dome have signed their first bilateral commercial agreement to develop a 23 MW/200 MWh long-duration energy storage project in County Offaly, Ireland, marking a significant step in their global partnership to accelerate the deployment of advanced energy storage technologies and strengthen the transition to reliable clean electricity.
The project will be developed, owned and operated by Energy Dome using its proprietary COâ‚‚ Battery technology. The system stores surplus electricity by compressing carbon dioxide and later releases the stored energy by expanding the gas through a turbine to generate electricity when demand rises. The technology is designed to provide long-duration energy storage using widely available industrial components, reducing dependence on critical minerals commonly used in conventional battery systems.
The Irish project follows the announcement earlier this month of a 19 MW/200 MWh COâ‚‚ Battery installation in Arizona developed by Energy Dome in collaboration with Google and utility company SRP, reflecting the companies’ strategy to expand the technology across multiple global markets.
Located near the town of Rhode in County Offaly, the facility will be constructed on the site of a former peat-fired power station, transforming the brownfield industrial location into a clean energy asset. The project will also support local employment while contributing to the redevelopment of Ireland’s Midlands energy corridor.
The location was selected because it sits on a strategically important section of Ireland’s electricity network, where high-voltage transmission lines supply the Greater Dublin region. The surrounding area hosts significant wind and solar generation capacity, much of which experiences curtailment due to grid congestion. By storing excess renewable electricity and supplying power during periods of high demand, the project is expected to improve grid flexibility, reduce renewable energy wastage and ease pressure on transmission infrastructure.
Energy Dome developed the project in partnership with Lumcloon Energy, a renewable energy developer based in Ireland’s Midlands. The facility has already secured land, planning approval and a grid connection. It has also received a 10-year capacity contract from Ireland’s transmission system operator, EirGrid, with commercial operations expected to begin in 2028.
Claudio Spadacini, Founder and Chief Executive Officer of Energy Dome, said the project represents the first commercial deployment under the strategic partnership with Google and demonstrates how long-duration energy storage can improve grid resilience while supporting continuous carbon-free electricity. Vanessa Hartley, Head of Google Ireland, said the agreement reflects Google’s commitment to supporting innovative energy technologies that enhance electricity system reliability and accelerate the deployment of clean power solutions.
Energy Dome also plans to develop a second 200 MWh storage unit at the same location, creating a long-duration energy storage hub capable of supporting Ireland’s renewable energy ambitions. The project is expected to play an important role in strengthening energy security, improving grid reliability and enabling greater integration of renewable electricity as demand continues to rise from industries, digital infrastructure and emerging technologies.
