The 23MW/200MWh CO2 Battery project marks the first bilateral commercial agreement between the companies, relieving grid congestion, promoting energy security and accelerating a 24/7 carbon-free energy solution in Ireland and beyond
DUBLIN & MILAN, June 23, 2026–(BUSINESS WIRE)–Today Energy Dome, a leading long-duration energy storage technology developer, and Google announced their first bilateral commercial contract for a 23MW / 200MWh CO2 Battery project located in County Offaly, Ireland. The project is part of a long-term partnership the companies announced last year to deploy Energy Dome’s CO2 Battery technology at scale and advance Google’s ambition to expand access to affordable, secure and 24/7 clean energy for grids globally. This announcement is on the back of a 19 MW/200 MWh project in Arizona announced this month by Energy Dome, Google, and the local utility SRP.
This project will be developed, owned and operated by Energy Dome using its proprietary CO2 Battery technology. The technology works by using grid power to compress and store CO2, then, when power is needed, expanding the CO2 through a turbine to generate energy that is sent back to the grid.
Strengthening grid reliability and sustainability in Ireland
The Irish government has identified long-duration energy storage as a key solution for ensuring security of electricity supply, reducing system costs, and enabling Ireland’s ambitious policy framework to reach 80% renewable electricity by 2030.
Through this commercial project, Google and Energy Dome aim to establish a blueprint for how long-duration energy storage technology can contribute to an affordable, secure and clean electricity system in Ireland. By absorbing surplus energy during periods of oversupply and dispatching firm power during periods of system stress, Energy Dome’s CO2 Battery can enable smart, cost-effective utilization of the grid’s renewable energy resources to balance the system while alleviating local grid congestion bottlenecks.
Located in County Offaly in the Irish Midlands near the town of Rhode, the site is strategically located on a critical node of the Irish electric grid, with high-voltage lines serving the Greater Dublin metropolitan area. Expanding energy resources in this area of the country is essential to greater economic growth in Irish demand centers.
Developed in concert with Lumcloon Energy, a leading local developer based in the Midlands, Energy Dome’s project creates jobs and long-term community benefits from deploying its cutting-edge technology. The project is sited on a former peat-fired thermal power plant, and will provide a second life for this brownfield industrial land by repurposing it into an engine for the clean energy transition. Located near the Rhode Green Energy Park, the surrounding area has abundant energy resources, including solar and wind, which suffer from curtailment due to high congestion in the local grid. By storing energy for later dispatch, the project provides congestion relief and avoids the costly buildout of transmission lines, translating into greater affordability for all users on the grid.
