Google and Energy Dome sign first bilateral commercial contract for 23MW/200MWh CO2 battery project in Ireland

Google and Energy Dome said they have agreed on what they described as their first bilateral commercial contract for a long-duration energy storage project in Ireland: a 23 megawatt, 200 megawatt-hour “CO2 Battery” installation.

The announcement, released on June 23 and attributed to Energy Dome and Google, frames the contract as an initial commercial milestone within a broader, multi-continent energy storage buildout effort.

Long-duration energy storage is designed to hold electricity for extended periods rather than only minutes to hours, helping grid operators balance renewable generation variability. Energy Dome’s approach is described as using CO2 as the working medium, which it markets as a “CO2 Battery” for grid-scale storage applications.

For Google, the practical implication is procurement and deployment of storage capacity that can support reliability where renewable energy supply and demand do not line up. For Energy Dome, the contract adds a named, utility-relevant commercial reference point tied to a specific scale, 23MW / 200MWh, rather than a general development statement.

The parties did not provide additional published particulars in the information available for this coverage, such as the contract duration, the location’s grid connection details, expected start of operations, or how performance will be measured and paid for.

While the announcement characterizes the Ireland project as the first bilateral commercial effort, it does not specify which other continents or countries are next, nor does it disclose a pipeline size beyond the Ireland program.

Until more documentation is released, observers will be left to reconcile how this bilateral contract fits into each company’s broader energy strategy and what portion of the overall storage deployment is covered by signed commercial terms versus remaining in development.