Google and Energy Dome have signed their first bilateral commercial agreement to deploy a 23 MW/200 MWh long-duration energy storage project in Ireland, expanding their efforts to support carbon-free electricity and strengthen grid reliability.
The project, located in Co Offaly in the midlands, will use Energy Dome’s CO2 Battery technology to store excess electricity and release it when demand rises. The companies say the system will help reduce grid congestion, improve energy security, and support Ireland’s transition to renewable power.
A rendering of Energy Dome's 23MW/200MWh CO2 Battery project planned for Co Offaly. Image: Energy Dome.
The announcement builds on a broader partnership unveiled last year between Google and Energy Dome to scale deployment of the company’s long-duration energy storage technology. It also follows the recent announcement of a 19MW/200 MWh CO2 Battery project in Arizona involving Energy Dome, Google, and utility SRP.
Energy Dome will develop, own, and operate the Irish facility. The technology stores energy by compressing carbon dioxide using electricity from the grid and later expanding the gas through a turbine to generate power when needed.
Turning surplus into power
Long-duration energy storage is becoming increasingly important as countries add more renewable energy to their power grids. Solar and wind power can generate excess electricity during periods of strong production, but that energy is often wasted if it cannot be stored for later use.
Ireland has identified long-duration storage as a key tool for maintaining electricity supply while working towards its goal of generating 80% of its electricity from renewable sources by 2030.
The Co Offaly project is located near Rhode, on a strategic section of Ireland’s electricity network that serves the greater Dublin region. The area already hosts significant renewable energy resources, including wind and solar installations, but grid congestion can limit their output.
By storing excess renewable power and dispatching it when needed, the CO2 Battery is expected to help balance the grid while reducing the need for costly transmission upgrades.
“We are proud to work with Google on a project that strengthens grid resilience and unlocks the path to 24/7 carbon-free energy in Ireland,” said Claudio Spadacini, founder and CEO of Energy Dome.
Second life for the site
The project will be built on the site of a former peat-fired power plant, giving new purpose to industrial land previously used for fossil fuel generation.
Energy Dome said the technology relies on readily available, off-the-shelf components rather than lithium-ion batteries and critical minerals. The company argues this approach can help improve supply chain resilience while providing large-scale storage capacity.
The project has already secured land rights, planning approval, and a grid connection. It has also received a 10-year capacity contract from EirGrid, Ireland’s state-owned transmission system operator.
According to the companies, the facility is expected to enter service in 2028. Energy Dome also plans to add a second 200MWh unit at the site, creating a larger long-duration energy storage hub in the midlands.
“At Google, we are committed to catalysing next-generation energy technologies to bolster grid resilience and introduce critical storage capacity to the system,” said Vanessa Hartley, head of Google Ireland.
As electricity demand continues to rise from growing industrial activity and expanding data centre infrastructure, the companies see long-duration energy storage as an important part of maintaining reliable and lower-emission power systems.