23 MW / 200 MWh CO2 battery near Rhode in County Offaly, Ireland, on a decommissioned peat plant. 10-year capacity contract with EirGrid, partnership with Google.
Announced June 2026; site secured with planning approval; 10-year grid contract; online 2028.
Checked 10 Oct0 updates this week
Grid power (from Irish renewables) drives compressors that squeeze CO2 into high-pressure tanks for storage.
Compressed CO2 is stored in tanks at the former power plant. The site's grid infrastructure is reused, lowering costs.
When grid demand peaks, high-pressure CO2 expands through turbines connected to a generator, producing electricity for the Irish grid.
| Spec | Ireland CO2 Battery (Google / EirGrid) |
|---|---|
| Power capacity | 23 MWR (reported) |
| Energy storage | 200 MWhR (reported) |
| Discharge duration | ~8–10 hoursR (reported) |
| Site | County Offaly, former peat power plantR (reported) |
| Contract duration | 10 years with EirGridR (reported) |
R reported by the company
| Spec | Ireland CO2 Battery (Google / EirGrid) | Energy Dome Arizona CO2 Battery (Google / SRP) |
|---|---|---|
| Power capacity | 23 MWR (reported) | 19 MWR (reported) |
| Energy storage | 200 MWhR (reported) | 200 MWhR (reported) |
| Discharge duration | ~8–10 hoursR (reported) | ~8–10 hoursR (reported) |
| Site | County Offaly, former peat power plantR (reported) | Coronado Generating Station, ArizonaR (reported) |
R reported by the company
Energy Dome
CO2 battery long-duration energy storage, grid storage
Energy Dome develops long-duration energy storage using compressed CO2. It compresses CO2 with renewable power, stores it in tanks, and expands through turbines to generate electricity on demand. Unlike lithium-ion, it avoids lithium and rare minerals.
