Energy Battery Projects
Energy Dome Brought Its Carbon Dioxide Battery to Arizona's Power Grid
Adam Harrie — June 15, 2026
Energy Dome and Salt River Project announced an agreement to install a 19MW, 10-hour-long-duration energy storage system, a Carbon Dioxide Battery, in St. Johns, Arizona, using Energy Dome's patented CO₂ Battery technology. The system compresses CO₂ with grid power and releases it through a turbine to generate electricity on demand, storing enough energy to power approximately 4,275 homes for 10 hours.
Google is co-funding the project through a cost-sharing agreement with SRP as part of a broader collaboration to accelerate the deployment of non-lithium-ion energy storage. The facility will be co-located at SRP's Coronado Generating Station and operated under a 20-year tolling agreement, with performance data monitored by the independent energy research institute EPRI.
The Arizona project shows how CO₂-based energy storage is emerging as a scalable long-duration storage solution that can support grid reliability while expanding beyond lithium-ion technologies.
