Google-backed Arizona project to deploy 19MW CO2 battery for long-duration storage | carboncredit.io
gasworld.comEnergy Dome and Salt River Project (SRP) have agreed to build a 19MW carbon dioxide battery at SRP's Coronado Generating Station in Arizona. The system will store energy for 10 hours using compressed CO2, releasing it through a turbine when needed. Google is funding part of the project under a cost-sharing agreement with SRP, part of their push for non-lithium long-duration energy storage. The project is expected online in 2029 under a 20-year tolling agreement. This is one of the first commercial-scale CO2 battery deployments in the US. The technology uses grid power to compress and store CO2, then expands it to generate electricity, offering a lithium-free alternative for long-duration storage. Arizona's growing energy demand, driven partly by AI and data centers, makes it a key test market. The project could signal whether CO2 batteries become a viable option for grid reliability and renewable integration.