The project, selected through a request for proposals (RFP) for LDES pilots issued by SRP in 2024 is part of tech giant Google and SRP’s collaboration to accelerate deployment of non-lithium-ion LDES technologies.
The partnership was announced in 2025 and sees Google funding a portion of the costs for LDES pilot projects developed on the grid operated by SRP. It will also evaluate data on the pilot projects’ operational performance and provide input on research and testing.
Energy Dome’s 19MW project will use the company’s CO2 Battery and proprietary thermomechanical LDES process. According to Energy Dome, it works by using power from the grid to compress and store CO2, then, when power is needed, expanding the CO2 through a turbine to generate energy to send back to the grid.
The energy storage project is expected to come online in 2029. SRP and Energy Dome will work with independent research nonprofit Electric Power Research Institute (EPRI), to monitor performance data from the project.
Google has also partnered with Energy Dome previously. In 2025, the company made a strategic investment in Energy Dome, details of potential projects were not given at the time.
