The state of California has targeted 2045 as a deadline to achieve carbon neutrality, making energy storage one of the keys to this ambition’s successful execution.

To test the viability of battery storage as a secure and resilient way to store and effectively manage energy, Sumitomo Electric (SEI) installed a redox flow battery system in San Diego – the largest of its kind in the US. Arup undertook a detailed design review of the proposed battery system, prepared design documentation, and assisted with start-up and commissioning.  

Arup undertook a design review of this 2MW battery storage concept system, the first of its kind for the US, and provided technical expertise for installation, start-up and commissioning. With this being the first large flow battery system in the US, we ensured the proposed system and specifications met California code compliance, and installed it on a concrete pad 11,348ft². Our mechanical engineering specialists advised on the grid connection while our geotechnical experts ensured seismic and ground stability.  

This is the first flow battery facility installed in the United States and the largest of its kind. It is now successfully connected to San Diego Gas & Electric’s distribution system, allowing more than 1,000 homes to benefit from stored, low-carbon energy, helping California towards its 2045 target.

Partners & collaborators

San Diego Gas & Electric (SDG&E)