WILSONVILLE, Ore.--(BUSINESS WIRE)-- Salt River Project (SRP), a not-for-profit public power utility serving the greater Phoenix metropolitan area, and ESS (NYSE:GWH), a leading manufacturer of iron flow long-duration energy storage (LDES) systems, today announced an agreement to add Project New Horizon, a five megawatt (MW), 50 megawatt-hour (MWh) battery system, to the grid. The pilot project will be installed at SRP's Copper Crossing Energy and Research Center in Florence, Arizona and sell capacity to SRP under a ten-year energy storage agreement.

The ESS Iron Flow Battery (IFB) project will be part of SRP's effort to evaluate emerging, non-lithium ion LDES technologies and support SRP's reliability and sustainability goals. The system, which will utilize ESS' Energy Base technology, will store enough energy to power 1,125 average-size homes for 10 hours. This project is the result of an RFP issued by SRP in 2024 for LDES pilots.

SRP is working to at least double the number of generating resources on its power system in the next 10 years to meet increasing energy demand in the Phoenix metropolitan area. SRP has nearly 1,300 MW of energy storage currently supporting its grid, which includes 1,100 MW of battery storage— spanning eight facilities— and 200 MW of pumped hydro storage.

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