Photo by Plus Power and Salt River Project.
Plus Power's Sierra Estrella battery energy storage project near Avondale, Arizona.

SRP to Add 340 MW Battery Storage with Two Energy Storage Projects

Oct. 31, 2022
Projects bring SRP’s battery storage commitment to over 800 MW by 2024.

Salt River Project announced signed contracts with Plus Power to bring online two grid-charged battery storage systems with a total combined output of 340 MW by early summer 2024. This is enough energy to power more than 76,000 average size residential homes over a four-hour period.

The first project, called Sierra Estrella, will be a 250-MW, four-hour battery storage system located in Avondale. The second, called Superstition, will be a 90-MW, four-hour battery storage system located in Gilbert.

SRP selected these projects from its most recent all-source request for proposals (RFP) process and both will be owned and operated by a subsidiary of Plus Power. SRP will have dispatch control of the storage systems, which means SRP will have the ability to decide at what point each day it will deploy the four-hour energy output from each system onto its grid. This will typically be done during peak energy demand periods, during the early evening timeframes when demand is high and renewable resources are not available.

Both battery systems will utilize Tesla lithium-ion technology, and Plus Power will design and build these projects to updated national codes and standards for Battery Energy Storage Systems, which incorporate lessons learned from incidents at other battery facilities. Additionally, Plus Power is engaged with both the Gilbert and Avondale Fire Departments, working to prepare a thorough Emergency Response Plan and to ensure that local first responders are directly engaged throughout project design, construction, operation, and training. 

 With these two new battery projects, SRP’s total commitment to battery storage will surpass 800 MW by 2024, which is enough to power more than 180,000 average size homes and represents over 10 percent of SRP’s anticipated peak-hour electricity demand from customers in 2024. This is among the largest utility-scale battery investments in the Western U.S.

Other soon-to-be developed projects include the Sonoran Energy Center, which will be the largest solar plus battery project in the state. SRP has also contracted for an additional utility-scale solar and battery storage project called the Storey Energy Center and will be adding a battery to the Saint Solar project site, both of which will be located near Coolidge. All three projects are scheduled to become operational in 2023.

In 2021, SRP placed into service a 25-MW battery storage facility at its Bolster Substation, which is adjacent to its Agua Fria Generating Station, located in Peoria. SRP also receives output from the Pinal Central Energy Center, a 20-MW solar plant paired with a 10-MW solar-battery system located in Pinal County.

SRP will continue to develop and deploy evolving storage technologies safely and cost-effectively as part of SRP's commitment to reducing carbon intensity (from 2005 levels) by more than 65 percent by 2035 and 90 percent by 2050.

SRP is a community-based, not-for-profit public power utility and the largest provider of electricity in the greater Phoenix metropolitan area, serving more than 1 million customers. SRP is also the metropolitan area’s largest supplier of water, delivering about 750,000 acre-feet annually to municipal, urban, and agricultural water users.

Plus Power develops, owns, and operates battery energy storage systems. With a more than 8,000 MW pipeline across nearly 25 states, Plus Power applies an intentional mindset to energy storage development by prioritizing local relationships, optimal siting considerations, and environmental stewardship. Plus Power is headquartered in Houston with offices across the country.

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