Salt River Project (SRP) and Aypa Power today announced that Pediment Battery Energy Storage System (BESS), a 250-megawatt (MW)/ 1,000-megawatt-hour (MWh) project, located in the Elliot Road Technology Corridor in Mesa, Arizona, is now online and serving customers. With enough capacity to power up to 56,250 Valley homes for four hours, Pediment comes online as the Phoenix metropolitan area continues to rank among the fastest-growing regions in the country.
Pediment enters service as SRP prepares for sustained load growth driven by population increases and expanding commercial demand. The utility expects to more than double its system capacity over the next decade, with battery storage playing an increasingly central role in meeting peak demand and maintaining system reliability.
"The addition of new battery energy storage resources provides SRP with flexibility and capacity that helps us reliably serve our customers," said Bobby Olsen, SRP Associate General Manager and Chief Power System Executive. "This project is an important addition to SRP's energy portfolio and supports SRP's commitment to providing reliable, affordable and sustainable power as the Valley continues to experience record growth."
The Pediment project, which Aypa Power acquired from Eolian in 2024, is the first of two projects under contract with SRP and is a key addition to the utility's growing energy storage portfolio. In addition to Pediment, Aypa Power is developing another 250 MW / 2,000 MWh lithium-ion battery energy storage system under contract with SRP, which is expected to come online in December 2028.
Together, Aypa Power's projects represent 500 MW and 3,000 MWh of energy storage capacity on SRP's system, supporting the utility's ongoing investment in flexible, dispatchable resources to reliably serve its customers.
"The Pediment project reflects Aypa's disciplined approach to delivering reliable power infrastructure in high-growth markets," said Moe Hajabed, Chief Executive Officer at Aypa Power. "Located in one of the nation's leading data center corridors, our local projects are well-positioned to support growing demand from large-load customers, while strengthening overall grid reliability."
The project created over 200 construction jobs and is expected to deliver over $16 million in direct economic impact, including $14 million in property tax revenue to Maricopa County during its first 20 years of operation.
To maintain reliability and affordability for customers, SRP has a diverse energy mix that includes nuclear, hydroelectric, natural gas, coal, battery storage and renewable resources like solar, wind, biomass and geothermal. SRP has more than 3,000 MW of carbon-free resources available to serve customers, which include over 1,560 MW of solar and more than 1,570 MW of battery storage supporting its grid.
SRP is continuing to develop and deploy safe, cost-effective storage technology as part of the company's commitment to reducing carbon intensity (from 2005 levels) by 82 percent by 2035 and achieving net zero carbon emissions by 2050.
About Aypa Power
Aypa Power, a Blackstone portfolio company, develops, owns, and operates utility-scale energy storage and hybrid renewable energy projects across North America. With 42 projects currently in operation or under construction, and a development pipeline exceeding 22 gigawatts, Aypa delivers solutions that strengthen grid reliability, integrate renewable energy, and reduce dependence on fossil fuels. Aypa has been at the forefront of energy storage development since its first energy storage project came online in 2018. For more information, follow Aypa Power on LinkedIn or visit www.aypapower.com.
SRP is a community-based, not-for-profit public power utility and the largest electricity provider in the greater Phoenix metropolitan area, serving about 1.2 million customers. SRP provides water to about 2.5 million Valley residents, delivering 260 billion gallons of water (800,000 acre-feet) each year, and manages a 13,000-square-mile watershed that includes an extensive system of reservoirs, wells, irrigation laterals, and 131 miles of canals.
