Arizona is home base for ESS. Here is the grid it has worked since 1978.
Salt River Project (SRP), Arizona Public Service (APS)
Arizona's electricity comes primarily from natural gas, which supplied roughly 47 percent of in-state generation in 2024, followed by nuclear at about 28 percent from the Palo Verde Generating Station, one of the largest nuclear plants in the United States. Renewables, led by solar, provided approximately 16 percent, and coal has fallen to under 10 percent as older units retire.
Extreme summer heat drives high peak demand while utilities plan for large new loads from data centers and manufacturing; APS has projected that most of its energy-need growth through 2038 will come from data centers and large industrial customers. Meeting that growth requires new generation, expanded transmission, and continued solar and battery storage interconnection. Arizona sits in the Western Interconnection with no traditional ISO, so utilities coordinate reliability as regional balancing authorities and are moving into Western energy markets.
Shown as regional context, the major electric utilities and grid organizations operating in Arizona. ESS builds substations and installs EHV apparatus across the western grid and has mobilized wherever the work is since 1978.
Tell us the voltage class, the site, and the timeline. ESS mobilizes across the West.
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