Arizona Public Service (APS) will install two battery storage systems in rural Punkin Center, Arizona, making it one of the first electricity companies in the nation to use batteries in place of traditional infrastructure. The two 4-megawatt-hour (MWh) Advancion® batteries are made by AES Energy Storage. Construction on the project will begin in fall 2017.

Currently, APS is using batteries to store excess solar power for use after the sun goes down, for storing energy to use at peak times and for other functions such as voltage support . This project is unique in that the primary function of the battery is basic grid operation. To reliably serve new customers in the growing community of Punkin Center, APS was faced with rebuilding 20 miles of power lines over rough terrain. A review of the community’s needs showed that adding battery storage would provide these additional benefits at a similar cost to rebuilding the lines.

The batteries will increase power reliability to serve the community of 600 residents, located roughly 90 minutes northeast of downtown Phoenix.


Lithium-ion Battery


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