Last week, Arizona Public Service (APS) announced that it would procure 850 megawatts (MW) of battery storage by 2025. APS, which is the largest utility in the southwestern state, also said it would add at least 100 MW of solar power to its grid by 2025.
According to Utility Dive, 450 MW of that battery storage will be deployed by 2021, with a total of 1200 megawatt-hours (MWh) of energy. The additional 400 MW will be built before 2025, but the duration of those batteries is not yet confirmed. APS’s statement notes that the new battery capacity will be built at existing solar plants.
The announcement is one of the largest made by a utility for battery storage. In July of last year, California’s PG&E signed similarly large deals with Tesla, Vistra/Dynegy, and Hummingbird Energy Storage. Invenergy and AES will work with APS to provide the batteries in Arizona.