US-based electric utility Arizona Public Service (APS) is planning to add battery storage to its fleet of solarpower plants, as well as build solar facilities with storage.

As part of the initiative, the company plans to add 850MW of battery storage and at least 100MW of new solar generation by 2025.

The utility firm intends to supply the stored solarpower to its customers during peak energy use periods.

APS chairman and CEO Don Brandt said: “Arizona is already a national leader in solar energy. The challenge is, no one has figured out how to stop the sun from setting at night.

“As storage technology improves and declines in cost, we will increasingly be able to store the power of the sun cost-effectively to deliver when our customers need it.”

“As storage technology improves and declines in cost, we will increasingly be able to store the power of the sun cost-effectively to deliver when our customers need it.”

Large-scale solar plants owned by APS across the state will be upgraded with 200MW of battery storage systems. A team from Invenergy, an Illinois-based energy company will install six new battery systems at solar plants in Maricopa County and Yuma by 2020, with the rest due to be complete by 2021.

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Additionally, APS is planning to build 500MW of solar storage and standalone battery storage by 2025. As part of the initiative, the first project will be a 100MW solar-storage plant.

The initiative is reported to be part of the company’s long-term clean-energy transition objective. Under this, renewable and storage technologies will play an increasingly important role.