Arizona Public Service Doubles Down on Clean Energy, Invests Heavily in Battery Storage

by | Feb 21, 2019

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Customers of Arizona Public Service (APS) will soon power their homes and businesses with solar after sunset thanks to three major clean-energy initiatives.

APS will add battery storage to its existing fleet of solar power plants, build new solar plants with storage, and use storage to deliver cleaner energy to customers at times of peak energy usage. As a result, APS customers will be able to use solar energy even after the sun goes down.

“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,” said APS Chairman and CEO Don Brandt. “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 battery storage is a critical step on the path to reliable and affordable clean-energy solutions,” said Pat Graham, State Director, The Nature Conservancy in Arizona.

The initiatives announced recently will add 850 megawatts of battery storage and at least 100 megawatts of new solar generation by 2025, for a total of 950 megawatts of new clean-energy technology. This represents a major down payment on Arizona’s continued progress toward an energy future that is clean, reliable and affordable.

Energy Breakdown

Adding Storage to Existing Solar Plants

APS owns and operates large-scale solar plants throughout the state that will be upgraded with 200 megawatts of battery storage systems. A team led by Invenergy will install six of the new battery systems at solar plants in Maricopa County and Yuma to be in place by 2020. The remaining two upgrades will be completed by 2021.

Building New Solar Storage Plants

APS plans to build an additional 500 megawatts of solar storage and stand-alone battery storage by 2025. The first project will be a 100-megawatt solar-storage plant. APS expects to issue a request for proposals this summer. APS is already partnering with Tempe-based First Solar to build a first-of-its-kind solar-plus-storage project that will be one of the largest in the country when completed in 2021.

Delivering More Clean Energy When Needed

When solar production declines late in the afternoon and energy usage is still high, electricity companies need a reliable, flexible source of power to serve their customers. Traditionally, that source has been exclusively natural gas. Today’s announcement signals a new direction: APS will use 150 megawatts of solar-fueled battery storage to meet part of the demand when energy usage peaks.

The battery storage will come from two projects: a 100-megawatt battery provided by AES, and a 50-megawatt battery by Invenergy. Additional natural gas will come from a contract with Calpine for 463 megawatts of energy; however, instead of a traditional 20-year contract, the purchase agreement with Calpine is seven years, allowing APS the flexibility to take advantage of cleaner technologies in the future as they mature. This is part of a long-term clean-energy transition in which renewable and storage technologies will play an increasingly important role.

The 4th Annual Environmental Leader & Energy Manager Conference takes place May 13 – 15, 2019 in Denver. Learn more here.

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