March 7, 2019: US power utility Arizona Public Service announced three major clean-energy initiatives totalling 850MW on February 21 that will deliver peak shifting services and increase the company’s renewable energy mix.
The storage capacity will be delivered by 2025 through seven projects at existing solar power plants, new solar plus storage projects and via power purchase agreements.
APS will add a total of 200MW of storage at existing solar plants in Maricopa County (141MW/423MWh with Invenergy) next year and Pinal County and Yavapai County (combined 59MW/177MWh) a year later.
Plans also include building an additional 500MW of storage by 2025 at an undisclosed location, with the initial request for proposals for the first 100MW due to be issued this summer.
The first power purchase agreement is a 20 year agreement between the utility and AES Corporation to provide a 100MW, four hour duration battery for peaking capacity and operational flexibility services in Sun City.
The second in El Mirage is a 50MW/200MWh battery to be delivered by energy storage firm Invenergy. Both are due to be completed by 2021.
Andrés Gluski, AES president and chief executive officer, said: “Arizona is realizing its great solar potential. Energy storage can replace traditional peaking thermal generation to meet peak power demands while reducing greenhouse gas emissions and maximizing the use of renewable energy.”