What is the project timeline?
Construction on the new units has begun and is planned to be completed by summer 2019. Removal of the old units would begin in 2020.
Why upgrade the Ocotillo plant?
The Ocotillo plant is critical to maintain service reliability in the Phoenix metro area because of its location. We can also improve an existing plant without changing its overall footprint. The planned new units are also more responsive – they can start up and begin delivering electricity in less than six minutes and reach full power in 10 minutes. The old units can take six hours or more just to start.
What will be the environmental benefits?
Replacing the obsolete steam generators with much newer, proven, cleaner technology will greatly improve the plant’s efficiency. The new units will decrease the plant's water-use and emission rates. They will also improve the plant's overall noise conditions.
How tall will the new structures be?
The plant currently has four 178-foot stacks, while the upgraded plant is planned to have five stacks about half as tall. This would significantly reduce the plant’s visibility from several locations.
What economic benefits will the project provide?
It will create local jobs – we expect the project to require an average of more than 100 jobs during construction. Total property taxes for the upgraded plant are expected to increase to about $8 million by the fifth year of operation. APS currently pays about $600,000 in total property taxes for Ocotillo.
How can I get involved in the project?
APS is committed to a transparent public process. In addition regularly providing updates on this page, we held a public open house to provide information and take comment, and we have participated in public forums for government agencies that provide oversight of various project components.
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about the Ocotillo modernization project.