Power Line Siting Projects

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Current and Completed Siting Projects

Here’s a look at the current siting projects, as well as some completed siting projects. As you’ll see, providing reliable and affordable energy across the state keeps Arizona powered.

Current Siting Projects

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Cotton Transmission Corridor

New 230 kilovolt (230kV) and 500 kilovolt (500kV) power lines are needed to improve electrical infrastructure and enhance reliability for current and future APS customers in the Western Maricopa County region.

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Bianco 230kV Transmission Line Siting Project

Learn about the Bianco 230kV Transmission Line Project.

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Pinal Electrical Improvement Project

To meet the expanding energy needs of more people and businesses throughout the Casa Grande area, we are looking to upgrade our system.

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Bagdad 230kV Transmission Line Project

To meet the expanding energy needs of more people and businesses throughout the Bagdad area, we are looking to upgrade our system.

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Merrill to Coolidge 69kV Transmission Line Project

The project will connect the Merrill and Coolidge substations to create a looped system improving reliability in the region.

Completed Siting Projects

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Runway 230kV

Improve reliability and increase the ability to serve continuing economic growth in the West Valley.

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Proving Ground Solar and Storage 500kV Interconnect

Interconnect the Proving Ground Solar and Storage power plant site to the Hoodoo Wash Switchyard.

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Biscuit Flats Project

Improve reliability and increase the ability to serve new growth in the North Phoenix area.

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North Gila to Orchard to Yucca

Improve electrical capacity and reliability in the Yuma area; may potentially accommodate the development of renewable energy projects in the region.

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Perryville to Valencia

Connect the Perryville Substation to the Valencia Substation, ensuring a reliable power source for the future.

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Sundance to Pinal Central

Increase electrical capacity and improve the reliability in the area.

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Three Rivers 230kV

Connect new power lines and substation into an existing 230kV transmission line.

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West Valley North

Increase electrical capacity and improve reliability in the area.

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Hoodoo Wash 500kV Interconnection

Interconnect the McFarland Solar power plant site to the Hoodoo Wash Switchyard

Mother reading to young son

West Valley Central 230kV Connection Project

Improve reliability and increase the ability to serve new growth in the West Valley area.

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West Valley South

Increase electrical capacity and improve reliability in the area.

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North Peoria 69kV

Build four new substations and interconnecting 69kV power lines.

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Westwing 230kV Interconnection Project

Interconnect separate customer proposed battery electrical storage projects to the existing Westwing Substation.

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Cyclone/Wildcat

Connect two new customer-driven projects into the existing 230kV transmission line.

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