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Pinal Electrical Improvement Project
aps
Voltage: 69kV and 230kV
Siting: Completed Q4 2025
Estimated Construction: Q1 2026 – Q4 2027
Location: Arizona, Pinal County
Project Need
In April 2024, we announced the need to support growth in the Pinal County area and provide greater energy reliability in the community. New power lines will connect with existing and future electrical transmission infrastructure and include 69-kilovolt (69kV) and 230-kilovolt (230kV) facilities. We held in-person public open house meetings in April and November 2024, and our virtual open house launched in April 2024 to inform you about the project and request your input. As a result of environmental studies, and feedback from your communities and other stakeholders, we identified a “Selected Route” for the 69kV facilities and a “Preferred Route” for the 230kV facilities (see included map).
The 230kV route and facilities also required approval from the Arizona Corporation Commission (ACC). In July 2025, APS applied for a Certificate of Environmental Compatibility (CEC) with the ACC to construct and operate the 230kV facilities along the Preferred Route. The project was presented at a hearing before the Arizona Power Plant and Line Siting Committee (Siting Committee) in early September 2025. At the conclusion of the hearing, the Siting committee unanimously approved the CEC, including the power line corridor, for the project. In October 2025 the ACC reviewed the CEC and Siting Committee record and ultimately voted to approve the CEC for the project.
Below is an example of the types of structures we are proposing:
Timeline
69kV Power Lines
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2026 Q1-Q4
Rebuild existing Toltec-Arizola line along railroad and Toltec Buttes Road.
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2026 Q3-2027 Q2
Build new line from Arica Substation to Toltec Buttes Road.
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2027 Q2
Project energized and complete.
230kV Power Lines
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2026 Q1-2027 Q4
Project construction.
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2027 Q4
Project energized and complete.
Selected Routes Map
CEC Corridor Map (230kV)
CEC Timeline
July 2025 – An application for a Certificate of Environmental Compatibility (CEC) was filed at the ACC Docket Control. The docket number for this Project is L-00000D-25-0154-00247. A PDF copy of this CEC (CEC 247) application can be viewed within the Hearing Documents below.
September 2025 – The Arizona Power Plant and Transmission Line Siting Committee (Committee) held a hearing on this project beginning on September 8, 2025, at the Radisson Hotel Casa Grande, 777 North Pinal Avenue, Casa Grande, Arizona, 85122. Public comments were also taken that evening. Notification was sent to the public before the hearings to provide information for attendance in person or online. The Committee completed the evidentiary hearing on September 10, 2025, after voting unanimously to grant APS authorization to construct the 230kV power line for the PEIP Project pending approval from ACC Commissioners.
October 2025 – The Committee Chairman submitted CEC 247 to the ACC for consideration. ACC Commissioners can either grant the CEC as proposed, modify, or deny the CEC. At the Open Meeting on October 15, 2025, ACC Commissioners unanimously approved CEC 247 and issued Decision No. 81512, granting APS the authority to construct the Project.
For more information:
Project information phone line:(520) 482-2818
Project email: PinalProject@aps.com
Lupe Martinez Siting Consultant
Arizona Public Service
2121 West Cheryl Drive
Mail Station 3808
Phoenix, AZ 85021
Thank you for providing valuable input that helps us serve your area with safe and reliable energy now and into the future.
Watch the video below to learn more about the project.
Related materials
Hearing Documents
- Hearing Agenda
- Pre-Filing Conference Transcripts and Exhibits
- Updated CEC Application
- Notice of Hearing
- Procedural Order
- Route Tour Map and Itinerary
- Evidentiary Hearing Transcripts Day 1
- Evidentiary Hearing Transcripts Day 2
- Evidentiary Hearing Transcripts Day 3
- Notice of Filing CEC 247
- CEC 247
- ACC Decision No. 81512
How power gets to you
The illustration below shows how energy is delivered to you, including how it is generated, transmitted long distances and finally distributed to your homes and businesses.
