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Central Phoenix Line Upgrade
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We are upgrading a critical underground transmission line in central Phoenix – the “backbone” of the metro Phoenix 230kV transmission system. This upgrade supports reliability for customers as it replaces a line that is reaching the end of its design life. This project also expands the capacity of the line to support customers’ growing energy needs.
The first phase of this upgrade began serving customers in summer 2024. Additional segments of this line will be upgraded in the coming years. To see how phase one of the line was safely upgraded, watch this video.
Project Phases:
- Phase 1: Lincoln Street South Substation to Country Club Substation:
- Completed 2024
- Phase 2: Country Club Substation to Meadowbrook Substation:
- Preparations for this phase of the upgrade are scheduled to begin in fall 2025 with work taking place at select manholes and at the Meadowbrook Substation. If work is scheduled to take place near you, you will receive a notification prior to construction.
- Additional construction is scheduled to start in late 2026 and will take place in various locations along the project route through spring 2027.
- Phase 3: Meadowbrook Substation to Sunnyslope Substation:
- Upgrade planned for fall 2027-spring 2028
- Phase 4: Country Club Substation to Grand Terminal:
- Expected in 2030
This page will be updated during each phase of the project.
Project Map
Community Updates:
If work is scheduled to take place near you, you will receive a notification prior to construction. Message boards will also be placed in advance of work when there are significant restrictions or road closures.
Outreach Documents:
September 2025 Postcard
September 2023 Coronado Rd. between 7th and 10th Street (Spanish)
September 2023 9th Street and Roosevelt Street (Spanish)
September 2023 9th Street and Filmore Street (Spanish)
Frequently Asked Questions
The underground cables and pipeline will be accessed through various manholes along the project route. Contractor crews and equipment will be located at various manholes to remove or feed the cable through. There will be traffic control in impacted areas, including street closures in some cases. The work will move between sites, typically staying in one location for a few weeks at a time.
Photo courtesy of Ferreira UTEC
