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Reliability Upgrades
Construction Projects
We continuously work to improve our systems and service throughout Arizona to support reliability for our customers. We are committed to keeping customers, communities and stakeholders informed about upcoming projects around the state. Learn more about our future-focused projects that support reliable service for customers.
Central Phoenix Line Upgrade
Oak Creek to McGuireville 69kV Project
To support reliability, we plan to build a new 69kV power line to connect the Oak Creek substation (near Highway 179 and Jacks Canyon Road) and McGuireville substation (near Cornville Road and Restoration Loop). Construction is expected to begin Fall 2025. View the project website.
Walker Road Upgrade
Natural Gas Projects
Natural gas is an essential resource during the clean energy transition – and an important partner to the large quantity of renewables and energy storage we’re adding to our system. In late June 2023, we issued a competitive request for proposals (RFP) seeking additional megawatts (MW) of incremental natural gas capacity at our Redhawk and Sundance locations (see below). We expect to add five times as much renewable energy technology in the same time period.
Natural gas supports the reliable service our customers count on, providing much-needed energy during late-afternoon and evening hours when customers use it most. Through our competitive procurement process, we’re evaluating these projects and additional resources to support Arizona’s growing energy demand and protect reliability and affordability for customers.
- Redhawk Project - We propose to build eight new natural gas units at our existing Redhawk Power Plant southwest of Phoenix to support reliable service for customers. The units will add approximately 397 MW of capacity to the energy grid by 2028 - enough to serve 63,520 Arizona homes. View the Redhawk project website.
- Sundance Project - The Sundance Power Plant, located 55 miles southeast of Phoenix near Coolidge, is a key component of our energy infrastructure. We propose to add two additional natural gas units at Sundance – adding 90 MW, enough energy to serve an additional 14,400 Arizona homes. We expect construction to begin in late 2024, with the two units in service spring 2026. View the Sundance project website.
- West Phoenix Upgrade We made a minor upgrade to one of the existing units at the West Phoenix Power Plant, to improve the efficiency of the unit. This upgrade helps us maintain reliable service, especially during the peak summer months.
Downtown Phoenix Substation Projects
Several interconnected substation projects and related powerline upgrades in Phoenix support reliable service in the bustling downtown.
- Evans Churchill Substation - Located at 7th Street and Roosevelt Street, the distinctive “Roosevelt Row” substation upgrade was completed in 2022. We continue to work on powerline upgrades that serve critical customer projects in the downtown. Those powerline upgrades are expected to be completed in 2024.
- Garfield Substation - Garfield Substation is located near 2nd Street, south of Roosevelt to Garfield. The demolition and rebuild of Garfield Substation will follow the energization of the new Evans Churchill network. The new substation design includes a multi-use component on Roosevelt Street, which will include offices for Roosevelt Row and art gallery space. The design also includes active pedestrian space, public art and shade. The engineering, permitting and neighborhood outreach will take place throughout 2023 and 2024. We expect this project to be complete in early 2026.
- Grant Street Substation - This project will expand the footprint for the three Lincoln Street substations at 4th Avenue and Lincoln Street. Construction is scheduled to start in 2024. View project website
Line Siting Projects
