Southeast Power Link

See how new infrastructure will enhance electric system reliability and enable community growth in the Southeast Valley.

See how new infrastructure will enhance electric system reliability and enable community growth in the Southeast Valley. To contact SRP about this project, please call (602) 236-2872.

Meeting the needs of tomorrow

To meet the growing demand for energy in the Southeast Valley, SRP completed a public process to site 230-kilovolt (kV) power lines in southeast Mesa and northern Queen Creek.

Need and benefit

The Southeast Valley has already seen significant development, and local and SRP officials anticipate even more growth in the commercial, industrial and residential sectors. Additions to the power system will enhance reliability for current and future customers while supporting the area's growing economy.

Why start now?

  • By starting now, SRP can coordinate transmission line siting activities with other infrastructure projects planned for the region such as airport expansion and new SR24 freeway construction.
  • Economic growth is on the rise. Several large industrial customers are constructing new facilities or have expressed interest in locating operations in this region, which will increase energy demand.
  • For more than 100 years, SRP has focused on the big picture. With forward thinking and collaboration with customers, we can continue our efforts to keep affordable and reliable power flowing to the Valley and enable growth in the communities we serve.

Public input and routes

SRP conducted a robust public process which included extensive outreach activities. The process included 40 meetings with municipalities, agencies, landowners and other stakeholders. In addition, SRP held a public open house on May 14, 2018, to solicit input on potential route options from local residents and businesses.

Based on this feedback, SRP filed an application for a Certificate of Environmental Compatibility (CEC) with the Arizona Corporation Commission (ACC) on Aug. 1, 2018, for the project components below.

  • The project includes 7 miles of new overhead 230-kilovolt (kV) power lines, which will run along the approved route shown in green on the map below. A half-mile of the route will be located in Queen Creek and the remainder in Mesa.
  • The project also includes a 230/69 kV receiving station, which will be located somewhere within the orange area shown on the map.

Click on map to open larger PDF version.

Final approval

On Nov. 7, 2018, the Arizona Corporation Commission unanimously approved a Certificate of Environmental Compatibility for the project. The approval is the final step of the application process and enables SRP to move forward with land acquisition, project design and construction.

Power system overview

SRP relies on a vast network of critical components such as generating stations, transmission lines and substations to deliver energy to customers in a way that is reliable, affordable and aligns with our 2035 sustainability goals. The diagram below illustrates this process:

Transmission diagram

The type of transmission pole proposed for the Southeast Power Link project is approximately 100-150 feet tall with a diameter of 4–8 feet. The chart below helps put this size in perspective compared to other types of transmission poles for different system voltage levels. Poles as tall as 170 feet may be needed for unique cases such as freeway crossings.

FAA height considerations

Given the proximity of the project to the Phoenix-Mesa Gateway Airport, SRP submitted an application to the Federal Aviation Administration (FAA) to obtain a review of the proposed route. On Sept. 6, 2018, the FAA issued a “Does Not Exceed” determination for the project. This determination is the final step in the FAA’s review and confirms that the structures do not exceed any obstruction standards, and do not have any substantial adverse physical or electromagnetic interference effect on navigable airspace or navigation facilities.

Sample 230 kV line

230kV line

This photo shows a typical 230 kV line with a single circuit of 69 kV underbuilt on the poles. The poles in this example were constructed near an existing greenbelt and are approximately 130 feet tall.

Sample 230 kV substation

Aerial view of 230 kV substation

This is an aerial view of the Knox substation, located in an industrial corridor. SRP has dozens of 230 kV substations in Valley commercial areas similar to pictured example. This is the type of facility planned for the Southeast Power Link project, referenced as RS-31 on the map.