Electric Transmission

AzGT line crew places a pole for the new Bagdad Interconnect that increases reliability for Mohave Electric Cooperative.

AEPCO transmits wholesale electric power from Apache Generating Station in Cochise, Arizona, to our six Member distribution co-ops, which serve members in Arizona, California, and New Mexico. AEPCO operates and maintains:

  • 841 miles of transmission line owned all or in part by AEPCO
  • 33 substations reaching out from Apache Station across Arizona to the northwestern corner of the state
  • 30 telecommunications towers and an extensive fiber network used to communicate between AEPCO operations centers and substations, and Member cooperatives and customers

It takes a solid, reliable system to transmit power from our plant to our Member distribution electric co-ops, and on to their 420,000 member-consumers at the end of the line.

We continue to boost system reliability and service by partnering with other utilities on transmission projects.

  • We interconnected the Valencia Substation in southwest Tucson with the Central Arizona Water Conservation District (CAWCD) and its Centerl Arizona Project (CAP), which power pumps that deliver water to southern Arizona. The new 2.7-mile transmission line and Valencia Substation upgrades provide mutual backup for AEPCO and CAP.
  • We are developing an interconnect between AEPCO’s Kartchner Substation and the Tucson Electric Power (TEP) substation at the Fort Huachuca U.S. Army Post. Scheduled for completion in 2021, the cost of the 5-mile transmission line and substation would be shared between TEP, Fort Huachuca and AEPCO.
  • We worked with Arizona Public Service (APS) on a new 1-mile transmission line near Bagdad, Arizona, connecting the Bagdad Substation to an APS line. This provides backup for APS’s Bagdad townsite and Mohave Electric Cooperative loads in the Wikieup area.
  • We are working with APS on another project north of Tombstone, Arizona, that will include an interconnect between Sulphur Springs Valley Electric Cooperative and APS in the Hereford/Palominas area. This is projected to be in service in 2021.
We do extensive maintenance and perform upgrades to enhance system reliability whenever and wherever possible. Here, crews replace a component of one of the wooden structures that supports the Apache – Hayden 115 kV line, in a remote area east of San Manuel, Arizona.