Cottonwood Substation

TEP plans to build a new 138 kilovolt (kV) substation and upgrade existing facilities in the City of Tucson to strengthen electric reliability for customers and meet growing electric demand in southwest Tucson.

Through long-term planning studies, the company has determined that new infrastructure will be required to support residential and commercial development in the area. TEP will install these improvements in two phases:

Phase 1 (Spring 2019): TEP will install a temporary 40 megavolt ampere (MVA) mobile substation, new power poles and other infrastructure near South Ajo Way and South Cottonwood Lane on land owned by the City of Tucson and operated by Pima County Regional Flood Control District. This work is scheduled for completion by the end of May 2019.

In late April, construction will require the Santa Cruz River Path north of Ajo to detour along Cottonwood, then turn east to rejoin the regular path. See the map below for more details.

Phase 2 (2020-2021): TEP will conduct a detailed study within the area to identify potential sites for a new, permanent substation, power poles and other infrastructure. Prior to construction of the permanent substation, which is expected to begin in May 2020, TEP must hold a public meeting and obtain a special exception land use permit from the City of Tucson. More information will be provided to area residents in the near future.

The Cottonwood Substation will connect to TEP’s existing 138 kV transmission system and help improve reliability for customers in the area by reducing the stress placed on existing circuits currently supported by the Midvale, Santa Cruz and Shannon substations. These upgrades also are designed to support nearby commercial development.

If you have any questions, please contact TEP Land Resources Transmission and Distribution Supervisor Renee Darling at rdarling@tep.com or (520) 884-3642.