Sonoran Substation to Wilmot Energy Center

Sonoran Substation to Wilmot Energy Center 138 Kilovolt Transmission Line

Tucson Electric Power (TEP) has proposed building a new 138-kilovolt (kV) substation, transmission lines and a switchyard south of Tucson to strengthen electric reliability for customers, meet future energy needs in the area and support what will become TEP’s largest local community-scale solar array and battery storage system.

The planned 100-megawatt (MW) solar array and accompanying 30 MW energy storage system located at the Wilmot Energy Center (WEC) will be owned and operated by an affiliate of NextEra Energy Resources. The systems are expected to be in service by the end of 2020 and will provide enough renewable power to serve up to 21,000 homes annually.

 In spring 2018, TEP transmission planners reduced the scale of the project because transmission studies indicated that existing and planned infrastructure would support the new facilities and that new connections to TEP’s South Loop Substation in Sahuarita were unnecessary. The project name was then changed to the “Sonoran Substation to Wilmot Energy Center” from “Sonoran Substation to Wilmot Switchyard to South Loop” transmission line project.

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