Projects and Resource Planning
Rosemont 138 kV
Project contingent on mine approval.
The Arizona Corporation Commission (ACC) voted unanimously in May 2012 to allow construction of a new transmission line to serve the proposed Rosemont Copper mine in the Santa Rita Mountains southeast of Tucson.
TEP has made plans for construction of a new 13-mile, 138-kilovolt (kV) transmission line that would link the proposed Toro Switchyard near Green Valley to the site of the proposed Rosemont Copper mine in the Santa Rita Mountains. Construction would begin only after the Rosemont Copper facility receives all necessary permits to develop and operate the mine. For information on the status of the Rosemont permitting process, please visit http://rosemonteis.us.
Transmission lines are necessary to allow energy to flow from power plants to major substations.
TEP is committed to strengthening the transmission system, which is the backbone of our electrical grid, and allows customers to power their homes and businesses.
Safe, Reliable Power for the Future
Tucson Electric Power (TEP) is diversifying its portfolio of resources in response to new environmental regulations, emerging technology and changes in our customers’ energy needs. To inform regulators, customers and other interested stakeholders about these and other changes, TEP and its sister company, UniSource Energy Services (UES), have developed Integrated Resource Plans (IRPs). These IRPs present the detailed assumptions and analyses used to develop the companies’ strategies for serving customers’ long-term energy needs.
TEP filed its 2017 IRP with the Arizona Corporation Commission on April 3, 2017. This IRP covers the period from 2017 through 2032.
TEP 2017 Integrated Resource Plan – PDF 10 MB
New substation for continued reliability
TEP is proposing to build a new 138-kilovolt (kV) substation at the northwest corner of North Harrison Road and East Speedway Boulevard that will help ensure continued reliability and satisfy customers' future energy needs.
The proposed Harrison Substation is a priority for TEP to ensure capacity and reliability to current and future residential and commercial customers on Tucson's east side. Three existing substations that serve the area are operating at or above capacity.
The proposed substation will connect to the existing 138-kV transmission line located along the south side of East Speedway Boulevard. The substation would improve electric reliability and reduce the frequency and duration of electrical service outages. The substation also would accommodate anticipated future growth in the area. The need for a substation in the area has been identified in long-term transmission plans filed with the Arizona Corporation Commission.
If you have any questions regarding this project, please call (520) 884-3642.