Projects and Resource Planning
Transmission Line Projects
Nogales Tap to Kantor Upgrade
The proposed project includes upgrading a 27.5-mile segment of UES’ existing 138-kilovolt (kV) transmission line that serves customers in Santa Cruz County and building a new substation west of Nogales.
Golden Valley 230 kV
UniSource is developing plans for a double-circuit 230kV transmission line from the Harris Substation to the new Mineral Park Substation to improve reliability, replace aged equipment, and accommodate a projected 5 to 35 megawatt increase in load over the next decade in the north Golden Valley area of Mohave County.
Safe, Reliable Power for the Future
UniSource Energy Services (UES) 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, UES and its sister company, Tucson Electric Power ( 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.
UniSource filed its 2019 Preliminary IRP with the Arizona Corporation Commission on August 1, 2019.
UNS Electric 2019 Preliminary Integrated Resource Plan – PDF 2 MB
UniSource filed its 2017 UNSE IRP with the Arizona Corporation Commission on April 3, 2017.
UES 2017 Integrated Resource Plan – PDF 5 MB