Nogales Tap to Kantor Upgrade

New and improved transmission resources for continued reliability.

UES has proposed upgrading and building new transmission and substation facilities that will help to improve electric reliability for customers.

The Nogales Tap to Kantor Upgrade is being planned in collaboration with the Nogales Interconnection Project. The projects will support the reliability of the electric system by providing bi-directional power flow and voltage support, and emergency assistance for the electric system both north and south of the U.S.-Mexico border.

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. Expected completion date to be determined — before Fall of 2027.

In September 2017, the Arizona Power Plant and Transmission Line Siting Committee voted unanimously to grant UNSE’s application for a Certificate of Environmental Compatibility (CEC). The Arizona Corporation Commission reviewed and approved the CEC in November 2017.

For project related inquiries, please send an email to or call (520) 917-6623.

Public Meeting Documents

Permitting Documents


Additional documents