Nogales Interconnection Project

The Nogales Interconnection Project is a proposed direct current interconnection (commonly known as a DC Tie) and associated electric facilities, which will allow for an asynchronous interconnection between the electric grid in southern Arizona and the electric grid in the northwest region of Mexico.

The Project will consist of the following components:

    1. a new, approximately 11-acre Gateway Substation where the DC Tie and other substation facilities will be located;

    2. a new, approximately 3-mile, 138-kilovolt (kV) alternating current (AC) transmission line between the existing UNS Electric, Inc. (UNSE) Valencia Substation and the new Gateway Substation, and;

    3. a new, approximately 2-mile, 230-kV AC transmission line extending south from the new Gateway Substation to the proposed international border crossing.

The Project will be constructed in two phases. The first phase of the Project will include DC Tie capacity of 150 MW with a planned in-service date of 2019. The second phase, to be constructed at a time that has not yet been determined, will expand the DC Tie capacity to 300 MW.

Nogales Frontier Operations, L.L.C. has commenced an open solicitation process for its capacity on the Nogales Interconnection Project. Interested parties can learn more about the Project's open solicitation process and how to participate by visiting

Fact Sheet (June 2017) English | Español
Project Map (June 2017) Download
FAQs (July 2017) English | Español
Federal Permitting Documents
Draft Environmental Assessment published by U.S. Department of Energy (July 2017) Download
U.S. Department of Energy Project Website Link
Presidential Permit Application (April 2016) Download
First Presidential Permit Application Amendment (January 2017) Download
Second Presidential Permit Application Amendment (May 2017) Download
Open House Meetings - June 2017
Informational Posters English | Español  
Flyer Download  
Public Notice English | Español  
Agency and Non-Governmental Organization Meeting – September 2015
Informational Posters English | Español  
Pre-NEPA Public Meeting – February 2015
Informational Posters English | Español  
Public Notice Download  
Petition for Declaratory Order (December 2016) Download
First Supplement to Petition for Declaratory Order (April 2017) Download
Second Supplement to Petition for Declaratory Order (June 2017) Download