SunZia SunZia
Welcome To SunZia

The SunZia Project consists of two bi-directional extra-high voltage electric transmission lines and substations that will transport energy from Arizona and New Mexico to customers and markets across the Desert Southwest.  SunZia’s total transmission capacity has an approved rating from the Western Electricity Coordinating Council of 3,000 megawatts for two single-circuit 500 kV AC lines.  SunZia is solely an electric transmission project, and is not a power generation facility.  Click here for a more detailed description of the project.

The Bureau of Land Management (BLM), along with fourteen cooperating agencies, led the effort to comply with the National Environmental Policy Act (NEPA).   

On January 23, 2015, the BLM issued a Record of Decision (ROD) that approved SunZia’s application for a right-of-way across federally owned property.  The ROD concluded the six and half year effort to comply with NEPA.

SunZia is anticipated to be in-service by 2020.


Benefits of the SunZia Southwest Transmission Project:

icon2Provides an option to develop power generation resources, including renewable resources, located in Arizona and New Mexico that currently do not have nearby access to transmission service; and

icon2Delivers these generation resources to customers in western markets; and

icon2Increases reliability of the existing extra-high voltage transmission system in southern Arizona and southern New Mexico; and

icon2Greatly improves power transfer across the Desert Southwest electricity grid; and

icon2Generates jobs and revenues for state and local governments through property, state and local taxes paid by the SunZia Project and generation projects that will utilize SunZia’s new transmission capacity. Estimates on these economic benefits are detailed in an Economic Impact Assessment that was prepared by the University of Arizona and New Mexico State University.


Use the following links to learn more about:

icon16Environmental Impact Statements and the National Environmental Policy Act

icon16Bureau of Land Management and the SunZia Project

icon16Department of Interior and Electric Transmission Facilities & Energy Corridors

SunZia's Anchor Tenant Subscription Process

October 19, 2016

The SunZia Southwest Transmission Project completed selection of its anchor customer in August 2016 for the first 500 kV transmission facility and, subject to regulatory approval, is in the process of negotiating a binding precedent agreement that will lead to a binding transmission service agreement for the transmission capacity. To fulfill this transmission capacity request, all of the available merchant capacity of the first 500 kV transmission facility will be subscribed.

SunZia Study Area Map

Economic Impact