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 across its entire length 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 several cooperating agencies, is leading the effort to comply with the National Environmental Policy Act (NEPA).   

On June 14, 2013 the BLM released the SunZia Final Environmental Impact Statement and Proposed Resource Management Plan Amendments. 

SunZia is anticipated to be in-service by 2018.        


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 along SunZia’s alignment and 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 wage income in addition to revenues for state and local governments through property, state and local taxes paid by the SunZia Project and generation projects that may utilize SunZia’s new transmission capacity. An Economic Impact Assessment 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

Defense Secretary Chuck Hagel Offers a Path Forward for the SunZia Project

July 2014

Defense Secretary Chuck Hagel sent a letter to Interior Secretary Sally Jewell on May 27, 2014 to acknowledge SunZia's acceptance of certain mitigation commitments that will help to resolve the mission conflicts previously identified by White Sands Missile Range in New Mexico.  

Additionally, Secretary Hagel sought further commitment from SunZia to bury up to three segments, totaling five miles, of the transmission lines. These segments have been identified along the BLM's Preferred Alternative Route that is approximately 30 miles north of White Sands Missile Range.  The BLM is performing an Environmental Assessment to evaluate the underground segments.

View Secretary Hagel's letter.

View BLM's website for updates on the Environmental Assessment.

SunZia Study Area Map

Economic Impact