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Southline Transmission Project

About the Project

BLM New Mexico and the Western Area Power Administration are preparing an environmental impact statement (EIS) for the Southline Transmission Project.  The agencies released the draft EIS in April 2014 and are in the process of preparing the final EIS.  That document is expected to be completed in mid-2015.

Information on the project is available from Mark Mackiewicz,  BLM National Project Manager, at (435) 636-3616 or

Southline Transmission, LLC, proposes constructing, operating, and maintaining a high-voltage power line in two segments totaling approximately 360 miles.  The first segment would be a new double circuit 345-kilovolt line from a substation in Afton, New Mexico (south of Las Cruces), to a substation in Apache, Arizona (south of Willcox). This 225-mile segment would provide up to 1,000 megawatts of initial rated capacity.  The second segment would be an upgrading and rebuilding of about 130 miles of existing transmission lines between the Apache substation and the Saguaro substation, northwest of Tucson.  It would provide capacity for an additional 1,000 megawatts of electricity.

The line would cross Federal lands managed by the BLM and other agencies. It also would cross state and private lands.  BLM-New Mexico is preparing the EIS and is taking the lead in considering potential Federal land use plan amendments that the project may require.  Western, a power-marketing arm of the Department of Energy, is a co-lead in preparing the EIS.

Southline Transmission, LLC, is a subsidiary of Hunt Power, L.P., which develops and invests in entrepreneurial electric and gas utility opportunities.  It is part of a larger privately held group of entities managed by the Ray L. Hunt family.  Black Forest Partners, L.P., is the project manager for Southline Transmission, LLC.


Public Meeting Documents

Public Meeting and Hearing Presentation (5-8-14)

Poster Boards

Draft EIS and Draft Resource Management Plan Amendment

News Release

Volume 1

Volume 2

Volume 3

Volume 4

Public Meetings

Comment Form


Final Scoping Report, September 2012

News Release: Comment Period for the Southline Transmission Line Project extended to July 5, 2012

Southline Transmission Line Project Newsletter - April 2012

Public Scoping Meetings: May 8-17, 2012

News Release: BLM Begins Evaluation of the Proposed Southline Electrical Transmission Line in Southern New Mexico and Arizona

Map of Proposed Study Area

Notice of Intent

Comment Form

Scoping Meetings