Segment F - Aeolus to Mona

Project Overview 

As part of PacifiCorp’s Energy Gateway Transmission Expansion, the company is planning to build a 500 kV high-voltage transmission line, known as Gateway South (Segment F), extending approximately 400 miles from the planned Aeolus substation in southeastern Wyoming into the Clover substation near Mona, Utah.
This proposed line segment is part of the Gateway South portion of PacifiCorp's transmission expansion project. 

Project Timeline 

  • Public Scoping – Early 2011
  • Informational Meetings – Early 2011
  • Environmental Impact Statement – December 2008 - 2016
  • State and local permitting and obtaining rights of way – To be determined
  • Estimated line in service for customers – 2021 - 2024

Additional Information About the Project

Information about this transmission project, including a project map (PDF) and a landowner parcel map are posted on this website and will be updated as the project progresses and details are developed. Please check back periodically for additional information.

To contact us about this project, please call 801-220-4221 or email Please be sure to include the project name – "Aeolus to Mona project" – in your inquiry.

On July 24, 2013, the BLM announced its Preliminary Agency Preferred Route for the project. The map is available on the BLM website (PDF).

On February 21, 2014, the Bureau of Land Management (BLM) published its Notice of Availability of the Draft Environmental Impact Statement (DEIS) for the Gateway South project. The DEIS document is available on the BLM website along with the BLM public open house meetings. In addition, links to the shape files and Google Earth mapping for the routes analyzed in the DEIS are available below. Comments on the draft Environmental Impact Statement were submitted directly to BLM during the official comment period that closed May 22, 2014.

The Bureau of Land Management is now preparing the Final Environmental Impact Statement and currently plans to publish the document in October 2015.

Download Gateway South shape files

Download Gateway South Google Earth files

Next Steps

The Record of Decision and right-of-way grant contain many conditions and stipulations that must be met and accepted before the project can move to construction. The company will initiate a review of these conditions and begin the work necessary to meet these requirements. The company will continue to meet regularly with the Bureau of Land Management to review progress.

There is more work to be done to obtain state and local permits, as well as obtaining rights of way. The company will continue evaluating the timing of next steps in the project to best meet our customer and system needs.

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