Segment C - Mona to Oquirrh

Project Overview

Mona to Oquirrh

Within the overall Energy Gateway expansion area, Northern Utah represents the fastest growing area in Utah and one of the major growth areas within the region. New transmission lines and substations are needed to provide additional capacity to serve the growing electrical demand of customers, to improve reliability and operational flexibility of the electrical system and to provide access to existing and future generation resources.

We are committed to providing safe reliable and cost-effective power to customers. As part of the Energy Gateway expansion project, we constructed a new high-voltage transmission line, one new substation, planned one new future substation and expanded an existing substation in Utah. This project originates at the Clover Substation near Mona in Juab County and terminates at the Oquirrh Substation near South Jordan in Salt Lake County. A single-circuit 500/345-kilovolt line runs north to the site of the future Limber Substation in Tooele County and then runs east to the Oquirrh Substation as a double circuit 345-kilovolt line. When the Limber Substation is constructed at some point in the future, the voltage is stepped down to 345-kilovolt to the Oquirrh Substation and the Mona to Limber section will be operated at 500-kilovolt. Also planned as part of this project but for future construction is a double-circuit 345-kilovolt line connecting the future Limber Substation with the Terminal Substation in Salt Lake City, Utah.

Project Timeline

  • Public Scoping – October 2007
  • Environmental Impact Study process – October 2007-February 2011
  • Informational meetings – August 2007 – project completion
  • Permitting and obtaining rights of way – August 2009-2011
  • Construction – mid-2011 - May 2013
  • Completion of Mona to Oquirrh project – May 2013

Additional Information About the Project

The Bureau of Land Management (BLM) completed the Environmental Impact Statement (EIS) process for the Mona to Oquirrh project and notification was published Feb. 10, 2011 in the Federal Register. On Feb. 4, 2011 the BLM signed the Record of Decision and granted the easement for the right of way across federal lands. Visit the BLM Web site for more information on this process.

In order to determine a final route for this 100-mile project, more than 450 miles of possible routes were studied. This analysis considered the extensive public input received during the permitting process. It also considered environmentally sensitive areas, wildlife habitat, landowner requests, local business needs, customer growth, and project needs for construction and ongoing maintenance, along with the cost impact to customers. Multiple route adjustments were driven by these considerations and led to the BLM determination of the environmentally preferred route as well as adjustments through private lands. Also, an additional 46-mile segment for later construction between the Limber substation and the Terminal substation was studied and included the EIS process.

Conditional use permits for the project were obtained in all applicable cities and counties. The certificate of public convenience and necessity was issued by the Utah Public Service Commission.

Public Participation

Public input and involvement is an important part of the transmission line development process. Project materials and newsletters were sent to nearly 10,000 landowners and interested parties. Also, our company and the BLM held six open house meetings in June 2009 as part of the environmental review process for the project. Those meetings were held in Tooele, Nephi, West Jordan and Magna, Utah. Meetings also were held in August 2009 with various interested parties in Tooele for further input on routing issues. Additional meetings have been held throughout the process with local communities, federal and state agencies as well as with interested third parties.

The following materials were developed for use during the project: fact sheet (PDF), project map (PDF) and photos (image 1, image 2, image 3, image 4, image 5).

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


(Updated December 15, 2016)