Project overview
Energy use continues to steadily increase and electrical demand is fast approaching the limits of the existing transmission system.To address these issues,Rocky Mountain Power has plans to build a new transmission line stretching from the existing Sigurd substation in south central Utah, southwest to the existing Red Butte substation, then into Nevada. The line, as proposed, is approximately 155 miles of 345 kilovolt line from Sigurd to Red Butte in southwest Utah, and approximately 125 miles of 345 kilovolt line from Red Butte to the existing Crystalsubstation. Line voltages are subject to review and optimization based on the regional rating process or upsizing needs from equity partners or wholesale transmission customers who sign service agreements.

This proposed line segment is part of Energy Gateway South, a transmission expansion project that will stretch from resource areas including prime wind generation country near Glenrock, Wyo., across Wyoming, into Utah, and ultimately to the Desert Southwest. The company will fulfill all necessary permitting and siting requirements and work to minimize impacts to the community and local environment from project development, construction and maintenance.

Project timeline 

This line segment is in early planning changes, and will be brought in service as soon as possible. PacifiCorp is moving forward with design and permitting.

Additional information about the project

Additional information about Rocky Mountain Power's transmission project will be posted on this Web site as the project progresses and details are developed. Please check back throughout the timeframe of the project. To contact us about this project, please call 801-220-4221 or e-mail ConstructionProjects@pacificorp.com. Be sure to specify the “Sigurd to Red Butte to Crystalsegment” in your inquiry.

(updated August 12, 2008 )