Project overview

To continue to maintain system reliability and support new renewable energy development, Rocky Mountain Power plans to build a new single-circuit 500 kilovolt transmission line stretching approximately 395 miles from Aeolus, a new substation planned in prime wind generation country near Medicine Bow, Wyo., across Wyoming and into Utah, connecting to the existing Mona substation near Salt Lake City. This line could be upsized to a double-circuit 500 kilovolt line if warranted by third-party participation.

This proposed line segment is part of Energy Gateway South, a transmission expansion project that will connect with existing lines then move electricity to Utahand provide rating and reliability backup to Gateway West. The company will work to maximize benefit to customers, fulfill all appropriate siting and permitting requirements and 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 this transmission project will be posted on this Web site as the project progresses and details are developed. Please check back periodically. To contact us about this project, please call 801-220-4221 or e-mail ConstructionProjects@pacificorp.com. Be sure to specify the “Aeolus to Mona segment” in your inquiry.

(updated August 12, 2008 )