Three Peaks to Purgatory Flat transmission line project

About the project 

The Three Peaks to Purgatory 345 kV line is needed to maintain a strong and reliable electric system for southern Utah. Rapid population growth and economic development in the region have led to increased demand for electricity, and that demand is expected to continue rising in the years ahead. At the same time, the energy landscape is evolving, with new generation resources being developed across the region and throughout PacifiCorp’s service area. The new transmission line will help move electricity efficiently across the grid, providing greater flexibility to serve customers and connect a diverse mix of energy resources to where they are needed most.

Without additional transmission capacity, an outage on the existing system could make it difficult to meet reliability standards and maintain the level of service customers expect. By strengthening the transmission network, this project will enhance system resilience, improve operational flexibility, and help support the reliable delivery of electricity for communities across southern Utah.

• Voltage: 345 kV
• Type of Structures: Steel transmission towers, H-frames and single poles
• End Points: Three Peaks substation (Cedar City) and Purgatory Flat substation (Washington)
• Length: Approximately 54 miles
• Right of Way: 80-130 feet
• Anticipated in-service date: 2033

Project benefits

• Reliability 
• Economic development
• Increased resilience from extreme event or wildfire

Project map

The project is in the planning stages. PacifiCorp is conducting a routing study and meeting with local agencies to gather information in efforts to identify a suitable route. Route selection takes into consideration impact on existing land uses, biological and environmental factors, known resource constraints and feasibility. Considering these factors, certain route options have been eliminated from further consideration.

This is a preliminary map and is subject to change.

Public outreach & open house meetings

PacifiCorp values insight from the public and is committed to keeping the public informed as the project develops.

Please join us at our public open house meetings. The following in-person open houses will take place from 5:00 p.m. to 7:00 p.m.

Tuesday, October 6, 2026

Festival Hall Conference Center
96 North Main Street, Suite 100
Cedar City, UT 84720

Wednesday, October 7, 2026

Fire Station 47
730 North Main Street
Leeds, UT 84746

Thursday, October 8, 2026

Heritage Hall
500 North Main Street
Washington, UT 84780

A virtual option will also be hosted Wednesday, October 14, 2026, from 12 p.m. to 1 p.m. 

Virtual Open House
Register at ThreePeakstoPurgatory.com

Anticipated project timeline