Energy Gateway

PacifiCorp's Energy Gateway Transmission Expansion Program represents plans to build over 2,300 miles of new high-voltage transmission lines, with an estimated cost of over $8 billion, primarily in Wyoming, Utah, Idaho and Oregon. The over $8 billion estimated cost includes:

• The 30-mile, 230 kV transmission line between the Wallula substation in Washington and Bonneville Power Administration’s McNary Substation near Umatilla, Oregon, placed in-service 2019;
• The 135-mile, 345-kV transmission line between the Terminal substation near the Salt Lake City Airport and the Populus substation in Downey, Idaho, placed in-service in 2010;
• The 100-mile, 345/500-kV transmission line between the Mona substation in central Utah and the Oquirrh substation in the Salt Lake Valley, placed in-service in 2013;
• The 170-mile, 345-kV transmission line between the Sigurd substation in central Utah and the Red Butte substation in southwest Utah, placed in-service in 2015;
• The 140-mile, 500-kV transmission line between Aeolus substation near Medicine Bow in Wyoming and Jim Bridger generating facility, placed in-service in 2020;
• The 416-mile, 500-kV high-voltage transmission line between the Aeolus substation and the Clover substation near Mona, Utah, placed in-service in 2024;
• The 59-mile, 230-kV high-voltage transmission line between the Windstar substation near Glenrock, Wyoming, and the Aeolus substation, placed in-service in 2024;
• The 290-mile, 500-kV high-voltage transmission line from the Longhorn substation near Boardman, Oregon, to the Hemingway substation near Boise, Idaho, (a joint project with Idaho Power and the Bonneville Power Administration), expected to be placed in-service in 2027; and
• Other segments that are expected to be placed in-service in future years, depending on load growth, economic analysis, IRP results, siting, permitting and construction schedules.