Gateway West

The Gateway West project is jointly proposed by the company and Idaho Power to build and operate approximately 1,000 miles of new high-voltage transmission lines in Wyoming and Idaho. It is comprised of two major line segments. 

  • Windstar to Populus, Segment D, will stretch approximately 488 miles starting at the Windstar substation near Glenrock, Wyoming, proceeding south to Medicine Bow and then spanning across southern Wyoming to the Populus substation near Downey, Idaho. 
  • Populus to Hemingway, Segment E, originates at the Populus substation near Downey, Idaho, and includes two 500 kilovolt single-circuit transmission lines that run approximately 502 miles across Idaho to the Hemingway substation near Melba, Idaho. 

(Note: As a party to the project, Idaho Power has interest in specific segments between Populus and Hemingway, Gateway West Segment E.)

Next steps

The Record of Decision and rights-of-way grant contains many conditions and stipulations that must be met and accepted before the project segments can move to construction. Rocky Mountain Power and Idaho Power Company will continue the work to meet these requirements, meeting regularly with the Bureau of Land Management to review progress.

There is more work to be done to obtain state and local permits, as well as obtaining rights-of-way for individual segments. The companies will continue evaluating the timing of next steps in the project to best meet our customer and system needs.

Project history

(Updated March 2021)