Segment H - Boardman to Hemingway

Project Overview

Our Energy Gateway transmission expansion investment is intended to better integrate our company's East and West control areas. Building a line west into Oregon from the Hemingway Substation near Melba, Idaho will increase system flexibility and reliability to serve customers. While originally proposed as an approximately 375-mile, single-circuit 500-kilovolt transmission line from the Hemingway Substation to a substation near Klamath Falls, Oregon, we pursued joint development opportunities with regional entities on alternatives to this proposed configuration. To that end, in January 2012, we signed a permitting agreement with Idaho Power and Bonneville Power Administration on the proposed Boardman to Hemingway line.

Project Timeline

Transmission options for “Boardman to Hemingway” are being considered from among alternative projects and will be brought into service as soon as appropriate for PacifiCorp customers. For more information please refer to the project websites for Idaho Power’s Boardman to Hemingway project.

Additional Information About the Project

The proposed Boardman to Hemingway transmission line is a 500-kilovolt line that would run approximately 300 miles from a new substation proposed near Boardman, Oregon, to the Hemingway substation near Melba, Idaho, southwest of Boise, Idaho. The agreement between the three companies provides funding for environmental review and permitting, ensuring continued consideration of the project.

Public input is an important part of this process, and will be welcomed at all stages of this project. To contact us about this project, please call 801-220-4221 or email Please be sure to include the project name – "Boardman to Hemingway" – in your inquiry.


(Updated March 2019)