State of Oregon: Facilities - Boardman to Hemingway Transmission Line

Applicant/Certificate holder:

Site Description:

The Boardman to Hemingway Transmission Line is an approximately 270.8-mile-long single-circuit 500-kV electric transmission line that crosses five counties in Oregon, Morrow, Umatilla, Union, Baker, and Malheur counties. The facility includes roads, communication stations, the Longhorn Station, and temporary construction areas.

Status:

Approved/Under Construction. Facility construction in Malheur County commenced in June 2025, in areas where the Department concurred that applicable preconstruction requirements had been satisfied. Preconstruction compliance is ongoing. Once preconstruction compliance concurrence is obtained from the Department for remaining work areas, construction is forecasted to continue through 2027.

Location:

Morrow, Umatilla, Union, Baker, Malheur, Owyhee (Idaho) counties.

Idaho Power Company

ODOE contact: Wally Adams

Applicant/Certificate holder contact: Joe Stippel

Project Timeline

Milestone	Additional Documents	Display Date
Notice of Intent		07/15/2010
Second Amended Project Order		07/26/2018
Complete Application (Large files)	Contents of the Application Exhibit A Exhibit B (Main) Exhibit B (Attachments B1-B4) Exhibit B (Attachments B5 Part 1) Exhibit B (Attachments B5 Part 2) Exhibit B (Attachments B6-B7a) Exhibit B (Attachments B7b) Exhibit C Exhibit D Exhibit E Exhibit F Exhibit G Exhibit H (Part 1) Exhibit H (Part 2) Exhibit I (Part 1) Exhibit I (Part 2) Exhibit J (Main Part 1) Exhibit J (Main Part 2) Exhibit J (Main Part 3) Exhibit J (JPA Part 1) Exhibit J (JPA Part 2) Exhibit J (JPA Part 3) Exhibit J (JPA Part 4) Exhibit J (Wetland Delineation Part 1) Exhibit J (Wetland Delineation Part 2) Exhibit J (Wetland Delineation Part 3) Exhibit J (Wetland Delineation Part 4) Exhibit J (Wetland Delineation Part 5) Exhibit J (Wetland Delineation Part 6) Exhibit K Exhibit L Exhibit M Exhibit N (Part 1) Exhibit N (Part 2) Exhibit O Exhibit P1 (Part 1 Main to Attachment P1-6) Exhibit P1 (Part 2a Attachment P1-7A) Exhibit P1 (Part 2b Attachment P1-7A) Exhibit P1 (Part 3 Attachment P1-7B) Exhibit P1 (Part 4a Attachment P1-8) Exhibit P1 (Part 4b Attachment P1-8) Exhibit P1 (Part 5 Attachment P1-9) Exhibit P2 (GRSG) Exhibit P3 (Elk) Exhibit Q Exhibit R Exhibit S Exhibit T Exhibit U Exhibit V Exhibit W Exhibit X Exhibit Y Exhibit Z Exhibit AA Exhibit BB Exhibit CC Exhibit DD	09/28/2018
Additions to Complete Application	Errata Table of Contents Exhibit C Errata Info Exhibit J Errata Info Exhibit K Errata Info Exhibit P Errata Info Exhibit Q Errata Info Exhibit R Errata Info Exhibit S Errata Info Redacted Exhibit S9 HPMP Errata Info Exhibit U Errata Info Exhibit W Errata Info Exhibit X Errata Info Exhibit AA Errata Info Exhibit BB Errata Info	03/28/2019
Final Order	Final Order with Attachments	09/27/2022
Complete Request For Amendment 1 (RFA1)	RFA1 Attachments and Figures	06/08/2023
Final Order on RFA1	Attachments 2 through P1-6	09/22/2023
Request for Amendment 2 (RFA2)	RFA2 Attachments/Figures	04/11/2024
Final Order on RFA2	Final Order on RFA2 Attachments	08/23/2024
Second Amended Site Certificate		08/23/2024