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.
On December 12, 2025, the Oregon Department of Energy (Department) received an Amendment Determination Request (ADR), pursuant to OAR 345-027-0357(3), from Idaho Power Company seeking a written determination on whether a site certificate amendment is needed to expand the micrositing corridor by 1.22 acres in Union County for road modifications. The proposed expanded micrositing corridor is within the approved site boundary.
Two primary changes are proposed within the 1.22 acre micrositing corridor expansion area. The first set of changes applies to two road segments (referred to as UN-461 and UN-642), where the certificate holder seeks approval to construct two new spur roads and a wider turn radius workspace in areas where slopes are greater than 30%. The second change is to construct approximately 315 feet of new road segment (while abandoning the previously reviewed segment [UN-536] extending 350-feet, to avoid impacting guy wires of an existing transmission line).
Following review of the ADR, the Department will issue a written determination, which will be provided on this project webpage, and announced at a subsequent Council meeting.