Online Open House: April 4 - June 9, 2016
The Gateway West Transmission Line Project is jointly proposed by Rocky Mountain Power and Idaho Power (referred to as the Proponents in BLM documents) to build, operate, and maintain approximately 1,000 miles of new 230 kilovolt (kV) and 500 kV electric transmission lines across southern Wyoming and southern Idaho. In May 2007, the Proponents applied for a right of way (ROW) grant to use BLM-managed public lands for portions of the Gateway West Project Transmission Line Project.
The Proponents proposed the line as 10 segments originating at the Windstar substation near Glenrock, Wyoming and terminating at the Hemingway substation near Melba, Idaho, 20 miles southwest of Boise. After extensive environmental review under the National Environmental Policy Act (NEPA), the BLM approved eight of the 10 segments (segments 1 through 7 and 10) in November 2013. The BLM deferred offering a ROW grant for segments 8 and 9 in southwestern Idaho to allow additional time for Federal, State and local agencies to work together on identifying routes for these segments and on mitigation and enhancement measures for resources in the Morley Nelson Snake River Birds of Prey National Conservation Area (NCA).
In August 2014, the Proponents submitted a revised ROW application for segments 8 and 9. The BLM determined that new information included in this ROW application would require additional analysis to supplement the analysis in the 2013 Final Environmental Impact Statement (EIS) for the original, 10-segment project.
Segments 8 and 9 of the project span about 125 miles between substations at Cedar Hill and Midpoint in south-central Idaho and the Hemingway substation in western Owyhee County.