ROUTE INFORMATION   
Route selection

The Bureau of Land Management announced their Record of Decision (ROD) for segments 1 through 7 and segment 10 in November 2013, deferring the decision on segments 8 and 9. The BLM released its ROD for segments 8 and 9 on January 19, 2017. The routes authorized by the BLM in the ROD were selected from the agency preferred alternatives, after the BLM:

  • Considered project changes submitted in February 2012 by Rocky Mountain Power and Idaho Power.
  • Reviewed draft environmental impact statement (EIS) comments.
  • Coordinated with local, state and federal governments and cooperating agencies.

Some of the BLM authorized routes are not the companies’ proposed routes. While the proposed routes as revised in February 2012 are preferred, the companies are bound to the agency’s preferred routes, but only on publicly-managed land.

On privately owned land, the companies have more flexibility for transmission line siting within the study corridor. The companies will continue to work with individual landowners on “micro-siting” of the transmission line and have more detailed discussions as the design progresses.

BLM authorized routes

The BLM’s authorized routes are:

  • Segment 1W(a) - Companies’ proposed route. The companies will pursue permitting only one new 230 kV line for Segment 1W(a) and reconstruction of the existing line for Segment 1W(c).
    Segment 1W(c) - Proposed Route. The companies will pursue permitting only one new 230 kV line for Segment 1W(a) and reconstruction of the existing line for Segment 1W(c).
  • Segment 2 - Companies’ proposed route including the substitution of Alternative 2C as part of the Rocky Mountain Power and Idaho Power’s revised Proposed Route.
  • Segment 3 - Companies’ proposed route.
  • Segment 4 - Companies’ proposed route including the substitution of Alternative 4A as part of the Rocky Mountain Power and Idaho Power’s revised Proposed Route.
  • Segment 5 - Companies’ proposed route and Alternative 5B. The BLM also supports Alternative 5E as part of its authorized route assuming Western Electricity Coordinating Council reliability issues are resolved.
  • Segment 6 - Upgrade the existing line voltage from 345 kV to 500 kV (no additional new line construction is required).
  • Segment 7 - Companies’ proposed route and Alternatives 7B, 7C, 7D, and 7G.The companies’ proposed route in the East Hills and Alternative 7G will be micro-sited to avoid Idaho’s Preliminary Priority Sage-grouse Habitat (PPH).
  • Segment 8 - Alternative 8G
  • Segment 9 - Alternative 9K with Toana Road Variation 1
  • Segment 10 - Companies’ proposed route.
Companies proposed route revisions (February 2012)

In February 2012, Rocky Mountain Power and Idaho Power announced that Segment 1E would be removed from the project. The companies submitted a revised project application (known as an SF-299) to the BLM. These changes were considered when the BLM selected agency preferred alternatives. Changes included:

  • Segment 1 - Between the Windstar and Aeolus substations, the eastern 230 kilovolt segment (known as Segment 1E) of the project was removed from the project proposal. Segment 1W, as currently proposed, remains in the proposed project.
  • Segment 2 - Alternative 2C became the companies’ proposed route.
  • Segment 4 - Alternative 4A became the companies’ proposed route.
  • Creston substation - removed this proposed substation between Segment 2 and 3.
Route development history

All proposed, alternate and other routes analyzed in the draft and final EISs were developed with extensive study and planning and factored in input from state, local and federal agencies as well as private landowners. The companies developed initial routes through the following steps:

  • Established overall goals for routes
  • Evaluated opportunities and constraints using geographic information systems (GIS), field studies, and input from agencies and community leaders
  • Presented preliminary routes to the public during BLM scoping meetings held in June 2008 as well as company led landowner meetings between 2008 and 2009

Following scoping information, public comments and additional route analysis, the BLM determined which alternatives to carry forward for detailed analysis in the draft EIS, which contained rationale for alternative routes not analyzed in detail. The final EIS fully analyzes the BLM's preferred alternatives. A final decision on routing on public land for the project project in segments 1 through 7 and segment 10 was announced by the BLM in the November 2013 ROD. A draft supplemental EIS for segments 8 and 9 was released March 11, 2016, and the final supplemental EIS was published on October 7, 2016. The BLM released its ROD for segments 8 and 9 on January 19, 2017.

Field studies and land surveys

Idaho Power and Rocky Mountain Power continue to conduct studies and surveys to better understand conditions along the various corridors. The companies’ contractors are conducting land surveys, documented cultural and environmental conditions and collected soil borings. Information collected in these surveys helped inform the Bureau of Land Management's (BLM) EIS and will continue to inform the design and engineering of the project.

Please note that permission to enter private property for surveying and information gathering does not constitute a grant of future easement or that a transmission line will be constructed across the property, it is simply an allowance to conduct the studies. These studies do not mean a decision has been made on where to locate the transmission line.