Segment A - Wallula to McNary

Project Overview

In order to continue to provide reliable, safe and cost-effective electricity to customers, provide needed customer transmission service, and support new renewable energy development, this project is progressing to the construction phase. The majority of Private rights-of-way have been acquired, federal and local permitting is complete and the construction of the line was initiated in Q2 of 2018 for the new transmission line between our Wallula Substation in Washington and Bonneville Power Administration’s McNary Substation near Umatilla, Oregon. The transmission line was originally planned to also connect Wallula with an existing substation in Walla Walla, Washington. That section, however, is not scheduled to proceed at this time. The 30-mile, 230-kilovolt line between Wallula and McNary will be constructed on a 125-foot-wide right-of-way; a map is available on the fact sheet, linked below. We are working to minimize impacts to the community and local environment during project development, construction and maintenance.

Project Timeline

  • Public outreach – 2008 until project completion
  • Permitting (Local) – 2008 - 2018
  • Permitting (Federal) – 2008 - 2017
  • Begin construction – 2018
  • Estimated line in-service for customers – 2018 (sponsor driven)

Additional Information About the Project

Since 2008, our company has worked with landowners, community members, agencies, tribes and local governments, and conducted engineering, environmental and cultural studies to select a preferred route for the line. This route was submitted to permitting agencies in late 2008, with county conditional use permits issued in early 2009 and a State of Oregon Certificate of Public Convenience and Necessity issued in late 2011. The company continues to work with federal agencies to complete those permitting activities and obtain federal rights-of-way.

In 2009, we decided to move forward with only the 30-mile Wallula to McNary portion of this line based on requests for transmission service. We have delayed development of the Wallula to Walla Walla portion of the line based on an evaluation of evolving regional transmission and resource plans and the cost-effectiveness of our transmission investments.

In 2013, this project was delayed to allow for further assessment of customer needs and development of conditions that would move the project forward. Customers indicated a need for the project in mid-2014, at which point we re-initiated the permitting and rights-of-way acquisition processes.

In 2018 construction of the new line was commenced as planned.

Next steps: Complete Wallula to McNary project construction per plan with 2018 expected in-service date.  

Public Participation

Public input is an important part of the project, and welcome at all stages of the transmission line development. Since 2008, our company has gathered input about the project through public, group and individual meetings, and local agencies conducted public meetings and comment periods during their permitting processes. We will continue to provide project materials and newsletters to landowners and other interested parties.

To contact us about this project, please call toll free at 1-877-620-7678 or email Please be sure to include the project name – "Wallula to McNary" – in your inquiry.

Additional Resources

PDF Wallula to McNary Project Fact Sheet


(Updated October 2018)