Sedro #4 transmission line and substation upgrade

Phase B - Belfast transmission line

Phase C - Samish Lake to Alger transmission line

2018 project updates

  • Phase C is currently in engineering and is expected to begin construction in 2019. Prior to construction, vegetation and trees will be trimmed in fall 2018.
  • Phase B construction began in June and is expected to continue through 2018.

Project overview

To increase electric reliability for customers in Skagit and Whatcom counties, PSE is rebuilding and reconductoring approximately 25 miles of existing transmission and distribution lines between Bellingham and Sedro Woolley.

Currently, the local electric system is prone to power outages due to limited capacity and aging infrastructure. The existing poles and conductors (wires) were built in the early 1960s and need to be replaced. Rebuilding these transmission and distribution lines with new, higher capacity wire and replacing the poles will strengthen the current system and reduce the frequency of outages for our customers in the area.

This overal project is broken into five phases:

  1. Phase A between Alger and Belfast was completed in 2017 (4 miles).
  2. Phase B includes rebuilding and reconductoring approximately 7.5 miles from Prairie Rd near Belfast to the Norlum substation in Sedro Woolley (7.5 miles).
  3. Phase C will rebuild and reconductor the lines from Samish Lake Park to Alger (6 miles).
  4. Phase D will rebuild and reconductor the lines from Bellingham substation to Samish Lake Park (6 miles).
  5. Phase E will rebuild and reconductor the lines from Norlum substation to Sedro Woolley substation (1.5 miles).

As part of Phase C, PSE will:

  • Rebuild approximately 6 miles of an existing 115 kV transmission line by replacing the existing structures with new wood poles and new, higher capacity 115 kV conductors (wires).
  • Replace aging distribution lines along the route as needed.

As part of Phase B:

  • Rebuild approximately 7.5 miles of an existing 115 kV transmission line by replacing the existing structures with new wood poles and new, higher capacity 115 kV conductors (wires).
  • Replace aging distribution lines along the route as needed.

In advance of construction, PSE will conduct vegetation management (brush clearing and tree trimming) throughout the existing corridor.



Contact us

We welcome your questions and comments! Please contact:
Bob Parker
Project Manager for Phase B

Hector Gonzalez
Project Manager for Phase C

1-888-404-8773
MajorProjects@pse.com