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Puget Sound Energy electric transmission line project

Sedro-Woolley to Bellingham No. 3 transmission line

Fall 2009 project completion
  • Construction commenced in March 2009
  • Project completed November 2009
Project overview
Download full-size map

Project map (274 KB PDF)

PSE has rebuilt 23.5 miles of our existing 115 kilovolt transmission line, built in 1952, between our Sedro-Woolley and Bellingham substations. The project entailed removing the existing copper wire, installing new high-capacity wire which increases the capacity of the line four-fold, and the replacing of more than 425 poles along the line.

The rebuilt transmission line increases the reliability of the electrical system and allows for better use of existing capacity in Sedro-Woolley and Bellingham. The upgrade to our transmission line bolsters the service to customers in both Skagit and Whatcom counties.

What is a transmission line?

Transmission lines are key elements in the electrical distribution system. The lines safely transport high voltage electricity from power generation sources like dams and wind generating facilities to substations in local communities. Transmission normally takes place at voltages of 55 kV and higher.



Download full-size map

Aerial map (474 KB PDF)

Download the information

Download the following PDF files for more detail on the Sedro-Woolley to Bellingham substation transmission line project.
News release Nov. 6, 2009
Fact Sheet, June 2009 (59 KB PDF)
Meeting invite, Feb. 2009 (474 KB PDF)
Aerial map (322 KB PDF)
Fact Sheet, Feb. 2009 (322 KB PDF)
Project map (274 KB PDF)