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Puget Sound Energy electric transmission project

Sedro-Woolley-Beaver Lake 230 kV transmission line

Fall 2008 project completion
  • Fiber-optic construction was completed in November 2008
  • PSE completed construction of the new Sedro-Woolley 230 kV line in November 2008
Project overview

Puget Sound Energy upgraded the electric system in the Sedro-Woolley/Mt. Vernon area to meet customers' current and future needs by adding a new 230 kilovolt (kV) transmission line. The new transmission line increases overall system reliability, helps prevent power outages, and supports growth in the area for years to come.

In August 2007, PSE's contractor commenced work on the transmission line that runs between our Beaver Lake substation and the Sedro-Woolley substation. The project included adding an additional 230 kV transmission line on the east side of the steel lattice towers, repairing two towers, and routing the transmission line into the Beaver Lake substation. There was a nominal difference in appearance once the project was complete.

What is a substation?

Substations are critical links in the electricity distribution system, containing utility circuit protection, voltage regulation, and equipment that steps down higher voltage to lower voltage. Before reaching homes and businesses, power is routed through our transmission system to a substation where it is changed to a lower voltage that can be utilized by customers.

Download information

Download the PDF files for more detail on PSE's S Beaver Lake transmission line project.

Construction Notice (135 KB PDF)
Project map (226 KB PDF)
Before and After Image (289 KB PDF)