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Puget Sound Energy transmission line project

Cottage Brook-Stillwater-Novelty transmission line

Spring 2014 project updates

  • PSE representatives completed surveying the project area in 2012 and in 2013 completed environmental surveys of the entire 7.8 mile project area.​
  • We are currently in the engineering phase for the project, and we anticipate submitting permit applications in 2014.
  • The project consists of two phases. During Phase 1 we will reconductor the line from Novelty to Stillwater. Phase 1 construction is expected to take place in summer 2014. During Phase 2 we will reconductor the line from Stillwater to Cottage Brook. Phase 2 construction is expected to take place between 2015 and 2016.

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Project overview

The existing power lines that serve customers in parts of Duvall and unincorporated King County are almost 100 years old; these lines were not built to meet the needs of a 21st Century community, and can become overloaded during periods where energy use is particularly high, such as very cold or very hot days. The existing electrical system in this area is approaching its capacity, putting the homes and businesses that rely on it at risk of outages. In addition to the limitations of the small capacity wire that exists today, the height and configuration of the poles and age of the wire increase the possibility of damages and outage due to trees and tree branches. By rebuilding existing power lines with higher-capacity wire PSE will improve the dependability of the electric system that serves you and your neighbors and meet the future energy needs of the community.

To improve the reliability of the energy we supply to the area, Puget Sound Energy is planning to rebuild eight miles of existing power line between the Cottage Brook substation (14401 188th Ave NE in Woodinville), the Stillwater substation (13201 277th Ave NE in Duvall) and the Novelty Hill substation (24525 NE 102nd St in Redmond). The 98-year-old transmission line is approaching the capacity of the energy use it can handle, putting you at risk for power outages during periods of particularly high demand for power.


We will also be transferring a particularly vulnerable part of the distribution line near the Cottage Brook substation underground, where it will be at much lower risk for damage that could cause an outage to a large area.

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.