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Puget Sound Energy transmission line project

Cottage Brook-Stillwater-Novelty transmission line

Fall 2014 project updates

  • The project consists of two phases. During Phase 1 we will reconductor the line between the Novelty Hill substation and Stillwater substation. Phase 1 construction began the week of Sept. 22, 2014.
  • During Phase 2 we will reconductor the line from the Stillwater sub to Cottage Brook substation. Phase 2 construction is expected to take place between 2015 and 2016.

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Project map

Project overview

The existing electric system serving customers in parts of Duvall and unincorporated King County is almost 100 years old and approaching its capacity limit, putting the homes and businesses that rely on it at risk of outages. The lines were not built to meet the needs of a 21st Century community, and can become overloaded during periods when energy use is particularly high, such as very cold or very hot days. In addition to the limitations of the small capacity wire that exists today, the height and configuration of the poles increase the possibility of damage and outages due to trees and tree branches.

By rebuilding the existing power lines with higher-capacity wire, PSE will improve the dependability of the electric system that serves you and your neighbors and ensure PSE is able to meet the future energy needs of the community. Specifically, Puget Sound Energy is planning to rebuild eight miles of existing power lines 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), see map for details.

In addition, we'll also be transferring a particularly vulnerable part of the overhead distribution line near the Cottage Brook substation, to underground. Doing so will put the distribution circuit at lower risk for outages.

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.