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Puget Sound Energy transmission line and substation project

Somerset and Newcastle-area transmission reliability improvement projects


Spring 2015 project updates

  • The project is currently in the design phase.
  • Permit applications are expected to be submitted in 2016.
  • Construction is expected to begin as early as 2019.

Project overview

To improve electric reliability for customers in the Somerset and Newcastle areas, PSE plans to upgrade the existing 115 kilovolt (kV) transmission electric system serving the area. Specifically, we plan to “loop” the existing Shuffleton-Lakeside 115 kV transmission line though the existing Hazelwood substation in Newcastle, as well as rebuild and expand the substation.

These upgrades will provide improved electric reliability as well as make room for future electric capacity increases. A transmission line “loop” creates redundancy, which provides more flexibility to switch customers to different power sources in the event of an outage. The expansion of the substation will provide greater capacity to meet local energy needs during periods of high demand, such as cold winter weather. The substation expansion will require the footprint of the existing substation to approximately double in size. In addition, we will add equipment near the intersection of Coal Creek Parkway and Factoria Boulevard that will improve outage restoration times.

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What is a transmission line?

Transmission lines are key elements in the electrical distribution system. These 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.

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.

Committed to keeping you informed

PSE will continue to provide updates to the community. We will notify residents and businesses near the project area when construction will occur. We aim to complete the work with as little disruption as possible.