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Puget Sound Energy transmission line project

Enumclaw-Buckley-Burnett-Wilkeson-Carbonado-Orting area substation and transmission conversion

Spring 2014 project updates

  • Puget Sound Energy completed Phase 1 in October 2009 and Phase 2 in July 2010
  • Construction for additional phases is expected to take place between 2016 and 2019
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Project overview

To increase reliability and meet growing customer demand for power in the Enumclaw, Buckley, Burnett, Wilkeson, Carbonado and Orting areas, PSE is upgrading the existing 55 kilovolt (kV) substations and transmission line to the now current standard of 115 kV. The multi-year project entails converting the voltage of 20.2 miles of transmission line between the cities of Enumclaw and Orting, converting, upgrading or completely rebuilding five substations, and adding a fiber-optic line.

2009 projects

Electron Heights to Stevenson 115 kV transmission line rebuild, Phase I: PSE rebuilt eight miles of existing 55 kV transmission line to 115 kV line standards from our Stevenson switch, 1035 Stevenson Ave., Enumclaw, to just past our Wilkeson substation, located at 213 Church St. in Wilkeson. The new transmission line will not be energized to 115 kV until the project is complete in 2014.

2010 projects

Electron Heights to Stevenson 115 kV transmission line rebuild, Phase II: PSE rebuilt the final 12.2 miles of existing 55 kV transmission line to 115 kV transmission line standards from our Wilkeson substation to the Electron Heights switching station, 19319 Electron Road, Orting.

Future projects
  • Install a 115 kV capacitor bank within our Krain Corner substation, 10801 268th Ave. SE, Enumclaw. Construction is planned to begin in 2016.
  • Upgrade electrical equipment at our Enumclaw substation, 2201 Battersby Ave., Enumclaw. Construction is planned to begin in 2016.
  • Install a new 115 kV transformer and other related equipment at our Wilkeson substation. Construction is planned to begin in 2016.
  • Install a new fiber line between our "new" Buckley and Krain Corner substations. Construction is planned to begin in 2019.
  • Build a new Buckley substation off 112th Street East and demolish our old Buckley substation. Construction is planned to begin in 2019.
  • Remove old 55 kV equipment from the Electron Heights switching station. Construction is planned to begin in 2018.
  • Convert the voltage from 55 kV to our now current standard of 115 kV. Conversion is expected to be completed by 2019.

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.

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.

What is a fiber-optic line?

A fiber-optic line or optical fiber is a glass fiber that is designed to direct light along its length and is used for communication purposes. The fiber-optic lines used in our electric system are small, half-inch in diameter lines. Fiber-optic is light, less expensive, and able to carry much more information than radio and microwave communication.