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Puget Sound Energy electric transmission line project
Thurston 230 kV transmission line
Fall 2013 project updates
- Puget Sound Energy has selected our preliminary preferred route for the new transmission line (See project map).
- We started the permitting process in December 2011.
- PSE representatives and contractors completed a geotechnical analysis of the transmission line corridor in September 2012. Soil samples and other subsurface geotechnical data will help our engineers complete power pole designs.
- We hope to start construction on the transmission line in February 2014 with completion by June 2014.
- Construction on the St. Clair substation in Olympia began in early January 2013 and was completed in late September 2013. Crews replaced and added new electrical equipment to the substation; this work will allow us to connect the new transmission line into the substation.
Puget Sound Energy plans to install approximately 3.2 miles of new 230 kilovolt transmission line between the St. Clair substation, 9512 Pacific Highway SE in Olympia, and an interconnection point on the Bonneville Power Administration's South Tacoma-Olympia 230 kV transmission line ( See map for location ).
We are constructing the new transmission line to increase the capacity and reliability of the regional electric transmission system for more than 120,000 customers in Thurston County. We estimate that our existing Thurston County transmission system will reach capacity in 2013. Adding the new transmission line will allow PSE to respond to the county's growing need for power while increasing overall reliability.
We will also expand the St. Clair substation within the existing property boundaries to accommodate the new transmission line.
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 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.
For more information on this project, email Project Manager Heather Brickey at firstname.lastname@example.org.
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.
For information on electric and magnetic fields, please view PSE's EMF statement.
Download the information
Download these PDF files for more detail on our Thurston 230 kV electric transmission project.
Project update letter, November 2011
Project aerial map
Project road map
February 2010 public meeting
Meeting invite, February 2010
Newspaper ad, February 2010
Aerial map of study area
Fact sheet, February 2010
Thurston County project need, Feb. 22
Alternative solutions, Feb. 22
Route selection evaluation criteria, Feb. 22
New 230 kV transmission line, Feb. 22
Thurston County planned transmission projects, Feb. 22
Crosscountry utility landscaping zone, Feb. 22
Roadway utility landscaping zone, Feb. 22
October 2009 community advisory group meeting
Community advisory group presentation, Oct. 15, 2009