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Puget Sound Energy substation project

Ardmore substation

Winter 2014 project updates
  • Construction of the underground distribution lines started in early August 2011 and was completed in April 2012
  • Substation construction began in July 2011 and was completed in June 2012
  • Final transmission line construction is expected to be completed in mid 2014. Once the transmission line work is complete, we'll decommission the existing Interlaken substation
Project overview

PSE needs to build a new substation and reconfigure existing transmission lines to meet increased demand for electricity in the south Redmond/northeast Bellevue area. The Ardmore substation will increase system capacity to accommodate future growth and improve electric reliability for customers. Extensive residential and commercial growth in the south Redmond/northeast Bellevue area has resulted in the electrical load approaching the capacity of existing substations and transmission lines. PSE will design the substation so that we can expand electric capacity without expanding its footprint, which will help accommodate the long-term plans of the cities of Bellevue and Redmond to increase land use densities in the Bel-Red corridor and Overlake area.

After several public meetings, PSE has selected a site for the new substation, located at 15335 NE 24th St. in Redmond (the site's former address was 2245 Bel-Red Road). As part of this project we will decommission the existing Interlaken substation, located at 2120 152nd Ave. NE in Redmond, and shift the electric load of customers currently served by Interlaken substation to the new Ardmore substation.

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.

Download full-size map
Project map
(192 KB PDF)
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.

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 information

Download these PDF files for more detail on PSE's Ardmore substation and electric transmission line project.

Construction notice, June 2011

November 2010 meeting
Meeting invite, Nov. 2010
(143 KB PDF)
Existing electric facilities to be removed
(3 MB PDF)
Sample substation wall designs
(251 KB PDF)
Fact sheet, revised Nov. 2010
(153 KB PDF)
Examples of typical transmission structures
(1 MB PDF)
Sample substation retaining wall designs
(4 MB PDF)
Existing transmission line route
(582 KB PDF)
Aerial vicinity map
(198 KB PDF)
Permit process flow chart
(61 KB PDF)
Transmission line route after construction
(363 KB PDF)
Ardmore substation site plan
(925 KB PDF)
September 2008 meeting
March 2009 meeting
December 2009 meeting
Aerial map
(1 MB PDF)
Aerial map
(417 KB PDF)
Meeting invite, Dec. 2009
(159 KB PDF)
Ardmore map
(192 KB PDF)
Meeting invite, March 2009
(142 KB PDF)
Fact sheet
(142 KB PDF)
Meeting invite, September 2008
(270 KB PDF)
Fact sheet
(200 KB PDF)
Aerial map
(877 KB PDF)
Fact sheet
(84 KB PDF)
Aerial map site D
(263 KB PDF)
Transmission route options
(594 KB PDF)
TransmissionLines Aerial A
(534 KB PDF)
Transmission site D map.pdf
(514 KB PDF)
Transmission route options 2
(1 MB PDF)
TransmissionLines Aerial B
(534 KB PDF)
Photo simulations site D 
(314 KB PDF)
TransmissionLines Aerial C
(532 KB PDF)
Energy Landscaping booklet
(2 MB PDF)
TransmissionLines Aerial D
(533 KB PDF)
Ardmore landscape plan
(921 PDF)
TransmissionLines Aerial E
(533 KB PDF)
Permit process
(29 KB PDF)
Updated project map
(198 KB PDF)