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Puget Sound Energy substation and transmission line project

Ardmore substation and electric transmission line project

Fall 2014 project completion

  • 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 was completed in summer 2014 and substation landscaping, including the plaza along NE 24th St, was completed in fall 2014.

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Project overview

PSE built a new substation and reconfigured existing transmission lines to meet increased demand for electricity in the south Redmond/northeast Bellevue area. The Ardmore substation increases system capacity to accommodate area growth and to improve electric reliability for customers. Extensive residential and commercial growth in the south Redmond/northeast Bellevue area resulted in the electrical load approaching the capacity of existing substations and transmission lines. PSE designed the substation so that we can expand electric capacity without expanding its footprint, which will help accommodate 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 selected the site for the new substation, located at 15335 NE 24th St. in Redmond (the site's former address was 2245 Bel-Red Rd). As part of this project we decommissioned the existing Interlaken substation, located at 2120 152nd Ave. NE in Redmond, and shifted the electric load of customers 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.

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.