Rare view of Metaline Falls, on the Pend Oreille River., Photographed by Peter Clarke
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Denny Substation Project
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Powering Seattle through the 21st Century

The Denny Substation Project has made significant progress on substation design and art concepts. The project received approval from the Seattle Design Commission for the 60% design of Denny Substation Alternative SA3 (SCL's preferred alternative) and conditional approval of the Urban Design Merit of the proposed vacation of Pontius Ave N.

Located near Denny Way and Stewart Street, the Denny Substation is being designed to support and serve the future expansion and anticipated growth of the area.

The following equipment is being provided under the equipment procurement contract:
  1. (4-bays) 115kV Gas Insulated Switchgear (GIS)
  2. (3) 115-13.8kV power transformers
  3. (1) 115kV line reactor with integrated GIS
  4. (1) 13.8kV switchgear building
  5. (2) 13.8kV capacitor banks
  6. (3) 13.8kV grounding banks
  7. (1 lot) 115kV XLPE cable between equipment supplier equipment
  8. (1 lot) 15kV EPR cable between equipment supplier equipment
A new transmission line from the Massachusetts substation in SODO will be added to provide power to the Denny Substation. A new underground network power distribution system that connects and provides electricity to customers will also be built. To learn more, click here.

Denny Substation Design - Not your typical substation

Seattle City Light is committed to designing a substation that will fit with the neighborhood, advance community goals, and meet the City's goals for sustainability.

Though the majority of the site will be utilized for substation operations, City Light and the project team are exploring opportunities to advance neighborhood goals and priorities. The team is taking guidance from existing planning documents such as the South Lake Union Neighborhood Plan and Urban Design Framework and the Denny Triangle Neighborhood Plan. The design team will use these documents and others as starting points for the design of the substation.

Additionally, the project team will continue reaching out to and working with the neighborhoods and other stakeholders to ensure the community is involved in the final design of the substation. We want to hear from you. If there is something you would like the project team to consider as the design of the Denny Substation progresses, please let us know by emailing SCL_dennysub@seattle.gov.
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