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Denny Substation Project
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Denny Substation Project Update

Project Status

Seattle City Light (City Light) will construct a new electrical substation (Denny Substation) and an underground distribution network (Denny Network) to accomplish a major electrical system upgrade for our rapidly growing city.

PSE Utility Relocation Work

In advance of City Light’s Denny Network construction, Puget Sound Energy (PSE) will be relocating segments of the existing natural gas lines in South Lake Union and the Denny Triangle. This work will help PSE to provide safe and reliable natural gas service. Utility relocation is scheduled to begin in November 2015 and will occur at approximately 15 locations through March 2016.

Associated impacts include:
  • Weekday work hours 7:30 a.m. to 4 p.m.
  • Half-block to full-block construction zones
  • Some weekend and evening work
  • Lane restrictions
  • Possible parking and loading restrictions
  • Some increased noise and truck activity
  • Possible short interruptions of gas service
No impacts to electric service are expected.

Open House: Meet the Contractor

Attend an open house to meet City Light's contractor and learn more about the upcoming network construction:
  • When: Tuesday, December 8, 5:00 – 7:00 p.m.
  • Where: Gethsemane Lutheran Church
    911 Stewart Street
Can't make it? We'll also be holding an online open house:

Denny Network Construction Update

The Denny Network Project has selected a construction contractor. Once the contract is finalized, more information will be available as to when and where construction of the network will take place.


The ALL RISE temporary art program of art installations and performances, which kept the Denny Substation site active during the past eighteen months, has ended. The remaining on-site materials will be cleared out to provide space for construction crews to stage project equipment and park vehicles. Construction of the Denny Network will begin construction in late 2015. Denny Substation will begin construction in early 2016.

Last Updated: November 1, 2015

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(206) 257-2142

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  • Contact Seattle City Light

    700 5th Avenue
    Suite 3200
    P.O. Box 34023
    Seattle, WA 98124-4023

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