Waldron Island and President Channel seen from Orcas Island, Washington. Photo by Somelab
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Denny Substation Project
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Project Update

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.

The substation will be anything but ordinary in design and function. Its final design includes 44,000 square feet of open space, an elevated walkway, and community event spaces, as well as neighborhood streetscape improvements. The substation will transform electricity into manageable voltages and will create renewable energy through solar technology and a heat recovery system.

The distribution network will deliver electricity to customers throughout South Lake Union and Denny Triangle.

Together, the Denny Network and Substation will provide improved reliability and system flexibility, benefiting customers both in and beyond the project area.

Construction will begin this fall and is scheduled for completion in mid-2018.

Project Status

Fall 2015: What's new?

  • In August, the Seattle City Council unanimously approved final design of the Denny Substation!

  • Distribution network (Denny Network) construction will begin later this fall throughout South Lake Union and Denny Triangle neighborhoods. Crews will work on multiple streets in the project area at the same time. Construction will take place typically between 6 a.m. and 7 p.m. weekdays, but will include some weekend, night and early morning work. See our Denny Network page for more information.

  • Denny Substation construction will begin in spring 2016.

  • ALL RISE, the art program created to activate the Denny Substation site with art installations and performances until construction begins, is currently featuring murals created by Spencer Keeton Cunningham.

Last Updated: September 23, 2015

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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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