Project status:

Welcome to the Denny Substation Project page, your portal to information about Seattle City Light's design, construction and associated elements of a new electrical substation, transmission line, and power distribution network necessary to serve areas of our growing city.

April 2013

At the City Council’s request, City Light studied options for co-development on the Denny Substation site. City Light reported the results of its study to the City Council on April 1st. Click here to view the presentation and discussion of co-development options.

City Light has begun the second phase of the environmental clean-up of the former Greyhound Bus Maintenance facility. The first phase of the clean-up was completed in October 2012 and included: removal of underground storage tanks and hazardous building materials, salvage of doors and windows, demolition and recycling of asphalt and other materials, demolition and removal of the bus garages and shops, installation of erosion controls, and additional soil sampling.

In the second phase, a shoring wall will be constructed to support excavation of contaminated soil, which will be removed from the site and properly disposed. The site will be backfilled with clean soil, streets will be restored and improved, and the site maintained in anticipation of City Light’s proposed substation construction, scheduled to begin in 2014.

Phase 2 of the environmental clean-up began April 1st and is scheduled for completion in October 2013. Here’s what to expect during construction:

• Pontius Avenue will be closed between Denny Way and just short of John Street, allowing continued access to the Brewster Apartment Building east entrance
• Work hours will typically be between 7 am and 3:30 pm on weekdays, but could extend to 7 pm
• Additional truck traffic on John Street, Denny Way, Fairview Avenue, Mercer and Westlake. Click here to view a map of the general truck routes
• Construction noise typical to the use of heavy equipment
• Parking restrictions and sidewalk and lane closures on John Street between Pontius Avenue and Yale Avenue and along Pontius for the duration of the street closure
• Sidewalk closure on the east side of Minor Avenue between Denny Way and John Street
• Partial closure of the Alley behind the Colwell Building
• Utility relocations on John Street and Pontius Avenue requiring brief electrical and water service disruption for some customers
• Should interruption of electric service be required, expect at least 10 days advance notice
• Should interruption of water service be required, residential customers should expect 2 days notice and business customers should expect 5 days notice.