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Seattle City Light LARRY WEIS, General Manager and CEO
Denny Substation Project
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Denny Substation Program Update

Stewart Street Lane Closures


Late February through early May, Denny Network construction crews will close lanes on Stewart St between Minor and 6th avenues for final street restoration. Seattle City Light encourages drivers to plan ahead and use alternative routes during this time. This work will occur in two stages:

Stage 1: February 27 – March 10


During peak-hour traffic, 5 a.m. to 10 a.m., Monday through Friday, Stewart St between Minor and Boren avenues will be reduced to 3 lanes of traffic.


Peak hour traffic configuration


During non-peak hour traffic, 10 a.m. to 5 a.m., Monday through Friday, Stewart St between Minor and Boren avenues will be reduced to two lanes of traffic.


Non-peak hour traffic configuration

Stage 2: March 7 – May 1


During weekdays, Stewart Street between 9th and 6th avenues will be reduced to two lanes of traffic.


Lane configuration at all times


Weekend hours for both stages of work:


If no work is scheduled, the left lane will be closed and two general purpose lanes and one transit lane will be open. If work is scheduled, the two left lanes will be closed and two general purpose lanes will be shared by transit and all other vehicles.

Project Status


Seattle City Light is constructing a new electrical substation (Denny Substation) and an underground distribution network (Denny Network) to accomplish a major electrical system upgrade for the city of Seattle.

Construction of the substation began in May 2016 and is expected to be complete in mid-2018. Construction of the network, which is being installed underground in the South Lake Union and Denny Triangle neighborhoods, began in February 2016. This work is also anticipated to be complete in mid-2018. Learn more about the sequence of work, the construction schedule, and what to expect on our interactive construction map.

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Updated: February 2017


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Project Hotline:
(206) 257-2142

Email Address:
SCL_DennySub@seattle.gov

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