Powering Seattle through the 21st Century

Denny Substation Program

WHAT’S NEXT? In the second quarter of 2018, crews will complete installation of the substation’s siding and glass and will put the finishing touches on the elevated walkway. Other upcoming work in and around the substation includes restoration of the alley, build-out of the community spaces, and final paving on Minor Avenue N and inside the substation. Installation of the substation artwork will begin in May.

In addition to advancing the Cascade Neighborhood Street Improvements, the Denny Network will continue with duct bank installation and roadway restoration in the South Lake Union area.

CONSTRUCTION SCHEDULE

2016 2017 2018 2019 2020

Denny Substation

Substation Energized

Denny Network Ongoing Network Service Connections

VISIT OUR WEBSITE:www.seattle.gov/light/dennysub

SEND US AN EMAIL:SCL_dennysub@seattle.gov

CALL OUR HOTLINE:(206) 257-2142

Denny Substation and Denny Network Construction Map

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Ramps to and from I-5

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Completed Duct Bank, Roadway Restoration, and Final Driving Surface

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DENNY NETWORK ONGOING CONSTRUCTION

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Project map showing progress of work for Denny Substation and Denny Network construction.

Powering Seattle through the 21st Century

Denny Substation Program

QUARTERLY REPORT 1 S T Q UA R T E R | 2 0 1 8

WE’RE IN THE HOME STRETCH!

We’re excited to report that both the Denny

Substation and Denny Network projects are

scheduled to be complete in late summer

2018. This year will be packed with major

milestones. Whether or not you’ve stayed up

to date on the project thus far, now’s a good

time to follow closely!

We’re looking forward to energizing the

substation in April, completing John Street

restoration in May, and making neighborhood

improvements around the Cascade Playground

and P-Patch throughout the spring.

What’s energization and why does it matter? Energization is the gradual process of “turning on” the

substation so that it can deliver power to customers.

Since providing power is the substation’s primary

function, energizing it and ensuring everything is working

properly before customers receive electricity are critical

steps toward project completion. The process begins

by bringing high-voltage electricity into the substation’s

three transformers to make sure they can transform high-

voltage electricity into lower voltages that can be used

by customers. The next step involves testing the new

network trunk lines under electrical load. Once this step

is completed, electricity is then distributed through the

feeder lines that will deliver power to customers.

Glass installation on the west side of the substation is nearing completion.

COMMUNITY SPACE PROGRESSOur 2017 year-end report featured the start of construction on the substation’s community and event space. Since then, we’ve framed interior walls and installed the exterior glass. When construction is finished, an outdoor plaza with seating and a food-truck zone will be located just outside the door of the community space on the west side of the substation.

About 4,000 square feet of community space will open onto an outdoor plaza and the off-leash area once the substation is complete.

Denny Substation ProgramPowering Seattle through the 21st Century

ALL ABOUT THE ALLEYWhat’s to come: The alley on the east side of the substation won’t be anything like it is now. As featured in the rendering below, the translucent glass will allow light from the substation to shine through to the alley. The line of concrete seen in the center of the picture at left will form the outer wall of the bioretention planter, which will naturally treat all the stormwater that drains through the alley. These changes, along with new lighting and decorative paving, are designed to create a safer and more pleasant pedestrian experience in the neighborhood.

INSIDE THE SUBSTATION:

PAVING THE WAY You see paving on the streets outside the substation, but did you know that the inside of the substation will also be paved? By the end of April, the entire inside of the substation will be done.

Crews grade the interior yard of the substation in preparation for paving.

OUTSIDE THE SUBSTATION:

A “CROWN” FOR THE ROAD

Crews prepare Minor Avenue N for final paving by adding a layer

of pavement that will give the road a “crown,” which will allow

for proper drainage.

In Seattle, it’s important that we prepare the roads for lots of rain. Adding a “crown”—an outward slope on the road surface—ensures that rainwater will run off to street drains, avoiding flooding.

AROUND THE SUBSTATION: CASCADE NEIGHBORHOOD STREET IMPROVEMENTSAmong the most prominent changes around the substation are the improvements on Thomas Street in the Cascade neighborhood. The new pedestrian street lights and water-permeable sidewalks have been installed! The lighting will help make the neighborhood safer, and the permeable sidewalks and soon-to-be-installed drainage systems and landscaping will make the surrounding area greener and more attractive.

Permeable concrete is highly porous material that reduces the amount of runoff to street drains. When it rains, water infiltrates the sidewalk and seeps slowly into the soil rather than being discharged to storm drains. The soils naturally treat the stormwater and reduce impacts to water quality.

New pedestrian lighting and sidewalks in the Cascade neighborhood are among the improvements being made to make the neighborhood safer and greener.

Permeable concrete sidewalk on Minor Avenue N in the Cascade neighborhood.