Winter in North Cascades National Park
Seattle City Light DEBRA SMITH, General Manager and CEO
Denny Substation Project
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Construction [Denny Network]

Construction Update

City Light's contractor, Shimmick Construction Company, Inc. (SCCI), began construction of the network in February 2016 and is moving into the final stage of construction. Throughout the life of the project, SCCI has installed nearly three miles of duct bank and have conducted work at nearly 30 vaults throughout South Lake Union and the Denny Triangle neighborhoods. Construction continues with roadway restoration and channelization, and a series of small-scale weather-dependent closeout tasks.

Distribution Network

The Denny Network is being built underground in South Lake Union and the Denny Triangle. Construction is occurring by block and mostly in the public right-of-way. Typical impacts include daytime and nighttime work, parking restrictions, transit and pedestrian detours, dust, and noise. Work sometimes requires lane restrictions and street detours, but streets typically remain open to traffic during construction.

Below are examples of what typical construction activity looks like in the project area.

demolition example photo

Potholing to confirm utility locations

excavation example photo


installation example photo

Shoring (trench reinforcement)

restoration example photo

Duct Bank Installation

demolition example photo

Vault Installation

excavation example photo

Back Filling Vault

installation example photo

Temporary Street Restoration

installation example photo

Final street restoration

Network construction, occurring over a period of approximately 24 months, consists of the following steps:
  • Locating underground utilities
  • Excavating and removing concrete and asphalt
  • Installing duct banks and electrical vaults
  • Backfilling excavation
  • Installing permanent concrete and asphalt pavement
  • Repairing and installing sidewalks, curb ramps and curb bulbs
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    700 5th Avenue
    Suite 3200
    P.O. Box 34023
    Seattle, WA 98124-4023

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