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Seattle City Light is building an electrical substation, its first in 30 years, near the intersection of Denny Way and Stewart Street. In addition to the new substation, the Denny Substation Project will include an underground distribution network to deliver power and a transmission line to feed the electricity to the substation. This necessary upgrade to our electrical infrastructure will ensure reliable power to meet current and future electrical needs, support economic growth, and provide system flexibility for the north downtown/South Lake Union area and beyond.
This report provides a closer look at the equipment that makes it possible for City Light to deliver electricity to its customers. Also included is a construction update: where it will occur and what to expect.
QUARTERLY REPORT
Denny Substation
ProjectPowering Seattle through the 21st Century
INSIDE THE DENNY SUBSTATION - CONSTRUCTION - PROJECT TIMELINE
2ND QUARTER | 2015
INSIDE:
FEATURE: ALL RISE
Over 40 goats grazed the Denny Substation site to make way for a new ALL RISE art project.
DID YOU KNOW?The substation will generate some of its own electricity through solar power.
Garage Door
MIN
OR A
VEN
UE
YALE AVE
ALLEY
NORTH
JOHN ST
DENNY WAY
To Canal Street Substation
From Massachusetts
Street Substation
MaintenanceBuilding
To Broad Street Substation
David ColwellBuilding
The Brewster
Control Building
Pump House
From East Pine Substation
12
2
3
4
6
5
7
9
10
11
11
11
8
A LOOK INSIDE THE DENNY SUBSTATIONThe Denny Substation will serve new and expanding companies and institutions and bring critical improvements to the transmission grid. The “engine” of the substation — the equipment that manages and distributes electricity — is state of the art, and it’s more compact and less obtrusive than at most substations. In fact, it’s small enough that most of it will be housed inside buildings. Furthermore, unlike typical substations, there will be
no aboveground power lines. Instead, both the outgoing power distribution and incoming transmission lines will be underground and out of sight. The Denny Substation will begin serving existing customers in 2018 and has been designed to meet long-term demand for reliable power as the city continues to grow.
EQUIPMENT
LEGENDSouth Lake Union Distribution Line
Denny Triangle Distribution Line
Transmission Line
1 INDUCTORAn electrical component, usually a wire coil that resists changes in electric currents passing through it, acting like a valve in a pipe. Inductors are used to control and balance electrical power traveling through the regional grid.
Transformers raise or lower the voltageas needed to serve the transmission circuits
Transformers raise or lower the voltageas needed to serve the transmission circuits
Inductors control andbalance electrical loads
Inductors control andbalance electrical loads
1
Capacitors controland store voltageCapacitors controland store voltage
2 8
Switchgear helps regulateand protect electrical equipment
Gas Insulated Air Insulated
Switchgear helps regulateand protect electrical equipment
4 6 5 9 10 1173 2 + 8 CAPACITOR
Used to control the level of voltage supplied to the customer by compensating for the voltage loss in the electrical system.
Transformers raise or lower the voltageas needed to serve the transmission circuits
Transformers raise or lower the voltageas needed to serve the transmission circuits
Inductors control andbalance electrical loads
Inductors control andbalance electrical loads
1
Capacitors controland store voltageCapacitors controland store voltage
2 8
Switchgear helps regulateand protect electrical equipment
Gas Insulated Air Insulated
Switchgear helps regulateand protect electrical equipment
4 6 5 9 10 1173
Transformers raise or lower the voltageas needed to serve the transmission circuits
Transformers raise or lower the voltageas needed to serve the transmission circuits
Inductors control andbalance electrical loads
Inductors control andbalance electrical loads
1
Capacitors controland store voltageCapacitors controland store voltage
2 8
Switchgear helps regulateand protect electrical equipment
Gas Insulated Air Insulated
Switchgear helps regulateand protect electrical equipment
4 6 5 9 10 11733 - 7 SWITCHGEAR
A switchgear is like a power switch. These switches will help regulate, protect, and control electrical equipment.
Transformers raise or lower the voltageas needed to serve the transmission circuits
Transformers raise or lower the voltageas needed to serve the transmission circuits
Inductors control andbalance electrical loads
Inductors control andbalance electrical loads
1
Capacitors controland store voltageCapacitors controland store voltage
2 8
Switchgear helps regulateand protect electrical equipment
Gas Insulated Air Insulated
Switchgear helps regulateand protect electrical equipment
4 6 5 9 10 1173
Transformers raise or lower the voltageas needed to serve the transmission circuits
Transformers raise or lower the voltageas needed to serve the transmission circuits
Inductors control andbalance electrical loads
Inductors control andbalance electrical loads
1
Capacitors controland store voltageCapacitors controland store voltage
2 8
Switchgear helps regulateand protect electrical equipment
Gas Insulated Air Insulated
Switchgear helps regulateand protect electrical equipment
4 6 5 9 10 1173 TRANSFORMERA device used to raise or lower the voltage as needed to serve the transmission or distribution circuits. Transformers consist of two or more coils of conducting material, such as a wire, wrapped around a core (often made of iron).
9 - 11
1 115 kV Inductors2 13.8 kV Capacitor3 115 kV Gas Insulated Switchgear4 230 kV Gas Insulated Switchgear5 15 kV Air Insulated Switchgear6 115 kV Gas Insulated Switchgear
7 26 kV Air Insulated Switchgear8 26 kV Capacitor9 230 kV to 115 kV Oil Transformer10 115 kV to 26 kV Oil Transformer11 115 kV to 13.8 kV Oil Transformer
DID YOU KNOW?The substation will
provide enough electricity to power two
SeaTac airports.
Denny Substation Project
VISIT OUR WEBSITE:
www.seattle.gov/light/dennysub
SEND US AN EMAIL:
CALL OUR HOTLINE:
(206) 257-2142
FOLLOW US ON FACEBOOK:
www.facebook.com/dennysubstationproject
FOLLOW US ON TWITTER:
@dennysubstation
FOLLOW US ON INSTAGRAM:
@dennysubstation
The Denny Network is being built to distribute more reliable power to City Light high-use customers. In fall 2015, network construction will begin on South Lake Union and Denny Triangle streets. Typical impacts will include daytime and nighttime work, parking restrictions, transit and pedestrian detours, dust and noise. There will be lane restrictions and street detours, but streets will typically remain open to traffic during construction. More detailed construction information will become available after a contractor has been selected in late July. Stay up to date on project information by visiting our website and signing up for project emails.
STARTING FALL 2015DENNY NETWORK CONSTRUCTION
WHAT’S AHEAD:
Fall 2015: Denny Network construction begins
Early 2016: Denny Substation construction begins
Mid-2018: Construction of Phase 1 complete
5
DENNYSUBSTATION
8TH AVE
8TH AVE9TH AVE
BOREN AVETERRY AVE
7TH AVE6TH AVE
5TH AVE
4TH AVE 9TH AVE S
BOREN AVE
8TH AVE S
7TH AVE S
6TH AVE S
PINE ST
PIKE ST
STEW
ART ST
STEWART ST
LENORA ST
LENORA ST
VIRGINIA
STBLANCHARD ST
BELL ST
OLIVE WAY
MERCER ST
VALLEY ST VALLEY ST
ALOHA STALOHA ST
WARD ST
FAIR
VIEW AVE NLAKE UNION
MERCER ST
REPUBLICAN ST
HARRISON ST
DENNY WAY
THOMAS ST
JOHN ST
FAIRVIEW
AVE N
THOMAS ST
WESTLA
KE AVE
ROY STROY ST
WESTLA
KE AVE N
WESTLAKE AVE N
9TH AVE N
9TH AVE N
8TH AVE N
BROAD STD
EXTER AVE N
Denny Network Map TERRY AVE N
BOREN
AVE N
YALE AVE N
MINOR AVE
YALE AVE
DENNY PARK
MIN
OR
AVE N
MELRO
SE AVE E
PON
TIUS AVE N
CASCADEPLAYGROUND
CASCADEP-PATCH
HOWELL
ST
Ramps to and from I-5
7THAVE3RD AVE
Legend
Denny Network
Milestone
KEY:
2012 2013 2014 2015 2016
SEPA Process Public Scoping
Draft EIS Final EIS
Community Involvement
Distribution Network
Civil Construction
Electrical Construction
Denny Substation
*Schedule is current as of July 2015
Denny SubstationDesign
2017 2018
Construction
Distribution Network