quarterly report - seattle · quarterly report denny substation ... 3 4 6 gas insulated 5 7 air...

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

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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


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


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.





1


2 8




4 6 5 9 10 1173





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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.





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4 6 5 9 10 1173





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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:

[email protected]

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

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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

quarterly report - seattle · quarterly report denny substation ... 3 4 6 gas insulated 5 7 air...

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