![Page 1: Puget Sound Energy Columbia Grid Presentation June 19, 2007 John Phillips](https://reader033.vdocuments.net/reader033/viewer/2022061616/56649e795503460f94b79190/html5/thumbnails/1.jpg)
Puget Sound EnergyColumbia Grid PresentationJune 19, 2007John Phillips
![Page 2: Puget Sound Energy Columbia Grid Presentation June 19, 2007 John Phillips](https://reader033.vdocuments.net/reader033/viewer/2022061616/56649e795503460f94b79190/html5/thumbnails/2.jpg)
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PSE Strategy
Meet service obligations Follow best practices for reliable, cost
efficient system Work collaboratively with stakeholders Consider all alternatives (single utility)
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Areas of Concern
Transmission capacity for Whatcom and Skagit Counties
King County capacity Cross Cascade capacity Transmission capacity for Pierce and
Thurston Counties
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BPA’s 500 kV
Monroe – Echo Lake
Winter/Spring Power Flow
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BPA’s 500 kV
Monroe – Echo Lake
Summer/Fall Power Flow
Raver - Paul
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Whatcom/Skagit Counties
South of Sedro Cut Plane operational limits Can be limiting S-N and N-S with single 230kV
line outages
New service needs New resources being proposed in US and
Canada
Changing generation and industrial loads
BPA and Snohomish in parallel
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Identified Alternatives
Sedro-Horse Ranch #2 230kV line Rebuild 30 miles of existing 115kV Utilizes existing ROW Adds third 230kV line across South of Sedro
Cutplane
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King County
Monroe-Echo Lake Cutplane BPA internal cutplane Operational limitations Highest PSE load density
North of Covington Operational limitations Growing load service needs
BPA, SCL, and Snohomish in parallel
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Monroe-Echo Lake Alternative
Sammamish-Lakeside-Talbot 230kV line Rebuild 16 miles of existing 115kV Utilize existing ROW Adds fourth 230kV line across Monroe-Echo
Lake Provide load service to North King County
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North of Covington
Covington-Berrydale 230kV project scheduled for 2008
Relieves operational limits north of Covington
Provides loop feed to PSE loads at Berrydale and Talbot
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500 KV
345 KV
N.O.
N.O.
N.O.
N.O.
230 KV
BPAMAPLE VALLEY230 KV
SCL
TALBOT
Talbot North
Talbot South
To115 kV
gridO’BRIEN
BERRYDALE
BPA COVINGTON
500 KV 500 KV
230 KV
TO TACOMA
Existing
Proposed for this project
EastBus
WestBus
Bundle 4 spans 1590 Lapwing
Existing double circuit Lapwing Extend double
circuit Lapwing
New double circuit Falcon
Future
To115 kV
grid
To115 kV
grid
To115 kV
grid
Covington – Berrydale Add 230 kV Line
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Cross-Cascades
New PSE owned wind generation in Eastern Washington
More eastern renewables expected as part of state initiative
Growing Puget Sound Load Usage change in Westside resources to
firm renewables BPA in parallel and preliminary studies are
underway
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Identified PSE Alternative
Conversion of I.P. 115kV line to 230kV Adds new 230kV line across Cascades Directly connects to wind resources Improves load service to Kittitas County Mostly on existing R.O.W.
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IP Cut-Over to 230 kV
To Rocky Reach
Kittitas12.5 kV
Hyak12.5 kV
IP 230 kV Line
Rockdale12.5 kV Easton
12.5 kVWoldale34.5 kV
Wanapum230 kV
45 MVAr
Wild Horse
BaldiWhite River
Sammamish
Maple Valley
LakeTradition
230 kV
115 kV
230 kV
Twin Falls
Cle Elum34.5 kV
230 kV
Cascade34.5 kV
Dashed are future facilities
Wind Ridge
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Pierce and Thurston Counties
New load growth pushing 230/115kV transformation capacity
Raver-Paul cutplane impacts BPA and Tacoma Power in parallel
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Pierce County Alternative
Add 230/115kV transformer at Alderton Substation
230kV source from White River or BPA Interconnection studies initiated with BPA
Provides load service to south King & Pierce Counties
Relieves Raver-Paul 115kV constraints north of Alderton
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Baldi
BPA CovingtonWhite River
Starwood
KrainCorner
Alderton
Frederick
Tacoma S.
Tacoma N.
ElectronHeights
BPAPaul
Tono
Blumaer
St Clair
GravellyLake
To BPA Olympia
To Chehalis
To BPA Grand Coulee
Raver500 kV
230 kV
500 kV
230 kV
RaverSouthInterface
287 kV
115 kV
115 kV
115 kV
230
kV
115 kV
115 kV
115 kV
115 kV
115 kV
55 kV
115 kV 230 kV
230 kV
230 kV
To West Olympia 55 kV
230 kV
500
kVTo Olympia
115 kV
Proposed for this project
Future
Existing
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Thurston County Alternative
Add 230/115kV transformer at Saint Clair or Spurgeon Creek (pending site adequacy review)
230kV source from BPA Interconnection studies being initiated with
BPA
Provides load service to south Thurston County
Relieves BPA Olympia and Tono loading
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BPA Paul
Tono
Blumaer
St Clair
GravellyLake
Chehalis500 kV
115 kV
115 kV
115 kV
West Olympia
Olympia
Plum Street
Pleasant Glade
Airport
BPA Olympia
BPATono
115 kV
115 kV
115 kV
115 kV
500 kVTo Electron Heights
287 kV
500 kV To Raver287 kV
To BPA Grand Coulee
115 kV
To Frederickson
230 kVTo Tacoma N.
To Tacoma S.230 kV
Proposed for this project
Existing
230 kV
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Additional 115kV Projects Reconductor Bellingham-Sedro Woolley
115kV lines Ties between Whatcom and Skagit Counties 4/0 CU to 1272 Bittern
Novelty 230/115kV transformer Load service to north King County
Woodland-St Clair 115kV project Adds 3rd 115kV line between Pierce and
Thurston Counties. (contingent on Timing of 230 kV projects)