Sea Breeze PacificSea Breeze PacificRegional Transmission SystemRegional Transmission System

Juan de Fuca CableJuan de Fuca Cable&&

West Coast CableWest Coast Cable

Keys to West Coast Keys to West Coast Transmission ProgressTransmission Progress

BCTC system studiesBCTC system studies - Feasibility - Feasibility CompletedCompleted- Combined Interconnection- Combined Interconnection and Facilities studies agreement and Facilities studies agreement In negotiation In negotiation

BPA system studiesBPA system studies - Feasibility - Feasibility CompletedCompleted- Interconnection- Interconnection CompletedCompleted- Facilities- Facilities CompletedCompleted

WECC Path Rating ProcessWECC Path Rating Process- Phase II Target Date - Phase II Target Date Q2 - 2007 Q2 - 2007

Electrical System StudiesElectrical System Studies

• Blaine Intertie: Increased Headroom (~300MW)

• Vancouver Island: Improved Reliability

• British Columbia:

• Washington “I-5” Utilities:

Improved Access to Market

• Regional Benefits: Deferred Capital Expenditures(e.g. Monroe-Echo Lake $400M)

Relieved Congestion/ Downstream Benefits Return

• Olympic Peninsula: Improved Reliability

Anticipated System Benefits

Access to Canadian Access to Canadian RenewablesRenewables

Preliminary Plan of Service WCCPreliminary Plan of Service WCC

• Basic Components of WCC Basic Components of WCC – 1600 MW converter station 1600 MW converter station

at BPA’s Allston at BPA’s Allston Substation.Substation.

– 2-650 mile undersea DC 2-650 mile undersea DC cables (1 per pole)cables (1 per pole)

• Upgrades North of AllstonUpgrades North of Allston• Rough Cost: $1.9 - 2.3 Rough Cost: $1.9 - 2.3

Billion, plus the cost of Billion, plus the cost of upgrades north of Allstonupgrades north of Allston

OLINDA

OLYMPIA

FAIRMONT

RAVER

MONROE

INGLEDOW

PAUL

OSTRANDER

MARION

MALIN

TRACY

GRIZZLY

JOHN DAY

HANFORD

BELL

COULEE

NICOLA

PEACE RIVER

FORT MCMURRAY

LANGDON

GARRISON

MIDPOINT

MICA

REVELSTOKE

SELKIRK

ASHE

TAFT

BIG EDDY

TESLA

MCNARY

MERIDIAN

KELLY LAKE

SITE C

KITIMAT

DUNSMUIR

BORAH

CHEEKYE

CRANBROOK

SUMMER LAKE

ROUND BUTTE

TO SYLMAR

TO LAS VEGAS

EDMONTON

SF AREA

ALLSTON DWORSHAK

ROUND MOUNTAIN

SCHULTZ

ALVEY

WILLISTON

VASEUX LK

TOWNSEND

Figure 1: West Coast Cable HVDC Project

WCC HVDC

Olympic Peninsula Reinforcements

Juan de Fuca HVDC

Terminating OVHD HVDC with Large VSC InvertersTerminating OVHD HVDC with Large VSC Inverters

HVDC InverterLimitations on recovery rate from ac faults

due to inverter voltage stabilityLimitations on power rating due to system

strengthReactive power constraints

Momentary interruption of power flow due to ac fault induced CF at inverter

HVDC Light InverterImproved voltage stability

Less limitations on inverter rating, recovery rate and system strength

Improved multiple-infeed performanceNo reactive power constraintsDistributed inverters to reduce

interconnection requirements

Photo courtesy of ABBPhoto courtesy of ABB

State-of-the-art enhancement of well proven HVDC transmission technology

West Coast Cable ProjectWest Coast Cable Project

We expect both the JdF and West Coast Cable Projects to provide significant benefits to the electrical system in the Puget Sound area and the larger Northwestern Region, as well as access to coastal BC renewable resources.

We expect both the JdF and West Coast Cable Projects to provide significant benefits to the electrical system in the Puget Sound area and the larger Northwestern Region, as well as access to coastal BC renewable resources.

SummarySummary