June
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SHARYLANDLOMAALTAHVDCPROJECT
CONFIDENTIALSTRATEGICPROJECTSB&VENERGY
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ContentsHVDCTechnologyCostEstimates&ScheduleConclusions&NextSteps
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HVDCTECHNOLOGY
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Technology:WhyHVDC?
Powerflowiscontrollable BypassescongestedACcircuitsw/oinadvertentflow
BipoleDCperformssimilartodblckt AClineundercontingencies
Protectsagainstcascadingoutages Powerflowcanbemaintainedatreducedlevelsduringlossofonepolebyswitchingtomonopolewithmetallicreturn
Cancarrymorepowerwithreducedlossesforagivensizeofconductor
LowercostperMWofdeliveredcapacity($/MW)forlargesystems
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Technology:VoltageSourceConverters VSCmarketedasHVDCLightbyABBandasHVDCPlusbySiemens
InsulatedGateBipolarTransistor(IGBT)technologydoesnotrequirestrongACsourcesforcommutation
LowShortCircuitratiorequirements Doesnothaveminimumtransferrequirements Minimalfilteringisrequiredattheterminals Smallerterminalfootprintandeasiertoharden toimprovereliability
Presenttechnologybeingusedonundergroundandsubmarinelinesbuthaslimiteduseandexperienceonoverheadlines
Allowsuseofsoliddielectriccabletechnologyforsubmarinecables
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Technology:ClassicHVDC
Extensivetrackrecordupto800kV ConverterterminalstypicallylessexpensivethanVSCterminalsbutreactivecompensationrequirementsdriveupcosts
ThyristorvalvetechnologyrequiresstrongACsourcesforcommutation
HigherShortCircuitratiorequirementsoftenresultinginneedforsynchronouscondensersorotherdevices
Minimumtransferrequirements Filteringrequiredattheterminals Largefootprintrequiredatterminals
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Technology:WhyMetallicReturn? Improvedoperationalreliabilityandflexibility Bipoleoperationdoesnotrequireseparatereturnpath;monopoleoperationwillrequirereturnpath
Sustaineduseofearthreturnduringmonopoleoperationoftennotpermittedforenvironmentalreasons(e.g.impactonotherburiedutilities)
Plannedevents,suchasplannedmaintenance,requiringsustainedmonopoleoperationmayusemetallicreturn
MetallicreturnconfigurationachievedbycontrolledswitchingproceduresMetallicreturncanincludeaseparatereturnconductororcanbeimplementedbyswitchingtotheremainingunusedpoleifserviceable
Unplannedeventsmayuseearthreturnforinitialperiod(minutes)andthenswitchtometallicreturn(hourstoweeks)
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Technology:ExampleSubmarineProjects
ProjectName: CrossSoundLocation: NewYork Conn.Voltage: 150kVHVDCCapacity: 330MWTechnology: ABBHVDCLight(VSC)SeaRoute: 25milesLandRoute: 1mileProjectStatus: Incommercialoperation
since2002
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Technology:ExampleSubmarineProjects
ProjectName: TransBayLocation: SanFranciscoBayVoltage: 200kVHVDCCapacity: 400MWTechnology: SiemensHVDCPlus(VSC)SeaRoute: 53milesLandRoute: 1mileProjectStatus: Incommercialoperation
since2010
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Technology:ExampleSubmarineProjects
ProjectName: BorWin1Location: NorthSeaVoltage: 150kVHVDCCapacity: 400MWTechnology: ABBHVDCLight(VSC)SeaRoute: 77milesLandRoute: 46milesProjectStatus: Incommercialoperation
since2009
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Technology:ExampleSubmarineProjects
ProjectName: DolWin1Location: NorthSeaVoltage: 320kVHVDCCapacity: 800MWTechnology: ABBHVDCLight(VSC)SeaRoute: 46milesLandRoute: 56milesProjectStatus: 2013Completion
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Technology:ExampleSubmarineProjects
ProjectName: SylWin1Location: NorthSeaVoltage: 320kVHVDCCapacity: 864MWTechnology: SiemensHVDCPlus(VSC)SeaRoute: 99milesLandRoute: 28milesProjectStatus: 2014Completion
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Technology:ExampleSubmarineProjects
ProjectName: MAPPLocation: ChesapeakeBayVoltage: 320kVHVDCCapacity: 2000MWTechnology: ABBHVDCLight(VSC)SeaRoute: 39milesLandRoute: 44milesProjectStatus: 2015Completion
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Technology:ExampleSubmarineProjects
ProjectName: AtlanticWindConnection
Location: MidAtlanticCoastVoltage: 320kVHVDCCapacity: 7000MW(total)
2000MW(maxperprojectphase)
Technology: VSCSeaRoute: ~600milesLandRoute: ~50milesProjectStatus: 20162020
StagedCompletion
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Technology:SubmarineCableInstallationCableLaying CableBurialPlowing
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COSTESTIMATES&SCHEDULE
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OrderofMagnitudeCostEstimates
Costestimatesinclude:HVDCconverterstationsACsubstationsadjacenttoeachconverterstationSynchronouscondensersatsouthernterminalforHVDCClassicLatticetowerstructuresand2conductorsperpoleonoverheadoption1cableperpoleonunderground/submarineoptionMetallicneutralcable
Costestimatesdonotinclude:UpgradestoexistingsystemnotincludedinthereportCostofremoteinterconnectionCostofrightofway/siteOwnerscosts Development/permittingcosts
CCNProcess Financingcosts Constructionmanagement
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EstimatedProjectCost OverheadOptionVSC Technology HVDC Classic
GeneralPeak Delivered Power (MW) 1000 1000Line Voltage +/- 320 kV HVDC +/- 400 kV HVDCMiles of Bipole HVDC Overhead Lines 220 220
Line RatingLine Losses at Peak Line Loading 3.2% 2.0%Terminal Losses at Peak Load (2 Terminals) 2.0% 1.5%Total Peak Losses 5.2% 3.5%Conductor Rating (MW) 1,052 1,035Conductor Size Per Pole (2) 1943 TWD (2) 1943 TWD
Total Project Capital CostsBipole HVDC Overhead Lines ($M) $264 $266Two HVDC Converter Stations ($M) $300 $260AC Substations ($M) $40 $40Reactive Compensation [Synch. Cond.] ($M) $0 $60System Impacts ($M) TBD TBD
Total Capital Cost ($M) $604 $626
Capital Cost per MW of Delivered Capacity ($/MW) $604,000 $626,000
Furthercostoptimizationofconverterswouldreduceprojectcost
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EstimatedProjectCost SubmarineOptionGeneral
Peak Delivered Power (MW) 1000Line Voltage +/- 320 kV HVDCMiles of Alignment 160Miles of Bipole HVDC Submarine Lines 150Miles of Bipole HVDC Underground Lines 10
Line RatingLine Losses at Peak Line Loading 5%Terminal Losses at Peak Load (2 Terminals) 2%Total Peak Losses 7%Cable Rating (MW) 1,070Submarine Cable Size Per Pole (1) 2400 mm CUUnderground Cable Size Per Pole (1) 2500 mm CU
Total Project Capital CostsBipole HVDC Submarine Lines ($M) $525Bipole HVDC Underground Lines ($M) $45Two HVDC Converter Stations ($M) $300AC Substations ($M) $41System Impacts ($M) TBD
Total Capital Cost ($M) $911
Capital Cost per MW of Delivered Capacity ($/MW) $911,000
Furthercostoptimizationofconverterswouldreduceprojectcost CablecostsbasedonlongestdistancetoNorthernTerminal
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HighLevelSchedule OverheadOption
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Detailed Design
Equipment & Material Procurement
Preliminary Design and Studies
Preliminary Project Approvals
EIS Activities
Land Rights
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Project Definition
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HighLevelSchedule SubmarineOption
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Project Definition
Preliminary Design and Studies
Preliminary Project Approvals
EIS Activities
Land Rights
Detailed Design
Equipment & Material Procurement
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CONCLUSIONS&NEXTSTEPS
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Conclusions BothSubmarineandOverheadOptions:
Providefullycontrollable1,000MWcapability,andabilitytomanagecongestedACcircuits
Protectsagainstcascadingoutages Cancarrymorepowerwithreducedlossesforagivensizeofconductor
LowercostperMWofdeliveredcapacity($/MW)forlargesystems
SubmarineOption:MostreliablealternativetoERCOTforcoastalregionMostreliablealternativetoERCOTforcoastalregionHVDC/VSCisthepreferredchoiceforsubmarinetransferofHVDC/VSCisthepreferredchoiceforsubmarinetransferof1000MW1000MW
GridconnectedHVDCoptionsatLomaAlta,Pawnee,andCorpusChristiarea(WhitePoint,LasBrisas orBarneyDavis)appeartobeviable
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NextSteps
RecommendERCOTtoperformUPLANbasedeconomicassessment IdentifyproductioncostsavingsfollowingincorporationHVDClinevs.ACsolutions
ReviewPowerSystemStudiestodetermineoptimalcapacityandperformancerequirements ACpowerflowanalysis Reactivepowerrequirementsofexistingsystem Assessmostviabletechnology(HVDCorHVDClight)forPawneeproject
DynamicandSSTIAnalysis Performfield/routeconstraintsreviewandupdatepreliminaryrouteandpermittingrequirements
Updatecostestimates
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AppendixMaps
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