Annual Planning Report 2012 - Transpower

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Chapter 6: Grid Backbone6.3.2 Future North Island grid backboneFigure 6-2 and Figure 6-3 provide an indication of the North Island transmissionbackbone development in the medium term (the next 15 years), and longer term(beyond 2027), respectively.We are building a new double-circuit transmission link from Whakamaru to Auckland,and a new double-circuit transmission line between Wairakei and Whakamaru.We have submitted an Investment Proposal to the Commerce Commission to replaceconductor on the existing 220 kV transmission lines between Bunnythorpe andHaywards. A consequence of the replacement will be to increase capacity on theselines.We will also investigate an increase in transmission capacity north of Bunnythorpe,either through the Central North Island to Whakamaru, and/or through the Taranakiregion and a new line to Whakamaru.In the longer term, we may increase the transmission capacity through the NorthIsland by increasing the operating voltage on the new overhead transmission line intoAuckland to 400 kV. Ultimately we may build a new transmission line connectingBunnythorpe, Whakamaru, and Auckland, but this is highly dependent on future loadand generation growth, and the viability of alternatives.We will also be looking to provide substation diversity at some critical transmissionnodes and strengthen resilience to high impact low probability events.Voltage stability in the Upper North Island is an ongoing issue. We will continue tostudy the additional reactive support requirements to maintain Upper North Islandvoltage stability as regional load continues to grow.2012 Annual Planning Report © Transpower New Zealand Limited 2012. All rights reserved. 43
Chapter 6: Grid BackboneFigure 6-2: Indicative North Island grid backbone schematic to 2027OtahuhuPakurangaGlenbrookTakaniniDruryBrownhill** new double circuit transmission line constructed for400 kV operation but initially operated at 220 kV.OhinewaiHuntlyHamiltonTe KowhaiWhakamaru BAtiamuriOhakuriTaumarunuiTokaanuWhakamaru ATe MihiPoihipiWairakeiRangipoStratfordTangiwaiBrunswickBunnythorpeLintonKEYNEW ASSETSUPGRADED ASSETSHaywardsWilton442012 Annual Planning Report © Transpower New Zealand Limited 2012. All rights reserved.
Page 2: ForewordForeword to the Annual Plan
Page 6 and 7: Executive SummarySummary Figure 1:
Page 8 and 9: Executive SummaryFeedbackWe will be
Page 10 and 11: Table of contents2012 Annual Planni
Page 12: Chapter 1: Introduction1 Introducti
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Chapter 7: Northland RegionSolution
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Chapter 7: Northland Regiona shared
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Chapter 7: Northland RegionSolution
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Chapter 7: Northland RegionThe peak
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Chapter 7: Northland RegionTable 7-
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Chapter 7: Northland RegionBoth 110
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Chapter 8: Auckland Region8 Aucklan
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Chapter 8: Auckland Region8.2.1 Tra
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Chapter 8: Auckland Regionor demand
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Chapter 8: Auckland RegionFigure 8-
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Chapter 8: Auckland RegionTable 8-3
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Chapter 8: Auckland RegionFigure 8-
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Chapter 8: Auckland RegionNorth Auc
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Chapter 8: Auckland RegionIn additi
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Chapter 8: Auckland RegionSee also
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Chapter 8: Auckland RegionTable 8-1
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Chapter 8: Auckland Region8.10.2 Au
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Chapter 9: Waikato RegionThe Waikat
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Chapter 9: Waikato Region668 MW by
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Chapter 9: Waikato RegionTable 9-3:
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Chapter 9: Waikato Region9.8 Waikat
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Chapter 9: Waikato Regionfull gener
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Chapter 9: Waikato Regiona total no
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Chapter 9: Waikato RegionTable 9-11
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Chapter 9: Waikato RegionIssueTwo 1
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Chapter 9: Waikato RegionTable 9-15
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Chapter 9: Waikato Regionproposing
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Chapter 10: Bay of Plenty RegionThe
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Chapter 10: Bay of Plenty RegionFig
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Chapter 10: Bay of Plenty RegionInd
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Chapter 10: Bay of Plenty RegionOut
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Chapter 10: Bay of Plenty RegionFol
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Chapter 11: Central North Island Re
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Chapter 12: Taranaki Region12 Taran
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Chapter 12: Taranaki RegionWe have
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Chapter 12: Taranaki Regionand expo
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Chapter 12: Taranaki RegionFigure 1
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Chapter 12: Taranaki RegionTable 12
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Chapter 12: Taranaki Regiondepends
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Chapter 13: Hawke’s Bay RegionThe
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Chapter 13: Hawke’s Bay RegionFig
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Chapter 14: Wellington RegionThe We
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Chapter 14: Wellington RegionDescri
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Chapter 14: Wellington Region14.8 W
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Chapter 14: Wellington RegionThe tw
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Chapter 14: Wellington Region14.8.8
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Chapter 14: Wellington Regionn-1 ca
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Chapter 15: Nelson-Marlborough Regi
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Chapter 16: West Coast RegionThe We
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Chapter 16: West Coast Regionapprop
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Chapter 16: West Coast Region16.6 F
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Chapter 16: West Coast RegionSoluti
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Chapter 16: West Coast RegionIndica
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Chapter 16: West Coast Regionstage
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Chapter 17: Canterbury RegionThe Ca
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Chapter 17: Canterbury RegionFigure
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Chapter 17: Canterbury RegionTable
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Chapter 17: Canterbury RegionTwo 66
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Chapter 17: Canterbury RegionIsling
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Chapter 18: South Canterbury Region
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Chapter 19: Otago-Southland Region1
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Chapter 19: Otago-Southland RegionL
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Chapter 19: Otago-Southland RegionG
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Chapter 19: Otago-Southland RegionD
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Chapter 19: Otago-Southland RegionW
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Chapter 19: Otago-Southland RegionW
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Chapter 19: Otago-Southland RegionI
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Chapter 19: Otago-Southland RegionT
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Appendix A: Grid Reliability Report
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Appendix B: Grid Economic Investmen
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Appendix C: Fault LevelsAppendix CF
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Appendix C: Fault LevelsGrid exit p
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Appendix D: Project CalendarTable D
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Appendix D: Project CalendarForecas
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Appendix E: Investment Approvals Pr
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Appendix F: Grid Support ContractsF
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Appendix F: Grid Support ContractsF
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Appendix G Generation ScenariosAppe
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Appendix G Generation ScenariosYear
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MWAppendix G Generation Scenarios14
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MWAppendix G Generation ScenariosYe
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MWAppendix G Generation ScenariosG.
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MWAppendix G Generation ScenariosIn
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MWMWMWAppendix G Generation Scenari
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Appendix H: Project NamingAppendix
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Appendix I: GlossaryAppendix IGloss
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Appendix I: GlossaryTermgeneratorgr
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Appendix I: GlossaryTermsteady stat
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Appendix J: Grid Exit and Injection
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