132 KV Transmission System Australia

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  • ElectraNet Corporate Headquarters 52-55 East Terrace, Adelaide, South Australia 5000 PO Box, 7096, Hutt Street Post Office, Adelaide, South Australia 5000

    Tel: (08) 8404 7966 Fax: (08) 8404 7104 Toll Free: 1800 243 853

    Templers Supply Augmentation Regulatory Test Application Notice

    October 2009

    Version 1.1

  • TEMPLERS SUPPLY AUGMENTATION October 2009

    ElectraNet Pty Ltd

    Copyright and Disclaimer

    This Application Notice has been prepared for the purposes of clause 5.6.6 of the National Electricity Rules. It may be used by Registered Participants and interested parties only for the purposes of the consultation process under that clause. This Application Notice should not be used or relied on for any other purposes. The contents of this Application Notice may differ from the contents of the preceding application notice.

    This Application Notice contains analysis based on estimates prepared by, and assumptions made by, ElectraNet and ETSA Utilities. The document has also been prepared using information, including cost information, provided by a number of third parties. The cost estimates used to evaluate the options described are based on the best information available to ElectraNet and ETSA Utilities at the time of preparing the report and should not be taken as necessarily reflecting the actual costs of later implementing an option.

    The Application Notice contains the results of financial modelling and economic analysis undertaken by ElectraNet and ETSA Utilities. It contains assumptions regarding, among other things, economic growth and load forecasts that may or may not prove to be correct.

    While care was taken in preparation of the information in this Application Notice, and it is provided in good faith, neither ElectraNet nor ETSA Utilities warrant the accuracy of the contents of this Application Notice, and so far as the law allows accept no responsibility or liability for any loss or damage that may be incurred by any person acting in reliance on this Application Notice or assumptions drawn from it.

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    t.

  • TEMPLERS SUPPLY AUGMENTATION October 2009

    ElectraNet Pty Ltd Page 1 of 67

    Contents

    EXECUTIVE SUMMARY .......................................................................................................3

    1. INTRODUCTION ........................................................................................................4

    2. BACKGROUND: ELECTRICITY SUPPLY SYSTEM ...............................................5

    2.1 GEOGRAPHIC AREA .......................................................................................................... 5

    2.2 EXISTING SUPPLY ARRANGEMENTS ................................................................................... 5

    2.3 COMMITTED NETWORK DEVELOPMENTS ............................................................................ 5

    2.4 EXISTING AND COMMITTED GENERATION FACILITIES........................................................... 5

    3. BACKGROUND: ELECTRICITY DEMAND..............................................................8

    3.1 OVERVIEW........................................................................................................................ 8

    3.2 LOAD FORECAST .............................................................................................................. 8

    3.3 PATTERN OF USE............................................................................................................11

    4. ELECTRANETS SERVICE OBLIGATIONS ...........................................................13

    4.1 NATIONAL ELECTRICITY RULES........................................................................................13

    4.2 SOUTH AUSTRALIAN ELECTRICITY TRANSMISSION CODE ..................................................13

    5. PROJECTED NETWORK LIMITATIONS ................................................................16

    5.1 VOLTAGE LIMITATIONS AT TEMPLERS AND DORRIEN..........................................................16

    5.2 THERMAL RATING OF THE 132 KV TRANSMISSION SYSTEM ................................................17

    6. ADDRESSING LIMITATIONS: OPTIONS CONSIDERED ......................................19

    7. TECHNICAL DETAILS ............................................................................................20

    7.1 FUTURE NETWORK DEVELOPMENTS MID NORTH REGION ..............................................20

    7.2 OPTION 1 TEMPLERS WEST 275/132 KV SUBSTATION...................................................21

    7.3 OPTION 2 CAPACITOR BANKS AT TEMPLERS FOLLOWED BY 132 KV REINFORCEMENT ......28

    7.4 OPTION 3 GENERATION SUPPORT FOLLOWED BY 275/132 KV INJECTION AT TEMPLERS WEST............................................................................................................34

    8. SCENARIOS CONSIDERED ...................................................................................43

    8.1 CONTEXT FOR EVALUATION OF OPTIONS..........................................................................43

    8.2 ASSUMED MARKET DEVELOPMENT SCENARIOS................................................................43

  • TEMPLERS SUPPLY AUGMENTATION October 2009

    ElectraNet Pty Ltd

    Page 2 of 67

    9. FORMAT AND INPUTS TO ANALYSIS ..................................................................45

    9.1 REGULATORY TEST REQUIREMENTS................................................................................45

    9.2 INPUTS TO ANALYSIS.......................................................................................................45

    9.3 COST OF NETWORK AUGMENTATIONS..............................................................................45

    9.4 OTHER INPUTS TO ANALYSIS ...........................................................................................45

    10. ECONOMIC ANALYSIS...........................................................................................47

    10.1 OTHER INPUTS TO ANALYSIS ...........................................................................................47

    10.2 RESULTS OF ANALYSIS....................................................................................................47

    10.3 SENSITIVITY ANALYSIS ....................................................................................................48

    10.4 INTER-NETWORK IMPACT.................................................................................................49

    11. CONSTRUCTION TIMETABLE AND COMMISSIONING DATE.............................50

    12. COMPLIANCE WITH SERVICE OBLIGATIONS ....................................................51

    13. SUMMARY AND CONCLUSIONS...........................................................................52

    14. DRAFT RECOMMENDATION .................................................................................53

    15. CONSULTATION .....................................................................................................54

    16. GLOSSARY .............................................................................................................55

    APPENDIX A NPV ANALYSIS LOW GROWTH SCENARIO..........................................57

    APPENDIX B NPV ANALYSIS MEDIUM GROWTH SCENARIO....................................60

    APPENDIX C NPV ANALYSIS HIGH GROWTH SCENARIO .........................................63

  • TEMPLERS SUPPLY AUGMENTATION October 2009

    ElectraNet Pty Ltd

    Page 3 of 67

    Executive Summary

    ElectraNet is required to meet the supply reliability standards and quality of supply standards specified in the South Australian Electricity Transmission Code (ETC) and National Electricity Rules (NER) respectively.

    ElectraNet has identified emerging limitations within the transmission system that supplies the Templers, Dorrien and Roseworthy connection points, referred to as the Barossa area of the Mid-North region of South Australia within this Application Notice. As a consequence of ongoing load growth within the Barossa area, ElectraNet will be unable to satisfy the NER requirement to maintain adequate voltages under peak load contingency conditions at the Templers, Dorrien and Roseworthy connection points without interrupting load after the summer of 2009/10.

    In addition, the 1 July 2008 Electricity Transmission Code upgraded the reliability standard that applies to the Templers and Dorrien connection points. The upgraded standard requires continuous N-1 transmission line and transformer capacity into the Templers and Dorrien connection points by no later than 30 June 2011. Therefore, interruption of supply at either of these connection points as a result of a single contingency will no longer be acceptable.

    In order to resolve these limitations, ElectraNet has developed a number of potential solutions and applied the Regulatory Test for reliability augmentations to determine the least cost net present value solution. From this assessment, the recommendation of this Application Notice that a new 275/132 kV substation, to be known as Templers West, be established adjacent to ElectraNets existing Templers 132/33 kV substation at an estimated cost of $36.6m. This substation would feed directly into the existing Dorrien 132/33 kV substation by modifying the existing Roseworthy Dorrien 132 kV transmission line.

  • TEMPLERS SUPPLY AUGMENTATION October 2009

    ElectraNet Pty Ltd

    Page 4 of 67

    1. Introduction

    ElectraNet has identified emerging limitations at the Templers and Dorrien co