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Distribution Annual Planning Report 2021 – 2025

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Distribution Annual Planning Report 2021 – 2025 Distribution Annual Planning Report 2021 – 2025 Issue number 8 Status Approved Approver Tom Langstaff Date of approval 21 December 2020 AusNet Services Distribution Annual Planning Report 2021 - 2025 ISSUE/AMENDMENT STATUS Issue Date Description Author Approved by Number 1 20/12/2013 2014-2018 Issue (First Issue) M Wickramasuriya D Postlethwaite S Lees M Cavanagh 2 19/12/2014 2015-2019 Issue S Lees J Bridge M Cavanagh 3 24/12/2015 2016-2020 Issue M Wickramasuriya J Bridge S Lees M Cavanagh 4 23/12/2016 2017-2021 Issue M Wickramasuriya J Bridge S Sao M Cavanagh 5 22/12/2017 2018-2022 Issue M Wickramasuriya J Bridge T Langstaff 6 27/12/2018 2019-2023 Issue M Wickramasuriya T Langstaff J Pollock 6.1 30/04/2019 Revision to 2019-2023 Issue to include M Wickramasuriya T Langstaff geographic areas subject to a REFCL J Pollock condition, as per Electricity Distribution S Sao Code V.9A (amended August 2018). 7 20/12/2019 2020-2024 Issue J Pollock T Langstaff A Erceg S Sao 7.1 13/01/2020 Updated RIT timeframes (Section 8.2) and J Pollock T Langstaff other minor amendments including broken A Erceg links S Sao 8 18/12/2020 2021-2025 Issue J Pollock T Langstaff S Sao D Johnstone Disclaimer This document belongs to AusNet Services and may or may not contain all available information on the subject matter this document purports to address. The information contained in this document is subject to review and AusNet Services may amend this document at any time. Amendments will be indicated in the Amendment Table, but AusNet Services does not undertake to keep this document up to date. To the maximum extent permitted by law, AusNet Services makes no representation or warranty (express or implied) as to the accuracy, reliability, or completeness of the information contained in this document, or its suitability for any intended purpose. AusNet Services (which, for the purposes of this disclaimer, includes all of its related bodies corporate, its officers, employees, contractors, agents and consultants, and those of its related bodies corporate) shall have no liability for any loss or damage (be it direct or indirect, including liability by reason of negligence or negligent misstatement) for any statements, opinions, information or matter (expressed or implied) arising out of, contained in, or derived from, or for any omissions from, the information in this document. Contact This document is the responsibility of the Regulated Energy Services Division, AusNet Services. Please contact the indicated owner of the document with any inquiries. Tom Langstaff AusNet Services Level 30, 2 Southbank Boulevard Melbourne Victoria 3006 Ph: (03) 9695 6859 ISSUE 8.0 18/12/2020 2 / 133 UNCONTROLLED WHEN PRINTED AusNet Services Distribution Annual Planning Report 2021 - 2025 Table of Contents 1 Executive Summary .......................................................................................................................... 6 2 Introduction ....................................................................................................................................... 7 2.1 Purpose .................................................................................................................................................. 7 2.2 AusNet Electricity Services Pty Ltd....................................................................................................... 7 3 Electricity Distribution Network ....................................................................................................... 8 3.1 Network Location ................................................................................................................................... 8 3.2 High Voltage Sub-Transmission Network ............................................................................................ 9 3.3 Protection ............................................................................................................................................... 9 3.4 Medium Voltage Distribution Network ................................................................................................ 10 3.5 Low Voltage Distribution Network ....................................................................................................... 13 3.6 Communications Network ................................................................................................................... 14 3.7 Distribution Asset Summary................................................................................................................ 15 3.8 Methodologies used in preparing the Distribution Annual Planning Report ..................................... 16 3.9 Significant changes in aspects of forecasts and information provided ............................................. 23 4 Forecasts for the Forward Planning Period ................................................................................. 25 4.1 Demand Forecasting Methodology .................................................................................................... 25 4.2 Spatial Demand Forecasting Process ................................................................................................ 25 4.3 Forecasting methodology planned improvements ............................................................................ 27 4.4 Network Capacitive Current Forecasting Methodology ..................................................................... 27 4.5 Network Capacitive Current Forecasts .............................................................................................. 28 4.6 Asset Loading Forecasts..................................................................................................................... 29 4.7 Asset Loading Forecasts..................................................................................................................... 38 4.8 Forecasts of the DNSP performance against STPIS reliability targets ............................................ 39 4.9 Factors that may have material impact on distribution network ........................................................ 39 5 Network Asset Retirements and De-ratings ................................................................................. 45 5.1 Individual asset retirement and de-ratings ......................................................................................... 45 5.2 Grouped asset retirement and de-ratings .......................................................................................... 45 6 System Limitations for Sub-Transmission Lines and Zone Substations .................................. 46 6.1 Sub-transmission line limitations......................................................................................................... 46 6.2 Zone substation limitations .................................................................................................................. 52 7 Overloaded Primary Distribution Feeders .................................................................................... 63 7.1 Demand reduction required to defer overload by 12 months............................................................ 64 8 Regulatory Investment Tests ......................................................................................................... 67 8.1 RIT-D projects recently completed or in progress ............................................................................. 67 8.2 Future RIT-D projects .......................................................................................................................... 67 9 Completed, Committed and Planned Zone Substation Developments ..................................... 69 9.1 Bairnsdale Zone Substation rebuild and REFCL installation ............................................................ 69 9.2 Bayswater Zone Substation rebuild .................................................................................................... 70 9.3 Belgrave Zone Substation REFCL installation................................................................................... 70 9.4 Benalla Zone Substation rebuild and REFCL installation ................................................................. 70 9.5 Clyde North Zone Substation Capacity Augmentation ...................................................................... 71 9.6 Doreen Zone Substation Capacity Augmentation ............................................................................. 71 9.7 Eltham Zone Substation REFCL installation ...................................................................................... 71 ISSUE 8.0 18/12/2020 3 / 133 UNCONTROLLED WHEN PRINTED AusNet Services Distribution Annual Planning Report 2021 - 2025 9.8 Ferntree Gully Zone Substation REFCL installation .......................................................................... 72 9.9 Kinglake Zone Substation REFCL installation ................................................................................... 72 9.10 Lang Lang Zone Substation REFCL Installation ............................................................................... 72 9.11 Lilydale Zone Substation REFCL installation ..................................................................................... 73 9.12 Maffra Zone Substation rebuild ........................................................................................................... 73 9.13 Moe Zone Substation REFCL installation .........................................................................................
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