Asset Management Plan 1st April 2021 – 31st March 2031 Prepared by Buller Electricity Ltd www.bullerelectricity.co.nz March 2021 To Ensure Public Safety and Prudent Financial Management and control. Buller Electricity Asset Management Plan 1st April 2021 – 31st March 2031 1 SUMMARY ........................................................................................... 1-1 2 BACKGROUND & OBJECTIVES ........................................................ 2-1 3 SERVICE LEVELS ............................................................................... 3-1 4 ASSETS COVERED ............................................................................. 4-1 5 ASSET MANAGEMENT & LIFECYCLE .............................................. 5-1 6 NETWORK DEVELOPMENT ............................................................... 6-1 7 MANAGING BUSINESS RISKS ........................................................... 7-1 8 PLAN IMPROVEMENTS & MONITORING .......................................... 8-1 9 APPENDIX A GLOSSARY OF TERMS ............................................... 9-1 10 APPENDIX B MANDATORY EXPLANATORY NOTES .................. 10-1 i Buller Electricity Asset Management Plan 1st April 2021 – 31st March 2031 List of Figures Figure 1– BEL Supply Region ........................................................................................................................ 1-5 Figure 2 BELs Vision, Mission and Values ..................................................................................................... 2-4 Figure 3 Strategic Plan RoadMap .................................................................................................................. 2-5 Figure 4 Strategic Plan Focus Areas .............................................................................................................. 2-5 Figure 5 - Interaction of plans and processes ................................................................................................ 2-6 Figure 6 - BEL Organisation Structure ......................................................................................................... 2-17 Figure 7 - Development of AMP ................................................................................................................... 2-20 Figure 8 – Assessment process for future load growth ................................................................................ 2-22 Figure 9 – Performance monitoring process ................................................................................................ 2-23 Figure 10 Fulcrum Tree Status Mapping ...................................................................................................... 2-25 Figure 11 Fulcrum Tree Data Capture Record ............................................................................................. 2-26 Figure 12 Fulcrum Tree Work Details ........................................................................................................... 2-27 Figure 13 BEL information Systems Architecture ......................................................................................... 2-30 Figure 14 - Overview of service levels ............................................................................................................ 3-2 Figure 15 Acceptability of the Number and Length of Power Cuts ................................................................ 3-5 Figure 16 Customer Information Interest ........................................................................................................ 3-6 Figure 17 Customer Price/Quality Trade-offs ................................................................................................. 3-6 Figure 18 BEL Supply Region ........................................................................................................................ 4-2 Figure 19 Electricity Networks in the BEL Region .......................................................................................... 4-4 Figure 20 BEL 33kV Subtransmission Network ............................................................................................. 4-5 Figure 21 Distribution Feeders Supplied from Robertson Street Substation ................................................. 4-6 Figure 22 Distribution Feeders Supplied from Ngakawau Substation ............................................................ 4-7 Figure 23 Distribution Feeders Supplied from Kongahu Substation .............................................................. 4-9 Figure 24 Robertson Street Single Line Diagram ......................................................................................... 4-11 Figure 25 Robertson Street Maximum Demand ........................................................................................... 4-12 Figure 26 Ngakawau Substation Single Line Diagram ................................................................................. 4-13 ii Buller Electricity Asset Management Plan 1st April 2021 – 31st March 2031 Figure 27 Ngakawau Substation 11kV Maximum Demand .......................................................................... 4-14 Figure 28 Kongahu Substation Single Line Diagram ................................................................................... 4-16 Figure 29 Kongahu Substation Maximum Demand ...................................................................................... 4-17 Figure 30 Age Profile Concrete Poles .......................................................................................................... 4-18 Figure 31 Age Profile Pre-Stressed Concrete Poles .................................................................................... 4-18 Figure 32 Age Profile Softwood Poles .......................................................................................................... 4-19 Figure 33 Age Profile Hardwood Poles ........................................................................................................ 4-19 Figure 34 Age Profile 33kV Crossarms ........................................................................................................ 4-20 Figure 35 Age Profile 11kV Crossarms ........................................................................................................ 4-21 Figure 36 Age Profile LV Crossarms ............................................................................................................ 4-21 Figure 37 Age Profile 33kV Conductor ......................................................................................................... 4-22 Figure 38 Age Profiles 11kV Conductor ....................................................................................................... 4-23 Figure 39 Age Profile 230V Conductor ......................................................................................................... 4-23 Figure 40 Age Profile CB's, Reclosers and Sectionalisers ........................................................................... 4-24 Figure 41 Age profile for Air Break Switches ................................................................................................ 4-26 Figure 42 Age Profile for Fuses and Links ................................................................................................... 4-27 Figure 43 Optimal Maintenance Scheduling................................................................................................... 5-2 Figure 44 Health and Wellness Charter ....................................................................................................... 7-15 Figure 45 – SAIDI performance ...................................................................................................................... 8-2 Figure 46 – SAIFI performance ...................................................................................................................... 8-3 Figure 47 - 33 kV Network Faults per 100km ................................................................................................. 8-3 Figure 48 - 11kV Network Faults per 100km .................................................................................................. 8-4 Figure 49 Outage minutes caused by tree contact ......................................................................................... 8-5 Figure 49 - Energy Loss Ratio ........................................................................................................................ 8-9 Figure 50 - Financial Cost per Km for YE 2020 ............................................................................................ 8-10 Figure 51 Financial Cost per ICP for YE 2020 ............................................................................................. 8-10 Figure 52 – 10 Year Financial Forecast Comparison ................................................................................... 8-11 Figure 53 BEL Plan Improvement Workstreams .......................................................................................... 8-12 iii Buller Electricity Asset Management Plan 1st April 2021 – 31st March 2031 Figure 54 Updated asset condition records .................................................................................................. 8-12 Figure 55 GIS/AMD update schedule ........................................................................................................... 8-14 Figure 57 - Westport Flood Scenario ...........................................................................................................