115 WEL Networks | 2018 Asset Management Plan wel.co.nz NETWORK DEVELOPMENT Consumer Connection Schedule Customer Connection ($000 in Nominal Price) 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 Residential Customers 12,237 10,733 10,155 9,086 9,298 9,507 9,721 9,940 10,163 10,392 Business Customers 752 663 643 587 594 607 621 635 649 664 Large Customers-Low Voltage 400V 1,472 1,098 1,122 1,148 1,174 1,200 1,227 1,255 1,283 1,312 TOTAL 14,462 12,494 11,920 10,822 11,065 11,314 11,569 11,829 12,095 12,367 Table 6.2.2 Consumer Connection projected capital expenditure 6.3 SYSTEM GROWTH We expect system peak demand to modestly increase over the AMP period. Table 6.3.1 shows the individual GXP capacity, forecast, and the demand forecast for the AMP period. GXP Installed capacity Firm Capacity 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 Hamilton 11kV 80 44 29 30 30 31 31 31 31 31 31 31 Hamilton 33kV 220 132 135 138 139 139 140 140 140 140 140 141 Huntly 33kV 120 82 26 27 28 28 28 28 28 28 29 29 Te Kowhai 33kV 230 136 103 106 108 110 112 113 114 114 114 115 System Peak 273 281 285 288 290 292 293 293 294 294 ƒ ƒ Our system peak demand forecast shows a need to augment the supply capacity at the Hamilton GXP. To address the capacity issue at the Hamilton 33kV GXP the following measures have been undertaken or will be investigated and implemented: ƒ ƒ Improved load management. Investigations indicate that reductions in the peak demand can be achieved by improving the reinstatement of our load control; ƒ ƒ One of the two transformers at Hamilton (T5) is smaller than the other and due to be upgraded. Transpower’s life cycle replacement of T5 will add additional firm capacity of 9MVA. ƒ ƒ The system growth is described in the network which the GXP supplies. This is outlined further in the following sections. 6.3.1 HAMILTON NETWORK DEVELOPMENT PLAN Hamilton network is supplied by Hamilton 33kV and Hamilton 11kV. However, they are separated by a phase shift of 30° or 90° depending on the adjacent Hamilton 33kV zone substations and the Hamilton 11kV. This means that we cannot easily and automatically connect Hamilton 11kV network to the Hamilton 33kV network. This network supplies the council’s structured plan in Rototuna, Ruakura and Peacockes as well as CBD developments. There are a number of residential subdivision developments in the Rototuna, Borman area and in the northern part of the Ruakura structured plan. Table 6.3.1 GXP demand forecast to 2028