Electricity Asset Management Plan 2019-2029
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Vector Limited://
Option 5: A 6km undersea cable from the Tapora peninsula to South Head is an alternative to Option 3. This has the potential to reduce SAIDI on the W39PORT and W13SOUT feeders from 45 SAIDI minutes since 2001 to a figure less than 24 SAIDI minutes Option 1: Install a second transformer at Spur Rd substation: Forecast load increases to the west of Silverdale along Dairy Flat Highway and Pine Valley Rd. has initiated this reinforcement project. The existing substation is nearing network security limits and the second transformer will restore increase the capacity headroom. A new switchroom will also be installed. This substation will backup Kaukapakapa zone substation once constructed Option 2: East Coast Road 11kV reinforcement. Two feeders out of Spur Road substation are constrained by small conductor size – the lines will be upgraded Option 3: DSM solutions. A trial of Telensa hot water control technology was made in this area. While the trial was successful the requirement for reinforcement remains Makarau SAIDI Improvement: Connecting Kaukapakapa and Kaipara feeders offers a reduction of nearly 4 SAIDI- min per annum. Kaipara Flats SAIDI Improvement: Connecting Limeworks and Kaipara feeders may save up to 2 SAIDI-min per annum Wainui SAIDI Improvement: Connecting Orewa and Waiwera feeders may save up to 0.27 SAIDI-min per annum
Under analysis
Support growth west of Silverdale
$7.8M Selected
$1.5M Selected
Trialled
SAIDI Improvement Initiatives
$1.3M Selected
$0.8M Selected
$0.2M Selected
FORECAST INVESTMENT SUMMARY DESCRIPTION FY2 0 FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29
TOTA L
Upgrade 11kV switchboard at Orewa zone substation
3.10
3.10
Establish Millwater zone substation
0.50
3.89
3.89
8.28
11kV feeder reinforcement – Hibiscus Coast Establish Kaukapakapa zone substation Upgrade transformers at Helensville zone substation Install a second transformer at Spur Rd zone substation 11kV feeder extension – East Coast Rd
2.00
2.00
0.50
3.40
3.40
7.30
0.20
1.50
1.70
4.74
2.50
7.24
1.50
1.50
11kV feeder extension – Makarau/Kaukapakapa
1.30
1.30
11kV feeder extension – Kaipara Flats
0.80
0.80
11kV feeder extension - Wainui
0.20
0.20
Total CAPEX
7.84
4.80
1.50
0.00
0.00
0.20
2.00
4.39
7.29
5.40
33.42
NEEDS STATEMENT - ALBANY As with Silverdale, growth investment is being driven by the conversion of rural areas into more intensive residential urban areas. A second transformer is planned for Waimauku substation (Waimauku - second 33/11kV transformer) while an upgrade of the subtransmission is planned in conjunction with NZTA’s Safer Roads programme along SH16 (Waimauku - future-proofing ducts (SH16 - Waimauku)). This project allows the installation of cable ducts for future subtransmission network upgrades as the Waimauku load increases exceeds Security of Supply thresholds.
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