Electricity Asset Management Plan 2019-2029
149
Vector Limited://
Improve network security at the southern end of the Dairy Flats development area
Option 1: Install a second transformer at Coatesville. This project is to add capacity to Coatesville to supply the new residential load to the north-west of Coatesville, and address a shortfall in backstop capacity. A transformer will be relocated from a substation upgrade project Option 2: DSM options. The backstop shortfall is increasing at 750kVA/annum. Hot water load control will provide less than 2 years of deferral NZTA Northern Corridor Improvement- duct installation: The establishment of a new NZTA interchange at Constellation Dr/SH1 intersection will close off the opportunity to access our Albany – Wairau Rd transmission corridor. Installing ducts during the civil construction phase will provide a degree of future-proofing
$1.25M Selected
$0.5M Rejected
Northern Corridor Improvements
$0.12M Selected
FORECAST INVESTMENT SUMMARY
DESCRIPTION
FY2 0
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29
TOTA L
Upgrade transformers at Waimauku zone substation Install ducts under SH16 – Waimauku - Huapai
0.20
1.60
1.80
1.40
1.40
1.40
4.20
11kV feeder upgrade – Muriwai
0.80
0.80
Install a second transformer at Coatesville zone substation
0.20
1.05
1.25
SH1/Constellation Dr - ducts
0.12
0.12
Total CAPEX
1.52
2.20
1.40
0.00
0.40
2.65
0.00
0.00
0.00
0.00
8.17
NEEDS STATEMENT – WAIRAU RD Modest growth in the Wairau Valley area is driving brown-fields investment. Highbury is a single transformer substation in the middle of two adjacent single transformer substations, Northcote and Balmain. Housing New Zealand redevelopment in Northcote coupled with the reliance on the supply from adjacent substations is contributing to the need for this project. A second transformer and subtransmission circuit upgrade is planned for Highbury (Highbury - second 33/11kV transformer and new subtransmission cable) to improve local network security as well as that to Northcote and Balmain substations. Takapuna substation is a single transformer zone substation, supplying the important and growing Takapuna commercial area. It also serves as a backup to adjacent Hauraki substation and is critical for the supply to Belmont and Ngataringa Bay in the event the Belmont subtransmission circuits are out of service. A second transformer and subtransmission upgrade is proposed for Takapuna substation (Takapuna - second 33/11kV transformer and new subtransmission cable).
A separate project has been included to address a flooding risk at low-lying Ngataringa Bay substation (Ngataringa Bay Zone Substation flood mitigation). This risk is expected to increase under forecast climate change scenarios.
An 11kV feeder upgrade is proposed at Hillcrest substation.
TARGETED OUTCOMES
CUSTOMER EXPERIENCE
SAFETY
RELIABILITY
RESILIENCE
OPERATIONAL EFFICIENCY
CYBER SECURITY AND PRIVACY
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