Electricity Asset Management Plan 2019-2029
159
Vector Limited://
FORECAST INVESTMENT SUMMARY
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
11kV feeder reinforcement - Flatbush 11kV feeder reinforcement – East Tamaki
0.49
1.49
1.98
0.75
0.75
Future-proofing ducts - Flatbush
0.80
0.80
Total CAPEX
2.04
0.00
0.00
1.49
0.00
0.00
0.00
0.00
0.00
0.00
3.53
NEEDS STATEMENT – MANGERE Mangere covers the Mangere township and surrounding residential areas, extending south to the developing commercial areas out by the airport. Watercare have forecast significant demand growth associated with their treatment plant and when coupled with the greenfields commercial growth in the Ihumatao area, capacity constraints are forecast for the Mangere West substation. Eventually a new zone substation (Mangere South - new zone substation) will be required in the Ihumatao area but to forestall this investment a third transformer is being installed in Mangere Central substation (Mangere Central - third 33/11kV transformer) to enable load transfer from Mangere West. Distribution feeder reinforcement is required on the Ascot Rd, Mangere Bridge and Oruarangi Rd feeders out of Mangere Central substation and Robertson Rd feeder out of Mangere East substation to enable the load transfer and accommodate the new load
TARGETED OUTCOMES
CUSTOMER EXPERIENCE
SAFETY
RELIABILITY
RESILIENCE
OPERATIONAL EFFICIENCY
CYBER SECURITY AND PRIVACY
OPTIONS ASSESSMENT For major projects, i.e. above $4M (level to be confirmed), include the following in this section: Technical feasibility, economic analysis, OPEX and CAPEX costs, net present value or net present cost, service levels, risks, etc.
DESCRIPTION
DISCUSSION OF OPTION
ESTIMATED COST (NPV IF APPLICABLE)
STATUS
Capacity shortfall in the Mangere area
Option 1: Install a third transformer in Mangere Central substation. Growth in the Ihumatoa area by the airport is forecast to cause constraints on the Mangere West substation. To defer the upgrade of this substation or construction of a new substation this project proposes the installation of a third transformer at Mangere Central substation. This substation was previously a three- transformer substation so previously install but subtransmission cables will be reinstated Option 2: Upgrade Mangere West substation. This substation is located on private Watercare land with current upgrades to the wastewater network, significant demand increases are forecast for this substation. Expanding this substation for further commercial usage is not the best long term option Option 3: Construct a new substation in south Mangere. The rapidly expanding commercial area surrounding the airport will require a new substation to meet the forecast capacity. The timing of this will be determined by when the additional supply security gained by the reinforcement proposed under Option 1 is again compromised by the growth. In the interim we will secure land for the future substation
$1.16M Selected
$5.3M Rejected
$16.9M Under analysis
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