Electricity Asset Management Plan 2019-2029
154
Vector Limited://
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
Forecast capacity constraint at Sabulite
Option 1: Upgrade the transformers to larger capacity units at Sabulite substation. Option 2: Hot-water load management may have been an alternative to defer Option 1, but it would need to be deployed very soon. The higher priority for Vector’s first large-scale roll-out is the Warkworth area, which will defer much greater expenditure. The age of the transformers also favours their replacement Option 1: Micro-grid at Piha. A battery-powered microgrid is being investigated as a solution to improve the resilience of supply to this remote community Option 2: Generation at Piha. An alternative to the battery microgrid is onsite diesel generation Option 3: Reinforce the 11kV network to Piha. While duplication of the 11kV supply to Piha is prohibitively expensive, extending the Scenic Road feeder will allow connection to the Piha feeder, providing a backstop. This solution also reduces the size of micro-grid solution proposed in Option 1
$3.6M Selected
Selected
Resilience improvement project
$4.4M Selected
Rejected
$1.3M Selected
FORECAST INVESTMENT SUMMARY
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
Upgrade the transformers at Sabulite zone substation
0.20
3.40
3.60
Piha microgrid
0.20
2.00
2.20
4.40
11kV feeder extension - Piha
1.30
1.30
Total CAPEX
1.50
2.00
2.20
0.00
0.00
0.20
3.40
0.00
0.00
0.00
9.30
NEEDS STATEMENT – CBD The Auckland CBD is undergoing a transformation driven largely by the redevelopment of existing commercial sites. Overlaid on this are significant infrastructure projects such as the City Rail Link (CRL), the Auckland Light Rail (LRT) and Streetscape improvement projects (e.g. Quay St). While these projects do not add significant load to the Auckland CBD, they nonetheless consume considerable resource protecting or moving existing network without compromising security of supply.
The America’s Cup is scheduled to be held in March 2021 while APEC is programmed for November 2021. Again, these events will not contribute significantly to CBD demand, but supply security is vital during these international events.
The projects in the CBD are focussed mainly around the three key substations, namely Liverpool, Hobson and Quay St. Switchboard replacement projects (see later in section 5) have been identified for both Hobson and Quay St and these need to be coordinated with a number of growth related projects. At Liverpool substation we are extending the 110kV switchboard (Liverpool - 110kV switchboard extension including bus-zone protection upgrade) to remove operational
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