Electricity Asset Management Plan 2019-2029
205
Vector Limited://
Auckland Transport’s street lights on and off. This system has a minimum 15-year projected life before a new technology solution would be completely rolled out across the network.
All PC85 controllers require replacement, with the first completed in FY18. They are at the end of their life, are an unsupported product, with no spares available from the supplier. Units have been failing over the last three years, only three of the original 12 units are fully functioning and further failures will result in permanent loss of load control. Replacement will also allow decommissioning of the similarly end of life and unsupported Nokia-based communication system.
TARGETED OUTCOMES
CUSTOMER EXPERIENCE
SAFETY
RELIABILITY
RESILIENCE
OPERATIONAL EFFICIENCY
CYBER SECURITY AND PRIVACY
OPTIONS CONSIDERED Options to address the need identified above have been assessed and are summarised in the following table.
DESCRIPTION
DISCUSSION OF OPTION
ESTIMATED COST (NPV IF APPLICABLE)
STATUS
Option 1: Do nothing
Reliance on the existing controllers hold unacceptable risks to performance for the Auckland network customers and Auckland Transport for whom we still control a sizeable portion of streetlights. Non-control of street lighting is a risk to Public safety and reputation for Auckland Transport and Vector. Loss of ability to offer controllable load into the Energy Market risks loss of reputation and revenue. Selecting a ‘Do-nothing’ approach could result in no recovery options during unpredictable failures. This programme will remove the risk of single mode failure of the load control system in the Auckland network. It will reduce the risks associated with the ‘Do-nothing’ approach
Rejected
Option 2: Replace the PC85 controllers with a modern equivalent configured for the Auckland ripple control systems in the Auckland zone substations
$0.39M Selected
PROPOSED INVESTMENT SUMMARY ($MILLION NOMINAL)
DESCRIPTION
FY20
FY21
FY22
FY23
FY24
FY25
FY26
FY27
FY28
FY29 TOTAL
Ripple Plant PC85 controller replacement
0.39
0.39
Total CAPEX
0.39
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.39
PENROSE - HOBSON TUNNEL SYSTEMS UPGRADE PROGRAMME
NEEDS STATEMENT The Penrose to Hobson Tunnel contains Vector’s 110 kV, 33 kV and 22 kV subtransmission cables from Transpower GXPs and between Vector’s CBD bulk supply zone substations. The tunnel also contains Transpower’s 220 kV North Auckland and Northern cable from Penrose GXP to Vector’s Hobson Street zone substation. Transpower has shared access rights for the tunnel. The tunnel was commissioned in 2001 and the auxiliary systems necessary for personnel safety and performance of the power cables are now progressively starting to fail having reached end of life. To also ensure maintenance and emergency access these systems cannot be run to failure. This includes the service train within the tunnel, that is subject to New
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