Electricity Asset Management Plan 2019-2029
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Figure 5-1 Geographic areas as basis of Needs statements
NEEDS STATEMENT - WELLSFORD Increasingly, whether for reasons of lifestyle or affordability, customers are choosing to live further from Auckland’s city centre. Demand growth is forecast in the Warkworth, Snells Beach, Matakana, and Omaha areas, and is expected to accelerate with the completion of the SH1 motorway extension to Warkworth. Travel times to Auckland CBD will be significantly shortened, increasing the attractiveness of this locality as a place to live. The increasing demand will threaten network security at Warkworth, Snells Beach and Omaha. Two new zone substations are planned at Omaha (Omaha - new zone substation) and Warkworth (Warkworth South - new zone substation) respectively, allowing load to be redistributed across Snells Beach and Warkworth substations. Supply to Warkworth/Snells Beach/Omaha area comes from Transpower Wellsford GXP, some 19km to the north. The two subtransmission lines between Wellsford and Warkworth are nearing capacity. Steps have been taken to reduce the loading on these circuits, delaying the need for costly reinforcement. These include the installation of network batteries at Snells Beach and Warkworth to flatten the demand profile while a third project is planned to upgrade the load control to enable load shifting (Warkworth - implement load control). Ultimately a more substantial upgrade may be required comprising an additional subtransmission circuits between Warkworth and Wellsford. At this time, the 33kV subtransmission switchyard will need to be upgraded at Wellsford zone substation (Wellsford - 33kV switchboard upgrade). NZTA are undertaking a Safer Roads programme on SH1 between Wellsford and Warkworth to improve traffic safety. We have an opportunity to install ducts (Warkworth - future-proofing ducts (Wellsford - Warkworth (NZTA), Wellsford GXP -Wellsford 33kV upgrade) along this section of road in anticipation the need for future subtransmission reinforcement. The installation of cables in the ducts can be delayed until needed in the future (Warkworth - new 33kV cable (Wellsford-Warkworth)).
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