North Taranaki Regional Supply Project

Region Map
Electricity consumers
in Northern Taranaki
Number of options being considered
to keep Northern Taranaki secure

We need to continually operate, maintain and develop New Zealand's transmission network - the National Grid - to ensure we meet the ongoing electricity needs of New Zealanders.

We have several projects planned or underway in the Taranaki region to improve supply there.  These include:

  • decommissioning and removing our equipment from the existing New Plymouth substation (at Port Taranaki);
  • constructing new 33 kV indoor switchgear at Carrington Street substation, enabling the connection of new 33 kV underground cables (owned by Powerco and connecting to their Moturoa zone substation);
  • installing a new 220 kV/110 kV interconnecting transformer at Stratford substation and converting the existing 220 kV New Plymouth to Stratford transmission line to 110 kV operation; and
  • replacing conductor on our Carrington Street to New Plymouth transmission line.  This work will also consider:
    • the extent to which some spans of the transmission lines near the Port may be economic to remove, given that New Plymouth will no longer be required as a Transpower site, and 
    • the potential for future development and associated supply requirements in the Port area precinct.  



Why we're doing it

The New Plymouth substation connects the Taranaki regional 110 kV network to the national grid via one 220/110 kV interconnecting transformer which provides approximately half of the supply to the Taranaki area.  We are vacating this site as it is now required by Port Taranaki for its own purposes, and we have (together with Powerco) determined a suitable option (underground cabling from our Carrington Street substation to Powerco’s Moturoa zone substation) to ensure supply is not at risk for consumers.   The determination of an investment path follows consultation we had with key stakeholders in 2015.  We expect the work to be complete by around 2020. 

More information about the project

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