Bunnythorpe-Wilton (Judgeford to Wilton) Reconductoring Investigation

Region Map
Judgeford to Wilton Section
64
Towers
Line length
28
km
Conductor replacement by
2021
or alternate investment

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 identified that the Judgeford to Wilton section of the Bunnythorpe-Wilton transmission line in Wellington will require its conductor (ie wire) replaced in the near future.  This line section helps provide supply to the Wellington region, and the entire line is also a key enabler for moving power south or north on the HVDC inter-island link.

A need to investigate

Before we replace the conductor on this line we need to make sure that from an economic perspective, it is the best option to undertake.  There may be other options including new generation, demand response, smaller or larger capacity conductor, or a new substation that alone or in combination with each other could avoid or defer our need to replace this conductor.

Why we're doing it

The Judgeford to Wilton section of this transmission line experiences heavy salt corrosion and high winds due to being close to the exposed Wellington southern and western coasts.  Deterioration of the conductor has reached a point where replacement in the near future is required in order to continue to provide a safe high voltage transmission service.

We have released our need/long listing document (see below) and are seeking submissions by 19 October 2016.