Lower South Island Grid Reliability Work

Region Map
Approved cost
from 2013

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.


What we're doing

This project provides more capacity to our networks in the lower South Island.  It involves:

  • a new transformer at Invercargill
  • a replacement transformer at Roxburgh
  • a new section of 220 kV transmission line between Gore and the North Makarewa–Three Mile Hill line
  • new 220 kV transformers at Gore.

Why we're doing it

This project will help reinforce the regional network in the Southland area which is expecting increased growth through dairying and mining. The project will also help reinforce the network into Southland during dry periods when low water inflows restrict generation from the Manapouri hydroelectric generation station.

How it will affect you

We do not expect the local power supply to be affected during this project and construction impacts are likely to be localised to in and around our substation at Gore. We will do our best to keep any disruptions to a minimum and to keep you well informed of what we're up to.

How it will impact your electricity bill

We expect the cost of the project on all New Zealand consumers to be up to about 83 cents a year (or about 7 cents a month) for an average consumer.  Over the longer term this cost will reduce. 

More information about the project

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