Central North Island 220 kV Capacity Investigation

Region Map
Bunnythorpe to Whakamaru
220 kV circuits
in economic benefit in next 15 years
Project delivery

What we're doing

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.

There are three areas of potential constraint in Transpower's North Island network with respect to the amount of generation required to be connected/transported around the island due to New Zealand's progress to a zero-carbon economy.  This project is about investigating the capacity of the 220 kV grid between Bunnythorpe and Whakamaru.  Similar projects are underway with respect to the capacity of the HVDC and further investment in the Wairakei Ring (subsequent to the Atiamuri series reactor project underway).

Why we're doing it

As part of our Net Zero Grid Pathways work, we have identified that with the expected eventual closure of Tiwai Aluminium smelter and expected new generation in the North Island there is significant economic benefit to New Zealand in relieving potential constraints in our core network in addition to the Clutha Upper Waitaki Lines Project which is presently underway. More information on the Net Zero Grid Pathways Project can be found here.

More Information

Because of the relationships between this project, the capacity of the HVDC and the capacity of the Wairakei Ring, we are undertaking the investigations concurrently.  A long listing document has been releasedSubmissions are due by 1 October 2021.