Project Progress
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OVERVIEW

Powerco is investing over $25 million to improve reliability and increase capacity of power supply for the South Waikato towns of Putaruru and Tirau, and the Hinuera area. We’re building a new connection to the national grid with a 110kV circuit from the Arapuni Power Station to supply a new transformer at the existing Powerco Putaruru substation.

The area is currently supplied by a single line between Transpower’s Karapiro and Hinuera substations. When the line experiences an outage or is out of service for maintenance there is complete loss of power to about 11,500 addresses. Once the new Powerco circuit and transformer are commissioned, this additional national grid connection will help ensure security of power supply for the region.

Link to our glossary 

The challenge

The Putaruru, Tirau and Matamata areas are supplied by a single Transpower line. When the line experiences a fault or is out for maintenance, there is loss of power to 11,500 customers in the area. 

The solution

Build a new circuit from Arapuni power station to the Powerco Putaruru substation, and upgrade the substation with a new building, transformer and new equipment. 

Once commissioned, if the existing Transpower line fails, supply will continue through the new Powerco circuit.  

The benefit

An additional national grid connection helping ensure the security of power supply for the area. 

Milestones

Commission new circuit

Finalise the detailed design for the circuit

Construct new substation buildings

The first part of the South Waikato Grid Connection project is to replace the building - which doesn’t meet earthquake resilience standards - and upgrade the equipment at the Putaruru substation.
2023
2021
2020-21

UPDATES

Find out the latest updates about this project

FAQ

We strive to minimise impact in the design and placement of network infrastructure and we’re still planning and consulting on the route for the new circuit. The circuit will be a mix of overhead lines – which you will see, and underground cable – which you won’t see. You’ll also see a new building at our Putaruru substation, replacing the ageing existing building there.

We can never guarantee supply 100% of the time, however, the number and length of outages you experience will be reduced.  

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Downloads

2020

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