Project Progress
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OVERVIEW

Powerco is investing over $33 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 Transpower’s Arapuni substation 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 Transpower’s Arapuni substation 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

Begin construction of circuit

Finalise the detailed design for the circuit

Confirm route 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
2021
2021
2020-21

UPDATES

Find out the latest updates about this project

FAQ

We are still in the planning phase, so we can’t be
definitive. At this stage, we know we will need traffic
management while we install overhead poles and line
along the road reserve.

We do not yet have a detailed design of the overhead
lines, but at this stage we believe the poles will be
18-20 metres high with spans of approximately 50-200
metres between each pole.  
 
This is an example of what the overhead line may look like.

We are using a mix of underground cable and
overhead lines due to considerations including cost
and terrain.

Detailed designs will be ready mid-2021.

At this stage we plan to start construction by the end
of 2021 and be complete by mid-2023.

We can never guarantee 100% supply, however
this circuit will help ensure security of supply for the
region.

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Downloads

2020

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