Network maintenance is a key part of keeping electricity flowing to the homes and businesses of North Canterbury. MainPower carries out network maintenance and upgrades year round. Below is a summary of some of our larger projects. For more information, please refer to our current Asset Management Plan.

Southbrook 66kV Substation upgrade

Overview: Rangiora and the surrounding area is experiencing significant growth, with new subdivisions and businesses springing up at a steady rate. The Southbrook Substation supplies this region. It currently operates at 33kV. The purpose of this project is to upgrade and replace the substation to a higher capacity 66kV/11kV 40MVA substation.

This project will future proof the network and allow us to continue providing a reliable supply of electricity to customers on our growing network.


  • design of the zone substation completed
  • system equipment procured
  • geotechnical works
  • compound and earthing works
  • other civil works

June 2021 update: Concrete poured for new switchroom foundations. Civil works continue to progress to schedule.

July 2021 update: The transformer foundations have been poured and switchroom construction is underway. Once complete, the switchroom will house 11kV switchboards and protection, as well as control and communications equipment.

September 2021 update: The two new transformers for the substation delivered and lifted onto their foundations.

MainPower NZ Ltd

New transformer being lifted onto foundations at Southbrook Substation in September 2021.