Horizon Power 132kV Transmission Line

Horizon Power 132kV Transmission Line
Karratha, WA
Horizon Power
Project dates
December 2019 - November 2020
Transmission & DistributionTesting & CommissioningDesign & Construction
Horizon Power 132kV Transmission Line


The future energy needs of the Pilbara are being met with the Western Australian State Government investing more than $23 million through Horizon Power to upgrade the 132kV Transmission Line between Karratha and Dampier. The Transmission Line is a critical piece of electrical infrastructure in the Pilbara which connects the Karratha terminal substation to the Dampier substation.

Disciplines Employed

  • Design
  • Construction
  • Testing & Commissioning

Scope of Works

  • Two hundred old wooden poles were removed and replaced with steel poles in a new configuration which means the number of poles will be reduced by 65%, improving town aesthetics with the removal of more than 200 poles.
  • The work consisted of replacing approximately 15 kilometres of aged equipment on the existing 19km Transmission Line.
  • A section of the line near the Karratha Airport Terminal was undergrounded.

The phases of the works were as follows:

  • Design and Procurement Stage
  • Dismantling Old Line
  • Clearing, Surveying and Setting-Out Stage
  • Bulk Earthworks Pad Construction
  • Foundation Construction Stage
  • Pole Erection Stage
  • Transmission Underground Cable Installation
  • Stringing and Cut-In Stage
  • Commissioning and Handover Stage


Commissioning on the 132kV Transmission Line took place in November 2020 bringing a successful end to the project.

The upgrade will reinforce the ageing infrastructure and ensure the security of supplies on the North West Interconnected System (NWIS) well into the future.

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Horizon Power