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14/09/2018
Zinfra finishes up Horizon Power transmission line project in WA

Zinfra's transmission line construction project for Horizon Power in Western Australia came to a close when the new transmission line was successfully energised last week.

Zinfra Resource Manager, Dallas Auld, reported:

"In June 2015 Zinfra Southern Contracting was awarded the Horizon Power X2 and X1, 220kV line construction project.

The work was located near Port Hedland in WA and was undertaken under the direction of GHD Perth. The project consisted of 6.3 kilometres of overhead transmission line (towers and mono poles), 800 metres of underground 220kV cable, three cable termination poles, associated civil work and related infrastructure components. Zinfra engaged a number of subcontractors to assist with the project as the time frame was extremely short, and penalties high for any over run. Part of the scope required Zinfra to erect scaffolding for a cable subcontractor which ended up being seven stories high, fully enclosed and air conditioned!

The project came with the usual suspects: extreme weather, reliance on material deliveries, breakdowns, the tricky nature of mobilising and managing a large scale project at a remote site. A small bush fire and high winds delayed things for a while, but the crews were soon back to it and stringing works began in early October.

After the challenges of coordinating scaffold workers, cable jointers, cable testers, commissioning crew and lines staff, the X2 transmission line was energised on 23 November. This was four days after the planned energisation date, but due to the bush fire and associated delays this was an incredible effort from all involved. The last piece of the jigsaw puzzle was the final spans of the X1 220kv line, where we were required to realign the last three spans of the circuit and dismantle an old tower at the Hedland terminal. The team fully demobilised on 18 December after X1 was energised on 17 December."