Temporary transmission towers will be constructed to restore high voltage powerlines that were blown over in Friday's storm near Cressy, but work could take two weeks.
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AusNet Services said it was hoping to have one of the two powerlines restored within a week.
The storm knocked over six towers on the two transmission lines and damaged other towers, the impact causing Portland's Aluminium smelter to lose power for the second time in three months.
The smelter has warned it was at significant danger of further unreliable supplies and operational impacts until the second transmission line was operational.
An AusNet Services spokesperson said preliminary design work for the temporary resconstruction of the transmission towers had been completed and materials would start arriving on site on Monday.
"We're moving ahead with urgency due to the importance of the reconnection of the Portland Aluminium Smelter to the 500kV lines," she said.
Portland's aluminium smelter faces "substantial challenges" to ensure its safe and ongoing operations after a storm tore down high-voltage powerlines near Cressy and left the business without power for about three hours on Friday.
It is the second externally-caused outage to significantly impact the smelter in less than three months following a similar outage in November.
The smelter was receiving power from only one of its two incoming 500kV transmission lines, leaving it exposed should there be further supply issues.
Witnesses reported the sky turning black and square hay bales flying down the road when Friday's storm hit.
An AEMO spokesman said the 220kV and 66kV powerlines that supply power to homes and businesses were still operating.
The spokesman said the import and export of energy between Victoria and South Australia was unavailable until the transmission line was returned to service.
"There's no forecast supply reserve issues for the state of Victoria for the next seven days due to milder weather but we're continuing to monitor that situation and the impact that the damaged transmission line may have," the spokesperson said.
Polwarth MP Richard Riordan said he would raise concerns in Parliament this week about why the towers fell over.
"I'll be calling for a full review of the state of the transmission line," Mr Riordan said.
"Up to cyclonic winds infrastructure like that should be built for," he said.
"Had this break happened the other side of the Mortlake Power Station, bye bye aluminium smelter"
Mr Riordan said the high voltage transmission line was vital if the state was to meet its renewable energy target, with a number of windfarms tapping into it.
"We're very lucky it didn't set off a catastrophic fire across Western Victoria," he said.
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