Transpower confirmed it had completed work on a temporary tower — boosting supply — but warning full power security for Northland would "hopefully" be restored to the region before Friday.
A pylon fell near Glorit on Thursday during routine maintenance, causing outages across the region that impacted tens of thousands of residents and businesses.
Both Transpower and the Electricity Authority were conducting investigations into the incident.
Transpower's general manager of grid delivery Mark Ryall said design engineers and service providers worked at "incredible speed" to complete work ahead of Monday morning when demand would ramp up.
"With electricity supply into Northland at reduced levels, it was critical we got this tower up and supply restored through our 220 kV network over the weekend," he said.
The tower now carried one of the region's two 220kV transmission lines.
Work was completed and the circuit re-livened shortly after 2pm on Sunday.
However, full security of the power supply would not be restored until the second 220kV circuit was restored, Ryall said.
“We will be doing everything we can to get this completed as quickly as possible and hopefully before Friday."
Additional temporary structures would need to be installed and the remaining circuit transferred across. This circuit was under the fallen pylon and more complex than the first circuit to fix.
"This means there is increased risk of short power cuts if faults happen to one of our three circuits currently supplying Northland but, depending on the cause, any disruption is likely to be short lived," Ryall said.
Transpower chief executive Alison Andrew said the disruption to supply was "unacceptable".
"We apologise to all those that have been impacted by the outage caused by the fallen tower.
"It is never easy to be without electricity and we know that Northland has been through a lot in recent years."
She also acknowledged it was a "resilient part" of the country, thanking local communities and leaders, Civil Defence and lines companies for support and assistance.
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