Top Energy chief executive Russell Shaw said it was "extremely unfortunate" that Kaitaia's power would have to be turned off again, just six weeks after the February 1 shutdown.
"We hope the people of Kaitaia understand just how important this is," he said.
Mr Shaw said it appeared the wires were the only thing now holding the pylon up.
To stop it collapsing when the wires were removed the pylon had been tethered to a series of five-tonne concrete weights. Gauges on the strops would provide warning of any changes in tension. The weights had been flown in by helicopter, one tonne at a time.
The company had already built a replacement tower, a 17m-high double-pole structure, to carry the high-voltage lines. It had also reinforced the towers on either side of the damaged pylon.
Replacement wires have already been strung to the new tower with only the switch over and removal of the old wires to be done on Sunday.
The power had to be off to do that.
The trickiest part of the operation would be releasing the wires from the damaged pylon, Mr Shaw said.
It would have to be done without putting any extra strain on the pylon.
If bad weather hit, the work would be postponed to March 22.
The forecast so far was promising.
- The power will go out from 8am-5pm on March 15 in Kaitaia, the Aupouri Peninsula and much of North Hokianga.
