As many as 1500 households and businesses throughout the New South Wales' north-west will be left without power until at least Tuesday as a result of severe weather which hit the region at the weekend.

A severe storm which hit the north-west and the New England region, along with a large bushfire in the Warrumbungles, has destroyed at least 65 power poles, extensively disrupting the electricity transmission network throughout the area.

At the peak of the bad weather, power supplies were interrupted to about 25,000 customers of Essential Energy across Baradine, Coonabarabran, Gunnedah, Moree, Narrabri, Quirindi, Tamworth, Warialda and surrounding areas, a spokeswoman for the company said.

As of late Monday morning, about 4000 customers were still without power, she said.

It is anticipated that about 1500 customers will remain without power overnight while areas are cleared, vegetation is removed and repair work is carried out.

Additional crews have been deployed to the area to help restore supplies, with four helicopters also being used to assess the damage and help with the reconstruction efforts, she said.