Power was cut to many parts of Northland following a large scrub fire near Whangarei late yesterday.
The fire, which also originally threatened some homes, broke out under the main Northland power transmission lines at about 4.30pm near Holland Rd, Springfield, south of the Whangarei Harbour.
Transpower's corporate communications manager, Rebecca Wilson, said the state-owned power transmission company had switched off the 110,000 volt lines near the fire as a precautionary measure.
She estimated that around 30,000 households, businesses and other power "connections" in Northland were without mains electricity.
"The 110,000 volt network was removed from service due to the need to ensure the safety of those fighting the substantial scrub fire.