A man was charged with the cultivation of cannabis and appeared in Tauranga District Court this morning.
"An inquiry is under way to established any criminal liability in relation to the fire and identify anyone else who might be associated with the cannabis operation," Mr Turner said.
Anyone who knew of people illegally re-routing electricity should alert police, he said.
A fire communications spokeswoman said two fire units responded to the fire yesterday evening.
It was a small fire when they arrived and firefighters quickly extinguished it and dampened down hot spots.