Early reports were the fire covered a 200m front, but it would have eventually grown larger, he said.
"We've got a lot of resources there and we're putting out the remains of the vegetation fires.
"The wind is causing a lot of problems.''
All firefighters have donned breathing apparatus as there is thick, acrid smoke still hanging about the scene.
Two helicopters with monsoon buckets were called to the scene to help fight the blaze.
The fire crew from Clutha Valley were the first on the scene and were assisted by crews from Dunedin, Balclutha, Papatowai, Waiwera South, Gore, Waihola and Lawrence.