Fire fighters have contained a fire at Port Lincoln on South Australia's lower Eyre Peninsula after the loss of nine houses and a state emergency service base.
Power has been restored to more than 2000 homes but more than 4000 are still without electricity.
The threat posed by a bushfire near Kingston in South Australia's southeast has also been reduced.
The Country Fire Service said 150 firefighters and 30 fire trucks were working to contain the blaze, which burnt out about 500 hectares on the outskirts of Port Lincoln.
Another bushfire at Kingston in the southeast of the state had burned out 1500 hectares by Wednesday.
Catastrophic fire danger ratings have been issued for eight of the 15 fire districts in South Australia in the country's worst day of fire risk since the Black Saturday bushfires in Victoria on 7 February.
The ABC reports the districts at risk stretch from the West Australian border to Victoria.
Severe or extreme fire danger ratings apply in seven other districts, with temperatures of up to 40Â°C and strong winds around much of the state.
The eight catastrophic districts are: mid-north, Flinders, Yorke Peninsula, upper south-east, Lower Eyre Peninsula, Eastern Eyre Peninsula, Murraylands, West Coast.
There is an extreme fire danger in Riverland, north-west Pastoral, Mount Lofty Ranges, Kangaroo Island, and the lower south-east.