Almost 30,000 without power in SA

Almost 30,000 properties are without power in South Australia after an outage at a substation.

An outrage at Fullham Gardens substation on Thursday evening is affecting about 15,000 customers, SA Power Networks says, while another 13,000 are experiencing outages likely related to the extreme heat.

Adelaide recorded Australia's hottest ever capital city temperature - a sweltering 46.6C - earlier on Thursday.