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Twelve families have lost embryos at an Adelaide fertility clinic hit by statewide power outages.
Flinders Fertility lost power and its back-up generators failed during the statewide blackout on Wednesday, compromising incubators.
"Despite every effort by our scientists, the embryos are no longer viable," chief executive Stefan Moro said in a statement on Friday.
"This is a devastating situation for our patients, and very distressing for our staff.
"Flinders Fertility doctors have contacted patients directly and individual support and counselling is being provided."
Mr Moro said families wishing to repeat the procedure through another cycle would be given priority and would not face additional charges.
He said cryopreserved material was not affected by the blackout and a report was being prepared into the system failure.
AAP