Latest update
https://www.aemo.com.au/Media-Centre...49F38A36D.ashx
Seems the cause of failure lies in
All SA wind turbines have a control system that takes action if the number of ride through events in a specific period exceeds a preset limit
20MW was off line due to high winds >90kph. Thermal power remained connected unit the interconnector blew.
Still not known at what point the towers collapsed. Seems the "Australian" might not be so far off the mark after all
certifs
Although not confirmed information, AEMO notes there have been anecdotal references made to tornado weather conditions in reports relating to the SA events. It is not yet clear whether those conditions potentially contributed to the line faults or whether the transmission towers collapsed after the Black System.