As I said before, this seems to be the underlying cause of the power failures, the lack of redundancy in the power plant design and operational procedures. Of course it is important to find out what exactly caused the blackouts, but that would be just one of the many single points of failure that had existed in the power plant at that moment. If the HV bus tie breaker had an issue and opened unexpectedly, the end result would had been the same. Or if one of the running generators governor failed to full fuel. Or if one of the Automatic Voltage Regulators malfunctioned. Let’s hope that there is enough recorded data to reconstruct the chain of events.
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