Quote:
Originally Posted by PaperBagger'14
I was told it was a trip on 120L which ties BC and Alberta together, but AESO expects power to begin being restored around 4:30. It may take longer than that for some areas as it's a gradual shift when restoring bulk levels of power.
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MATL tripped at the same time, which makes me think that some event happened in the US.
You are probably right that it was a frequency excursion which then tripped a bunch of substations.