⋅ ABC News ⋅
The canadian premiere, of course, said it was a lightning hitting a power station on the "New York side of the Canadian-American border", something like that.
However, ABC News reports the authorities are not yet sure about the cause.More on this in a separate article [ABC news]. In addition, it seems the software and hardware safety system did not work as it was supposed to and failed to prevent the ripple effect.
Good news: air traffic control, many (why not all?) hospitals, financial institutions were operating on backup power, smoothly.
Good news: very little looting reported, so far (some in Detroit, I believe).
Total about 50 million people were affected.
Sources: [ABC News ⋅ ABC News ⋅ ABC News]