[Sunnyflorida]

FPL just said a sub-station tripped. That would backload the generation plant and trip it. That would cause a big drain on the rest of the grid and that would take them down also. No big deal. More surprised it does not happen more often.

[Little Bill]

Probably has a large transformer go south. When one of these things self destructs you get a system transient, on a chart it looks like a big spike up and then down, Voltage.

Large Generators have over voltage and under voltage relays to protect the unit from these little buggers, big enough hit your out.