This from your link...
“If a crisis looms in the Eastern Interconnection grid, FPL can immediately shut off two large 500-kilovolt transmission lines it owns that cross the state’s border near Jacksonville, according to Wiley.”
Sounds like the switch protected the north, this time.
Sounds that way, doesn’t it? Amazes me that FPL & PSC still haven’t attributed the source of the original ‘outage event’....may not find out ‘til they fix the transfer station in Miami, start up, and watch it hiccup again. The Florida PSC was due to complete their 2007-2016 Long Range Transmission Reliability Study, a steady-state assessment of Peninsular Florida’s transmission system to ensure that it remains stable under normal and emergency conditions, in March. This event may slow them down a little!