I will hold my judgement, but there is something that I call poison power that could enter the grid and destabalize it without tripping any safeties. It is possible, but I will withhold furthur comment until we get a better handle on this.
If it happened we would know and it would be a international incident for sure.
Geez, I just read a thread about a GM plant in Ohio .. I've lost count on how many stories are out there