Here's a highly technical blow-by-blow analysis of the August 2003 North American blackout: https://reports.energy.gov/BlackoutFinal-Web.pdf
Here are some of my favorite quotes: ..."At 13:30 EDT, the MISO EMS engineer went to lunch. However, he forgot to re-engage the automatic periodic trigger."
..."Also at 15:42 EDT, the Perry plant operator called back with more evidence of problems. “I’m still getting a lot of voltage spikes and swings on the generator . . . . I don’t know how much longer we’re going to survive.”
..."At 15:46 EDT the Perry plant operator called the FE control room a third time to say that the unit was close to tripping off: “It’s not looking good . . . .We ain’t going to be here much longer and you’re going to have a bigger problem.”
A great read both for its tutorial and historical value.