Im not sure he's right about the turbine portion. We export power using boilers and steam turbines. If a plant turbine goes down and fails to be synchronized to the grid, it throws the massive breakers out in the sub station. If the grid was using much of our load and the grid can't support the demand, the grid sees brown outs and the operators of the grid can divert power to special customers first (industry) and fuck residential of some power.
And turbines slow down quick as fuck if the steam valve is shut and the exciter is still live on the generator.