Some of the problems discussed had to do with getting the different type of generators restarted, Steamline ruptures, purging and re-energizing some liquid-filled power lines (?) stabilizing frequency as things were started up and loads were added.
It seemed like they had to be very careful about what they did until they were re-connected to the main grids, because unbalances could easily cause frequency change and automatic load-shedding or over/under frequency relays to drop out and shut things down again.
He used an analogy to describe how important the stability of being connected to the main grid that I don't know how accurate it is but I thought was great. It was something like this:
Picture the load as being a child jumping up and down on a bed. Picture the generating plants across the country all connected together as a 100 pound weight. When the child jumps up and down on the bed it doesn't have much effect on the weight. Now picture unconnected generating plants as 100 one pound weights. Each time the child jumps on the bed some will fall off until all are gone.
Bill