Most interesting is how you need power to run the grid and start up power plants. Very few power plants in any grid have the black start capability, that is, to be able to start up without external power from the grid. Typically these are hydro power plants and plants equipped with impressive diesel aggregate generators. If the grid blacks out and the plants that are black start capable on paper have trouble starting, you're pretty much fucked. If all goes as planned, you get the black start plants online and use them to boot up the grid and start up the rest of the grid power supply.Worse, restarting the grid is increasingly complex.
Which brings us to the Venezuelan offline hydro plant: it's probably the primary black start plant for the entire grid.