If the lights start going dim, what will happen is not the collapse of industrial society, but the collapse of the legal, economic and political barriers currently blocking great big dams and nuke plants. because while a quick-and-dirty nuke plant might not be as safe as could be desired, it will be a lot less fatal than trying to do without juice. The mortality rates of nations correlate very well with the reliability and potency of their electric grids, and that is not an accident