Are you looking more at a Business Continuity (BC) plan here, or a Disaster Recovery (DR) situation?
You'll need to consider different things for each; bootstrapping from nothing vs holding over until things come back are wildly different scenarios.
For the DR piece I'd go looking for papers put out following major disasters in your (extended) area, and seeing where your piece of this would fit in to what's been looked at and analysed by those who've gone through it. As example, the Christchurch earthquakes provided excellent information to consider institutional responses in Australia.