Good topic, i was also wondering what we can do in NZ as I saw them talking about it on SimplyDiscus.com in America after the hurricanes they had, especially that one in New Orleans. The method of choice was generator, aside from that battery operated pumps just to run the air driven filters. The air is the most important thing you need as mentioned heat can stay a while with polystyrene, towels wrapped around etc.
Suphew I haven't seen the Geni's... I assume these are generators you can buy from Bunnings? How much? I have quite an investment here with discus so need to look at that. Hamilton is sweet for outages though, only an hour or two max usually, still makes you nervous the whole 'not knowing how long' aspect. What powers those Genis?