I don't want to be 100% independent/isolated, but I'd like to be in a position to maintain a reasonable level of "normalness" in the event of an extended outage. I hope one day to get a gas powered generator like PersianKitty has - it's enough to power the whole house...
Rising [grid sourced] electricity prices are also a concern, a renewable energy setup like solar that may barely break even over its lifetime today could have its payback changed significantly by mains supply price increases.
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