I enjoy a power outage, at least unti the freezer thaws out. Candlelight dinner and conversation around the fireplace is always a nice change.
In regard to the battery banks supplying power during an outage - as Kevin mentioned, there are some issues with this.
However - battery banks will be a used during a power shortage. It is often a shortage of power that causes system instability which progresses to generator shutdowns and blackouts. Battery banks will stabilize the system, as wind and solar power fluctuate their electricity output.
Tesla has just installed a 129 MWhr lithium-ion battery bank here in South Australia exactly for this purpose.
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