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$100/kWh would be something else.
For my own house, for example, I don't have a backup generator as my power is pretty reliable.
Right now I could put in a natural gas one for, say $4K that would run my house as long as the gas supply stays on.
Or, I could put in a 10 kWh battery for about $8-9K (installed cost) that would run some important circuits and re-charge from solar day by day.
No comparison.

But if the battery was even the same cost as the NG generator, I'd probably go with the battery.
And at $100/kWh, the battery would be much cheaper and then it's a no-brainer.
But IMO we need some technological breakthroughs to get to that level.

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