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The best number I've heard for the Australian battery is $500/kWh after full installation. Individual battery cells are less, but inverters, packaging, and heat control add up.

I'd guess that for a big install they could probably get closer to $350/kWh these days, but that's a WAG.

So one of these units would cost 1-1.5 million (if my math is correct) - that doesn't actually sound too expensive for utilities like this, especially given how operating costs would be lower than the gas peaker wotsits that were mentioned earlier.

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