For comparison, US grid capacity is about 1250 GW, average usage 500 GW.
So, this adds over two minutes of average usage.
https://seia.org/research-resources/energy-storage-market-ou... says total storage now is about 200 GWh, or about 25 minutes of average demand.
That means a huge ability to absorb production or consumption peaks!
Compared to what is this a good measure?
"How much is needed during a no sun and no wind period" could be reasonable comparison.
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So if ALL power generation of the US would stop right now, EVERYTHING would still have power for 25 minutes. (ignoring all safeties tripping, and perfect load balancing)
That sounds so impressive.