Intra-day storage — soaking up solar at the middle of the day to be released in the evening and overnight — is perfectly feasible using lithium-ion or sodium-ion batteries, which are getting cheaper and cheaper. But what happens when there are prolonged spells where there is little solar, no wind, and high demand because it's cold, what the Germans have dubbed dunkelflaute (doonkel-flowta)? For that we need long-duration storage, which I've talked about before.
One of the options for long-duration storage is the iron-air battery. And it's now in commercial production in the US. The video below from Just Have A Think discusses it.
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