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> Meanwhile, stationary class (i.e. relatively poor energy density) iron air batteries are making commercial progress. https://pv-magazine-usa.com/2023/06/12/form-energy-to-deploy...

Also seems worth mentioning ESS. https://essinc.com/

They're a bit further along (scaling up from low-volume production, some installs in the wild) with a different approach to the use of iron (flow batteries).

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ESS should not be mentioned except as an example of how prone the green news cycle is to fraud. As I detailed last year, their claims are highly dubious:

https://news.ycombinator.com/item?id=31430227

(previously I misspelled the last name of Sri Narayanan as "Narayan", for which I belatedly apologize)

And that prediction was substantiated when they were subject to a class-action shareholder lawsuit in February involving a fabricated customer which was actually a subsidiary:

https://www.bloomberg.com/press-releases/2023-03-10/the-law-...

The other shoe has yet to drop, but I suggest that any battery company without publications should be considered with appropriate salinity.

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