[otherotherchris]

Pretty much every iron chemistry has failed to reach market. I reckon they're probably just blowing smoke.

I really want them to succeed for the sake of the planet, but it's another "revolutionary new battery just five years away" story.

[jacquesm]

They're one step ahead of the vaporware stuff you normally read about in that they are already operating at a scale worth noticing (no long lab level power but 100's of KW) and they are about to scale up to 5MW which will be a very important proof point if it can be done economically and reliably enough.

[philipkglass]

They're still shipping small volumes but ESS Inc. has at least delivered some of their iron-based flow batteries:

https://essinc.com/