[tuatoru]

> "...what’s left to do is scale up from lab-scale prototypes to grid-scale power plants."

I'll make a note to check back in 20 years, then. :-)

I note they don't mention charge cycle durability - for grid, you'd want 10 000-ish cycles to 80% capacity. A bit of a red flag there.

Still, iron is cheap, plentiful, and environmentally benign. Even mining and refining iron ore isn't as bad as mining for many of the other chemistries, and we already mine a lot of iron, so there won't be shortages as it scales. I want this to work.

I note the web site[1] says its areal power intensity is about 3 MW per acre (presumably 300 - 450 MWh areal energy density, given the 100 - 150 hour claim), best case. They're not going to be installing this in Manhattan.

1. https://formenergy.com/technology/battery-technology/

[throwawayboise]

There are vast amounts of scrap iron in salvage yards all across the country. Might not need to mine anything at all.

[not_exactly__]

I share most of your skepticism. Do you know if they’ve published a technical paper on any of the numbers?