A really interesting application of this came to mind that seems like an optimal use of this “iron heat battery” from a pure physics perspective. Each kind of

A really interesting application of this came to mind that seems like an optimal use of this “iron heat battery” from a pure physics perspective. Each kind of “energy storage application” can be broken down into different properties /requirements that can vary quite a bit. Real time electricity response for 2-8hr periods so far seems well suited for Li-ion (LFP), given it is electrical energy, speed of response, and that it can be deployed virtually anywhere. On the opposite end of the spectrum - you have seasonal energy storage (winter in colder climates, for example). When thinking about “energy containers” - Having iron powder doesn’t have the same requirements of alternatives I’ve heard, and seems like it could be the easiest to scale. Physically storing heat requires very large well insulated structures (rocks underground I’ve seen), hydrogen requires compressed gas cylinders, pumped hydro and compressed air needs specific geology (large valleys or large sealed underground caves). Iron powder? An oxygen free warehouse Amazon sized. Helped that many winter applications ultimately only need heat, this seems like a good candidate that could be rapidly deployed given how on a relative basis - capital light and material accessible this is.