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Iron can be produced from electricity as the article mentions, but most iron today is produced with coal, since its far cheaper.

This is just a way for the brewery to get cheap heat, with a level of indirection from the source coal so it can be advertised as green.

It's a shame the journalist that did this article didn't think to research how iron is typically made...

Once made and stuffed into this system, the iron can be used in an infite loop of combustion and restore using electricity when it's available.

Indeed, but the iron oxide powder resulting from this process would be cheaper to turn back into iron metal using coal in a regular blast furnace.

We'll they are trying to make it green as possible so coal if out of game. At least locally for one device.

The Oxygen too could be in the same infinite loop if there is some kind of storage large enough. (Salt mine?)

Then there would be NOx pollutants either.