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Of course you can't do blast furnace with a sand battery. But there is still a sizable market for industrial heat in between 100c <> 400c.

Pump water through, producing steam to drive a turbine, use turbine to generate electricity, use electricity for industrial process.

Now, in practice you _probably_ don't want to do this, because, in this case, you have district heating demand, which is a far more efficient use of the power.

Steam?