[api]

Where’s profitable crypto mining when you need it?

Back yard plasma furnace? Artificial diamond making? Aluminum smelting?

[HPsquared]

Even just a large water tank which you can choose when to add heat.

https://en.wikipedia.org/wiki/Seasonal_thermal_energy_storag...

[leonidasrup]

There are may different energy storage systems.

https://en.wikipedia.org/wiki/Energy_storage

There have wildly different prices for unit of stored energy and wildly different storage times.

https://css.umich.edu/publications/factsheets/energy/us-grid...

It's not cost effective run aluminum smelting only during peak electricity production.

[rcxdude]

You need something that's valuable, energy intensive, easy to stop and start, and cheap to build capacity for. Either or both of those last two tend to be the problem for most industrial processes (and also crypto mining).