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Use it directly, see my silbling comment.

so all such 'energy' storage are to be used as heat and no other form of energy? The name energy storage is somewhat confusing then, even if not incorrect? Heat storage would be more accurate iiuc.

No of course not. But using the heat directly is of course favourable, since you don't have conversion losses. But that doesn't mean you can't use it also to power turbines as you wish to.

The advantage of that type of storage is that it scales very well. Batteries are cool when space is an issue. But when it is not, digging out a hole and insulating it is surprisingly effective per unit of work stored there.

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