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pspahn t1_irwn9qz wrote

> but I haven't really heard or seen anything about it since I read about it in like a scientific american or something some 20 years ago.

There are plans to convert a retiring coal plant in Colorado to salt storage:

https://www.cpr.org/2021/09/07/hayden-generating-station-coal-plant-could-become-a-massive-battery-for-renewable-energy/

The coal plant has two units that will retire in 2027 and 2028.

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