Water (given enough volume) is a pretty good heat storage.
https://youtu.be/Bm7L-2J52GU?t=270
It can be a pretty good ‘battery’ too
https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...
It can be a pretty good ‘battery’ too
https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit...