"water is wet and all that..." ...and it's a very good energy store when much of your energy demand is for heating/cooling with target temperatures in the "hab

"water is wet and all that..." ...and it's a very good energy store when much of your energy demand is for heating/cooling with target temperatures in the "habitable zone". The only real challenge (but a big one) is getting the incentive structures right so that they are not "hacked" (e.g. pretending to be a dispatchable consumer at high supply but actually just switching to the conventionally billed socket at times of high demand) and keep inevitable oversteering/pork cycle within a reasonable margin.