Do you have a separate heater for each room?
That's my thinking, if you can use them precisely when needed.
Individual Heaters versus Ducts/radiators, I would think to be easier to install, especially if they are electric.
There's retrofitting involved
Certainly, I was more thinking of the building industry going forward in a greener way.
But the power grid is an excellent battery, it already exists
Glad you mentioned that one: Surely the grid doesn't store*, but can switch supply from multiple sources to meet demand? One of the proponents of wind power, which our politicians see as the way forward, when asked what happened when there was no wind, said that then the traditional power stations take over: Ignoring the fact that our coal/nuclear installations are largely becoming obsolete, with no firm replacement policy in use.
I'm sure that power companies are lukewarm about it, though. Effectively, they're buying power from you at consumer rates
Good argument and one I hadn't thought of.
*There's a hollow mountain in Wales that pumps water up and, when the peak demand arises, releases it back down to generate electricity, I don't know of any other storage method, but if we're going to rely on wind power, we desperately need to think of one!