Possible, yes, certainly, but at what expense? My back of the envelope calculations are for a reasonably large house it would cost ~1/4 of the value of the hou

Possible, yes, certainly, but at what expense? My back of the envelope calculations are for a reasonably large house it would cost ~1/4 of the value of the house for the properly sized and set up solar plus storage to go completely off-grid. That's without any concessions on the demand end, just plug and go. But it seems reasonable if you were sufficiently far off grid. Certainly there are places where it is financially far better, witness some people getting $350k estimates for extremely rural properties to run a power line.