Californian earthquakes convinced most that the grid fails pretty catastrophically.

It's at that point that the grid-supported schemes revealed themselves to be sources of ignition.

To top it all off, the manufacturers of the grid, itself, wanted no part of the liability that would come from sanctioning such a scheme. (Johns Manville, IIRC.)

So when the question was put to them they rejected the whole idea.

Imagine what the politics must have been. JM (and others) all denying that their product was ever engineered to tolerate such a burden. ("...And thanks for finally asking us about it.")



Tesla