That’s kinda why Tesla is doing what it’s doing. I’m not sure the exact production, but it looks like nearly 4 GWh in fixed storage last year, and at least 50 GWh (0.93 megacars * 54 kWh smallest battery) in their cars required the ability to rapidly make factories that can make batteries that could also be used in grid storage (I’m assuming making the batteries is the hard part of both electric cars and grid storage, if I’m wrong about that it breaks my argument).
(And inter-season storage is too high a threshold: not many people are living in the artic/antarctic circles away from grids connecting them to places that still get some sun even in winter).
Its a decent effort, but to put 4GWh in perspective: my small house requires about 10MWh in heating over the winter. I can reduce that with a heat pump by a factor 4, but that till means the storage is only enough for about 1800 homes.
We need a PWh+ of storage, and we need it in the next decade, and we are nowhere near on schedule.
(And inter-season storage is too high a threshold: not many people are living in the artic/antarctic circles away from grids connecting them to places that still get some sun even in winter).