In today's local paper there was an article on a 90+ yr old scientist who still works at Livermore Labs, a place that as I recall is guarded by a 30mm gatling gun mounted on a truck.
This scientist has worked in the fusion field, but more recently has been using some combination of flywheels and static electricity to store energy. He said energy would eventually be almost free because now it will be feasible to store solar, etc. energy without needing giant batteries. He said this would be demonstrated soon.
So, our future Tesla might not have a battery at all, just a spinning ball of static electricity in a container.
I presume Musk runs in these circles and is aware of the potential. Another thread mentioned the Tesla skunk works and this is the sort of thing that might be found in it.
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