If you want stored solar energy just use nuclear fission.
When they can synthesize the equivalent of gasoline, it will probably be one of the safest mobile energy sources available.
I’ve often wondered why they don’t create fission plants far far underground, where if there were a catastrophe the waste matter would be sealed in much like the remnants of hydrogen bomb testing back in the 50s-80s were done underground. I don’t know the physics of power transmission so I think that might be the problem, that is, power needs to be generated locally because transmission becomes too difficult and expensive?
“If you want stored solar energy just use nuclear fission.”
Nuclear is the elephant in many rooms.