I could see this being useful in places where day/night cycle is skewed to prolonged periods of each. Or perhaps holding excess power from summer into winter since days are so much shorter.
But yeah, this doesn’t really seem like the best way to store grid power.
Eh?
You take excess green power and use it to generate gasoline. You use that gasoline in a combustion engine. Where is the extra carbon coming from which makes this non neutral?