[jacquesm]

There is still one more possible alternative, if only we can get the physics to work: room temperature super conduction. That - if it ever comes to fruit - is going to cause a whole pile of revolutions and unlike most other ideas that rest upon unobtanium actually has a chance of success.

[cwkoss]

How would room temperature super conduction be used for energy storage?

Or would it just make all of the other technologies much more efficient?

[jacquesm]

Energy storage in superconducting loops. This is done on a small scale already for ride-through and power stabilization purposes but it is expensive due to the non-room temperature super conducting technology used which requires cooling down the superconductor.