[jimworm]

Failure of imagination indeed. There's much more to energy than the regular usage cycle of the average electrical supply grid.

What if creating easily-fusable isotopes is the most efficient way to store "renewable" energy? Fusion is the most concentrated release of power humans are able to muster. What's to say such concentrated power will never be required for any purpose?

[anovikov]

That's totally right, fusion might have it's uses in the future. For example, the goal it was originally intended to be used when first tokamaks were created: cheap production of large amounts of tritium, enabling more compact thermonuclear bombs producing much less fallout with very flexible yields. Just not electricity production.