[8bitsrule]

If by 'battery' s/he means any means of storing energy until it's needed, then of course 'batteries' will win. S/he seems to be thinking of electrochemical batteries ... going by some of the assertions ... but never spells that out.

There are many ways to store energy that can be more overall efficient (no hint of their existence in his piece) and would be considerably cheaper. How 'transmission vs. storage' is 'controversial' escapes me. Perhaps for the circles s/he travels in, and is selling to, it is.