"insanely cheap energy"
Another place where the durn sine-tiss got it wrong. Even a decade ago almost no expert saw this coming this incredibly, or fast.
Seems mostly a matter of silo-ing. There were no major breakthroughs- just constant incremental progress. And the tech part aside, just ignored the sheer manufacturing economics of scale.
The only downside is that we're behind.
Didn't need to be. But remember when Turdy's handlers programmed him to broken record "Solyndra!!!?"