In other words, they store the energy chemically. Interesting, maybe it is a clue how to make electric systems store energy when the sun isn't shining.
It's just not scalable yet. That's the truth of the matter.
> yet
There you go.
Correct but that means that no, we can't go all renewable right now. It actually means that when you add renewable, you're still about 70-80% dependent on natural gas (or coal) because of the very intermittent nature of solar/wind energy. And hydroelectric energy is (mostly, as some ecologist will protest) great but not scalable.
Not yet, but we're pretty close. We need about 300TWh of energy storage to decarbonize the grid, and about 300TWh to convert all transportation to EV. We currently produce about 1TWh per year of batteries, and that capacity is doubling every 14 months or so.