Yes, I realise that. That's why I said "I don't know" and "for comparison".

My point was that GWh-scale thermal battery proposals would be competing with already existing (and possibly cheaper) chemical batteries, and that energy storage on this scale is not unheard of.

The point is that current energy storage facilities are too small for fully renewable grid (or arguably even 60% renewable grid).

Even as a nuclear supporter I would welcome more renewables if we had cheap scalable storage, which no one has it seems. (at least no one pointed out such project in the entire thread)

A minor caveat: some regions have large hydroelectric generation, which doubles as a great energy storage site. Countries seem to be able to manage a roughly 1:1 ratio between intermittent sources and hydroelectric generation. Sweden is managing to decarbonize it's grid with ~1/3rd each of nuclear, intermittent sources, and hydroelectric.

But for much of the world what doesn't have this option, nuclear remains the most viable energy source.

Yes, that's what I meant by "scalable". You can't just continue picking low hanging fruit forever.

Btw even the Sweden example uses nuclear for decarbonization of the grid ...