Seems like this is a similar setup but different chemistry along the lines sodium-sulfur batteries (which are a molten salt). I had thought sodium-sulfur batter

Seems like this is a similar setup but different chemistry along the lines sodium-sulfur batteries (which are a molten salt). I had thought sodium-sulfur batteries were already at or better than $500/kWh; pretty sure new generations will be. There's already several hundred MW of NaS installed already.