Yes, this is energy storage, but a big tank to put salt in has the potential to be considerably cheaper than lithium ion cells. To your second point: all techn

Yes, this is energy storage, but a big tank to put salt in has the potential to be considerably cheaper than lithium ion cells. To your second point: all technologies have the property that we can't know for sure if they'll deliver on their promises without trying them, and the very reason we don't know in the case of nuclear is because opponents of nuclear power undermine attempts to try out novel architectures, pointing to limitations in current technologies as justification.