Na-S is less popular for new projects these days because of rapid decreases in the price of lithium batteries, but that's not a fundamental limitation of the technology — and we have no risk of running out of sodium nor sulfur.
In fairness, Japan's construction sector seems much healthier than that of the United States.
Japan's experience with sodium-sulfur batteries stands in contrast.
https://www.sandia.gov/ess-ssl/wp-content/uploads/2021/LDES/...
Na-S is less popular for new projects these days because of rapid decreases in the price of lithium batteries, but that's not a fundamental limitation of the technology — and we have no risk of running out of sodium nor sulfur.
In fairness, Japan's construction sector seems much healthier than that of the United States.