In Japan the technology that is installed is sodium-sulfur [1] It operates at 350 celcius, is full of dangerous chemicals and require a certain size to be inte

In Japan the technology that is installed is sodium-sulfur [1] It operates at 350 celcius, is full of dangerous chemicals and require a certain size to be interesting, but under these conditions, it seems to beat other techs [1] https://en.wikipedia.org/wiki/Sodium%E2%80%93sulfur_battery https://en.wikipedia.org/wiki/Sodium%E2%80%93sulfur_battery