Any power routed through batteries is expensive - compared with power pulled directly from grid / solar panels etc. Sodium ion batteries won't change that equa

Any power routed through batteries is expensive - compared with power pulled directly from grid / solar panels etc. Sodium ion batteries won't change that equation any time soon. But they can make whatever grid storage is installed (whether in homes, electric car, or grid scale), a lot cheaper. Some limited amount of such storage + some smarts to control when heavy users are run & when batteries are (dis)charged, can go a long way. Just 'flattening the curve' is enough.