I agree that it is great news, I wish they were a bit more open with some of the details (charge rate? discharge rate?) 90 Wh&#x2F;kg is decent, a one day supply for a nominal house[1] that would be 266kg of batteries (about a quarter ton) which seems pretty reasonable. Sodium is highly reactive which is an issue but unclear if its any worse than Lithium in that regard.<p>[1] For reasons I don&#x27;t know, the &quot;nominal&quot; single family house consumes 24kwhrs per day, hence each kW of generating capactity is said to support 1 house.