For me, the My BMW app still doesn't work wrt any Charging History or Charging Management function....I'm unaware of any US owner (of just the iX) where this function does work on the app. Anyone?
I've never seen any reference to "New Energy Tarrif" on my app, but maybe it will be a feature when then app is updated to fix the charging issue. (As an aside, where I live, in northern Virginia, my electricity supplier does not have 'peak hours' with higher rates, so any time of day or night I'm charged at the same rate, which, for me, is ~13 cents/kWh.)