Mine went up $21 for June from last year and all my charging was at home on L1. However, that was for a 30-day period with 28 days in one set of TOU rates (spring) and 2 days in the summer rate schedule (same TOU plan). I didn't get my Leaf until 6/4, so there were about 6 days of the billing period with no Leaf (but the whole period was on TOU, PG&E E9A). Even though I can pretty well identify my kwh usage, it is not so easy to identify the cost because I am not just charged with off-peak rate but the rate is altered by the total amount of usage because it pushes me into Tier 3 in some cases or at least boosts the % of use that is in Tier 2, so that increases the rate I am paying for usage during the day, not just charging the Leaf. Also, our freezer was found popped open overnight or during the day four times during that period for reasons we still don't understand. Something must have been packed in there too tight and the pressure opened the door, but that meant hours of extra power usage on this bill. My mileage is also quite low, maybe 350 miles on that billing period. The bottom line is, just look at the billing amount and don't go crazy trying to calculate to the penny what charging is costing. It's somewhere between 1/5 and 1/10 the cost of gasoline for the same miles, and that's good enough for me.
Correction, Tier 1 and Tier 2 have the same rates. It's only if I go into Tier 3 that the rates change, but they go up the same amount from Tier 2 to 3 as they do going from off-peak to part-peak. That means there is no advantage splitting the charge over midnight, taking some in Part peak (e.g. 10pm to midnight) to keep in Tier 2 both days. Whatever you save by avoiding Tier 3 you pay out in the higher rates for part peak.
