I just happen to have received my bill.
For a period of 59 days, with minor rounding:
Capacity 5.75kw for 45 days@ 0.065/kw/day
Then 5.75kw for 14days@ 0.1029/kw/day (no idea why there are two rates) =8.28
73kw@0.154=11.28
22.78kw@0.138=3.15 (again don't know why two rates)
Total so far 39.58
Elec tax @ 4.864% x 1.05=2.02(don't understand why 1.05 uplift)
Meter rental 59 days @0.0276=1.63
Subtotal 43.23
IVA@21%=9.08
Final total 52.31
Hope this helps!