Not sure what you mean by demand charges. Additional cost for peak hours perhaps? Not really a thing where I live.
Energy is billed at the lower of the two numbers I gave for the first ~1.4MWh, then the rest is billed at the higher rate. (metered between two months) It doesn't matter when you use the energy.
Aside from the energy costs, there's a ~$0.22/day base charge and 5% gst. That's it.