How much does electricity cost retail per kilowatt?

The cost of a kWh depends on several things. a) do you have very large peak loads, b) what is your annual demand, c) what is the cost of the supply lines to your site. And so on.

In Wanaka, New Zealand, a domestic consumer using less than 8 000 kWh per year, we pay NZ 28c per kWh for 'on-demand' power, and 21c per kWh for 'off-peak controlled' power (Hot water heating).

If you have large peak demands, then you'll put great demand on the lines and supply system, but which is going to be idle for most of the time. But it has to be paid for.