You can calculate power consumption with the following formula

Power Usage in kW * 24 * Power Price = daily power cost

So your power cost per day would be as follows:

1.4 * 24 * 0.22 = 7.392

correct me if I'm wrong

for antminer S2,

Daily usage = 1.4 * 24 = 33.60 kWH

Monthly usage = 33.60 * 30 = 1008 kWH

This is the tariff that I get from my energy service provider website:

1) First 200 kWh (1-200 kWh) per month: (200 * 21.80)/100 = $ 43.60

2) Next 100 kWh (201-300 kWh) per month: (100* 33.40)/100 = $ 33.40

3) Next 300 kWh (301-600 kWh) per month: (300* 51.60)/100 = $ 154.80

4) Next 300 kWh (601-900 kWh) per month: (300* 54.60)/100 = $ 163.80

5) Next 901 kWh onwards per month: (108* 57.10)/100 = $ 61.67

Usage = 1008 kWH

Total = $ 457.27