It depends on the electric bulbs, and many other equipments.
The price of electricity is getting higher and higher.
Hereby the rate of elictricity, you can calculate yourself if you know how many Kwh you use in one month.
1.For the first 100 kWh: 550vnd/kwh
2.From 101 - 150 kWh: 1.110vnd/kwh
3.From 151 - 200 kWh: 1.470vnd/kwh
4.From 201 - 300 kwh: 1.600vnd/kwh
5.From 301 - 400 kwh: 1.720vnd/kwh
I often use the heat, dryer, cake oven ...For example, my bill is 178 kwh this month, so I have to pay 166.826 vnd included 10% VAT.