Your question reminds me of the most important lesson my intro to engineering professor taught us. The answer to every question is, "well that depends." This one seriously depends. Your location, house size, appliance configuration, and living habits will all have dramatic affects on your electical usage. I think my bills up in Alaska ranged from an average of 5-10 kW average to 35+ in the winter.
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1 kilowatt hour = 3,600,000 Joules 1 Tetrajoule = 1,000,000 Joules 1 kilowatt hour = 3.6 Tetrajoules
Multiply by kilovolts, and you will have it. For example: 1 amp hour X 0.120 kilovolts = 0.120 kilowatt hours
Watt, kilowatt, or megawatt are units of power (energy/time). A watt is 1 joule/second. A kilowatt is a thousand joules per second. A kilowatt is also 1 kWh/hour (kilowatt-hour / hour). Since you would usually pay per kilowatt-hour, you might be more interested in the number of kilowatt-hours. A megawatt is a million joules per second - or a thousand kWh/hour.
a kilowatt hour measures electrical usage in the home usually 600 to 1200 kwh for the average home
If a kilowatt-hour is 10 cents, then 3.9 billion kilowatt-hours (billion meaning 109) has a value of 0.390 million dollars, or 390 million dollars.