What the heck is a kilowatt-hour (kWh)?
The worldwide standard of measuring electricity is a kilowatt, which is abbreviated as kW. One kilowatt is equivalent to 1,000 watts sustained for an hour.
Your local delivery company (utility) and your supply company will both charge you based on your energy usage – how much electricity you consume each kilowatt-hour (kWh). For instance, each hour a 100-watt light bulb consumes 100 watts or 0.1 kilowatts. It will take the bulb 10 hours to consume 1 kWh. So, if the electricity company charges $0.12 for 1 kWh, you will end up paying $0.12 for using the light bulb for 10 hours.