Kilowatt-hours
A kilowatt-hour (kWh) is the amount of energy when a power of one kilowatt (1,000 watts) is used continuously for one hour. Utility companies often bill consumers based on the number of kilowatt-hours consumed.
Megawatt-hours
A megawatt-hour (MWh) is the amount of energy consumed when one megawatt (MW) of power is used for one hour. It is used to measure large-scale energy production or consumption such as power plants.