watt to kilowatt hours
Watt One terawatt hour is equal to a sustained power of approximately 114 megawatts for a period of one year. The watt second is a unit of energy, equal to the joule. One kilowatt hour is 3,600,000 watt seconds. The watt second is used, for example, to rate the energy storage of flash lamps used in photography, although the term joule is generally employed.