kilowatt-hour

By surface analysis, kilowatt +‎ hour, or, by surface analysis, kilo- +‎ watt-hour.

kilowatt-hour (plural kilowatt-hours)

2. A unit of energy equal to that provided by one kilowatt acting for one hour.

   Alternative forms: kW·h, kW h, kWh, kW-hr, kWhr (symbols); kilowatt hour

   Holonyms: megawatt-hour < gigawatt-hour < terawatt-hour

   Meronyms: milliwatt-hour < watt-hour

• The unit is often used to measure electrical consumption on an electricity meter, for which domestic consumers are charged.
• The orthographic variants of the symbols (e.g., kW·h, kW h, kWh) are explained in Wikipedia at kilowatt-hour § Unit representations.