Kilowatt-hour and Kilowatt hour

Kilowatt hour and kilowatt-hour are semantically related. In some cases you can replace phrase "Kilowatt hour" with "Kilowatt-hour", this phrases are similar.

Kilowatt hour noun - A unit of energy equal to the work done by a power of 1000 watts operating for one hour.

Kilowatt-hour and kilowatt hour are semantically related. You can use "Kilowatt-hour" instead a noun phrase "Kilowatt hour".