KILOWATTS/TIME (and not kilowatt hours) The Watt is the power attached (electrical, magnetic, mechanical, acoustic, wind) of SI (International System of Measures) equivalent to 1 July/second . Kilowatt is the equivalent of 1. 000 watts. Mw is the equivalent of 1. 000 . 000 watts. The Kilowatt/Hour is the unit of energy consumption per hour.