A megawatt is a unit for measuring power that is equivalent to one million watts.  One megawatt is equivalent to the energy produced by 10 automobile engines.

A megawatt hour (Mwh) is equal to 1,000 Kilowatt hours (Kwh).  It is equal to 1,000 kilowatts of electricity used continuously for one hour.  It is about equivalent to the amount of electricity used by about 330 homes during one hour.