A megawatt-hour (MWh) is a unit of energy that measures the amount of electricity generated or consumed over one hour at a rate of one megawatt. One megawatt is equal to 1,000 kilowatts, so a megawatt-hour represents 1,000 kilowatt-hours. This measurement is commonly used in the energy industry to quantify electricity production from sources like solar panels or wind turbines. In practical terms, a megawatt-hour can power about 330 average American homes for one hour. Understanding megawatt-hours helps consumers and businesses track energy usage and costs, as well as assess the efficiency of different energy sources.