A megawatt-hour (MWh) is a unit of energy that represents one megawatt of power used for one hour. It is commonly used to measure electricity generation and consumption. For example, if a power plant generates 1 megawatt of electricity continuously for one hour, it produces 1 MWh of energy. In practical terms, 1 MWh can power about 330 average homes for one hour, depending on their energy usage. This measurement is important for utilities and energy providers to track and manage electricity supply and demand, ensuring that there is enough energy available for consumers and businesses.