A gigawatt-hour (GWh) is a unit of energy that represents one billion watt-hours. It is commonly used to measure large-scale energy production or consumption, particularly in the context of electricity generation from sources like solar power, wind energy, or nuclear power. One GWh can power approximately 330,000 homes for an hour, making it a significant measure in the energy industry. In practical terms, gigawatt-hours help utilities and energy companies track and manage electricity supply and demand. For example, a power plant might produce several GWh of electricity daily, which is crucial for planning and ensuring a stable energy grid.