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 one hour, illustrating its significance in energy planning and management. In the energy industry, GWh is often used to compare the output of power plants or the energy needs of cities. For example, a coal-fired power plant might produce several GWh of electricity daily, while a battery storage system may store energy measured in GWh to supply during peak demand times.