- the entire apparatus serving as the source of power for some particular operation: the power plant of an automobile
- ☆ a building where power, esp. electric power, is generated
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- All the equipment, including structural members, that constitutes a unit power source: the power plant of a truck.
- A complex of structures, machinery, and associated equipment for generating electric energy from another source of energy, such as nuclear reactions or a hydroelectric dam. Also called powerhouse, power station.