One that possesses great force or energy: She is an editorial powerhouse.
power plant n.
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.
[pou-er-hous] 
ərˌhaʊs