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.
n. a very big strong person, usually a male. : Ted is a real powerhouse. I'd hate to have him mad at me.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[pou-er-hous] 
ərˌhaʊs