noun, plural powerhouses [pou-er-hou-ziz for 1; pou-er-hou-siz for 2 ] .
Electricity. a generating station.
a person, group, team, or the like, having great energy, strength, or potential for success.

1880–85; power + house

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World English Dictionary
powerhouse (ˈpaʊəˌhaʊs)
1.  an electrical generating station or plant
2.  informal a forceful or powerful person or thing

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The unlikely but true story of your next favorite media powerhouse.
Yet if you look at all those powerhouse programs across the country, only seven
  or eight actually rake in money.
These distributed computing vendors all offer dual services, depending on how
  much of a processing powerhouse is required.
The country regards itself as an export powerhouse whose goods are prized
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