powerhouse

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

Origin:
1880–85; power + house

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
powerhouse (ˈpaʊəˌhaʊs)
 
n
1.  an electrical generating station or plant
2.  informal a forceful or powerful person or thing

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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
  abroad.
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