'powerhouse' definitions:

Definition of 'powerhouse'

(from WordNet)
noun
A highly energetic and indefatigable person [syn: powerhouse, human dynamo, ball of fire, fireball]
noun
A team considered to be the best of its class
noun
An electrical generating station [syn: power station, power plant, powerhouse]

Synonyms of 'powerhouse'

From: Moby Thesaurus