Powerhouse

Noun

 * 1) Any source of power, energy or strength.
 * The company has been a powerhouse in its industry for many years.
 * She's a powerhouse of ideas.

Thesaurus
Antaeus, Atlas, Briareus, Brobdingnagian, Charles Atlas, Cyclops, Goliath, Hercules, Polyphemus, Samson, Superman, Tarzan, Titan, activist, atomic power plant, ball of fire, beaver, big-time operator, bully, bullyboy, bustler, busy bee, central station, colossus, doer, eager beaver, enthusiast, giant, go-getter, gorilla, human dynamo, hustler, hydroelectric plant, live wire, man of action, man of deeds, militant, muscle man, new broom, operator, political activist, power plant, power station, stalwart, strong man, strong-arm man, take-charge guy, the mighty, the strong, tough, tough guy, tower of strength, wheeler-dealer, winner

Etymology
From power + house.