power plant

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun 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.
• noun All the equipment, including structural members, that constitutes a unit power source.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A station built for the production of electric power; a power station.
• noun The portion of a vehicle devoted to providing energy for motion; the engine or motor.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an electrical generating station