WordNet (r) 3.0 (2006):

power plant
    n 1: an electrical generating station [syn: power station,
         power plant, powerhouse]

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "power plant":
   action and reaction, aeromotor, appliance, armory, arsenal,
   assembly line, assembly plant, atomic energy plant,
   atomic power plant, bindery, boatyard, boilery, bookbindery,
   brewery, brickyard, cannery, central station, convenience,
   creamery, dairy, defense plant, distillery, dockyard, drive,
   engine, enginery, facility, factory, factory belt,
   factory district, feeder plant, fixture, flour mill,
   hydroelectric plant, industrial park, industrial zone, jet power,
   jet propulsion, machine, machinery, main plant, manufactory,
   manufacturing plant, manufacturing quarter, mechanical aid,
   mechanical device, mechanism, mill, mint, motive power, motor,
   munitions plant, oil refinery, packing house, plant, pottery,
   power source, power station, powerhouse, production line,
   push-button plant, ram-jet propulsion, reaction,
   reaction propulsion, refinery, resojet propulsion, rocket power,
   rocket propulsion, sawmill, shipyard, subassembly plant,
   sugar refinery, tannery, turbojet propulsion, utility, winery,
   yard, yards