Cooling pond

Mount Storm Lake is a 1,200-acre (4.9 km2) cooling pond for a coal synfuel power plant in Grant County, West Virginia.
Cooling pond of the Balakovo Nuclear Power Plant in Russia

A cooling pond is a man-made body of water primarily formed for the purpose of cooling heated water or to store and supply cooling water to a nearby power plant or industrial facility such as a petroleum refinery, pulp and paper mill, chemical plant, steel mill or smelter.