Grand Coulee Dam is a concrete gravity dam on the Columbia River in the U.S. state of Washington, built to produce hydroelectric power and provide irrigation water. Constructed between 1933 and 1942, Grand Coulee originally had only two powerhouses. The third powerhouse, completed in 1974 to increase energy production, makes Grand Coulee the largest power station in the United States by nameplate-capacity at 6,809 MW. Nameplate capacity is the theoretical output registered with authorities for classifying the unit. For electric power stations, the power output is in Megawatt electrical (MWe). For fuel plants, it is the refinery capacity in barrels per day.
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