Grand Coulee Dam became the largest electric power-producing facility in the United States in 1974.
== Expansion ===== Third powerplant === After World War II, the growing demand for electricity sparked interest in constructing another power plant supported by the Grand Coulee Dam
Grand Coulee Dam flooded over 21,000 acres (85 km2) of prime bottom land where Native Americans had been living and hunting for thousands of years, forcing the relocation of settlements and graveyards

