Itaipú Dam(ētī`po͞o), hydroelectric dam on the Paraná River, on the Brazil-Paraguay border. Jointly constructed (1975–91) by Brazil and Paraguay, it is the second-largest hydroelectric dam in the world, exceeded only by the Three Gorges DamThree Gorges Dam,
607 ft (185 m) high and 7,575 ft (2,309 m) long, on the Chang (Yangtze) River, central Hubei prov., China, 30 mi (48 km) W of Yichang. The largest concrete structure in the world, the dam itself was constructed from 1994 to 2006.
..... Click the link for more information. . The dam is 4.8 mi (7.76 km) long and rises to a height of 643 ft (196 m). The power plant has a 20 generating units with a total production capacity of 14,000 MW. By the year 2000, the facility was generating some 94% of Paraguay's energy supply and about 20% of Brazil's. The Itaipú Reservoir, created by the dam, stretches nearly 100 mi (161 km) upstream; Guairá Falls is submerged by its waters.