Peixoto Dam, also known as Mascarenhas de Moraes Hydroelectric Plant, is a hydroelectric dam on the Grande River in the state of Minas Gerais, Brazil, about 20 kilometres (12 mi) west of Delfinópolis.

[2] The first two Francis turbine-generators came online in 1957, and eight more were installed by 1968, bringing the plant to its full capacity of 476 megawatts (638,000 hp).

[1] The dam consists of a central concrete arch section flanked by gravity wings, totaling 50.6 metres (166 ft) high and 600 metres (2,000 ft) long, impounding the 145-kilometre (90 mi) long Represa de Peixoto (Peixoto Reservoir), with a storage capacity of 4.04 cubic kilometres (3,280,000 acre⋅ft) and a useful capacity of 2.50 cubic kilometres (2,030,000 acre⋅ft).

The service spillway, located on the north side of the dam, is an overflow structure with 11 gates, providing a maximum capacity of 9,350 cubic metres per second (330,000 cu ft/s).

The auxiliary spillway is located to the south and consists of a concrete chute controlled by two gates, with a capacity of 3,100 cubic metres per second (110,000 cu ft/s).