» Generating Capacity » Marimbondo Hydroelectric Plant

The Marimbondo Plant was the fourth challenge in FURNAS' history, coinciding with the company reaching full maturity as an electric utility. Located on the Grande River, between the cities of Icém (SP) and Fronteira (MG), the Marimbondo Plant provides the second largest output of all of FURNAS' plants.

The transmission lines linking the plant to the grid were the first 500 kV lines built in Brazil and operating in Latin America, demonstrating once and for all the Brazilian firms were fully capable of designing, manufacturing and building electricity projects.

Work began in 1971. The first unit entered commercial operation in October 1975. In January 1977, all eight units, with an output of 180 MW each, were connected to the grid.



Type: clay, homogenous fill
Max. height: 94 m
Length of the crest: 3,100 m
Crest width: 10 m
Crest height: 450.5 m
Total volume: 14,400,000 m³


Maximum storage level: 446,3
Maximum flood level: 447.36 m
Minimum operating level: 426 m
Flooded area: 438 km²
Total volume: 6.150 billion m³
Operating volume: 5.26 billion m³


Flood gates:
Type - tracked
Quantity - 8
Water height above the sill - 37.3 m
width - 7.859 m
height - 12.067 m
Manufacturers: Bardella (Brazil) and Sorefame (Portugal)


Maximum discharge: 21,400 m³/s
Flood gates:
Type - segment
Quantity - 9
width - 15 m
height - 18.85 m
radius - 19 m
Manufacturer: ATB (Brazil and Italy)


Type: covered
Size: 250.2 m x 25.3 m
Generating units:
Quantity - 8
revolutions: 100 rpm
rated power. 180 MW
Type - Francis vertical axis
Rotor diameter - 6.500 m
Manufacturers: Voith consortium (Brazil and Germany), Neyrpic (France), Creusoti-Loire (France) and MEP (Brazil).
Frequency - 60 Hz
Terminal voltage: 13.8 kV
Manufacturer - Asea (Brazil and Sweden)
Transformers: 26 (operational plus reserve)
Type - single phase
Total operating capacity - 1519.92 MVA
Transformation ratio: 13.8/525 kV
Manufacturer: Tusa (Brazil)