» Generating Capacity » Porto Colômbia Hydroelectric Plant

Low head hydroelectric power stations are a rarity in Brazil. Porto Colômbia is the only plant of this type in the FURNAS system. Since construction began in March 1970, the Porto Colômbia Plant has broken a number of records, especially for finishing construction well ahead of its original timetable.

Located on the Grande river, between the regions of Planura (MG) and Guaíra (SP), it was built to take advantage of the highly regular outflows from the Furnas Plant reservoir. The Porto Colômbia dam forms a lake covering 143 km² and is another important point from where the Grande river can be controlled.

The plant began commercial operations in June 1973 and in January 1974, it reached its full generating capacity of 320 MW (4 x 80 MW).


TECHNICAL DATA

DAM

Type: clay, homogenous fill
Max. height: 40 m
Length of the crest: 1,652 m
Crest width: 10 m
Crest height: 469.7 m
Total volume: 2,736,497 m³

RESERVOIR

Maximum storage level: 467.2 m
Maximum flood level: 467.2 m
Minimum operating level: 465.5 m
Flooded area: 143 km2
Total volume: 1.525 billion m³
Operating volume: 2.335 billion m³

CONCRETE STRUCTURE

TRANSITION WALLS AND SPILLWAY

Type: gravity
Length of the crest: 184 m
Crest height: 469.7 m
Total volume: 88,011 m³

SPILLWAY

Maximum discharge: 16,000 m³
Flood gates:
Type - segment
Quantity - 9
Size:
Width - 15 m
Height - 15.4 m
Radius - 15 m
Manufacturer: ATB (Brazil and Italy)

POWER STATION

Type: covered
Size: 170 m x 17 m
Generating units:
Quantity - 4
Rotation: 85.7 rpm
Rated power: 80 MW
Turbines: Kaplan type
Rotor diameter - 7.7 m
Manufacturers - Nohab/Sweden and Bardella/Brazil
Generators:
Frequency - 60 Hz
Terminal voltage - 13.8 kV
Manufacturer - Asea/Sweden
Transformers: 5 (operational plus reserve)
Type - three phase
Total operating capacity - 336 MVA
Transformation ratio: 13.8/138 kV
Manufacturer: ABB