» Generating Capacity » Serra do Facão Hydroelectric Plant

The Serra da Mesa Hydroelectric Plant, located in the Alto Tocantins Basin in Goiás, is a very important part of the Brazilian energy grid. When its three generating units came online, producing 1275 MW, the plant became an essential provider to the South/Southeast/Midwest Interconnected System. Furthermore, it is responsible for connecting this system and the North/Northeast region, and is the hub for the North - South Interconnection.

The plant makes a significant contribution to the interconnected system (6300 GW/year) at a very competitive generating cost. Additionally, the dam exerts a certain amount of control over the river, directly benefiting plants located downstream, especially the Tucuruí Hydroelectric Plant in Para.

When Serra da Mesa came online, it became a definitive solution for meeting demand in the states of Goiás and particularly the Federal District.

This project marks the beginning of a new stage for the Brazilian Electricity Industry for two main reasons. The first is the level of automation used. This was a pioneering project for FURNAS, being an underground plant, with entirely digital controls that provide coordinated generating operation and a diversified transmission system.

Second, this plant was built in partnership with the private sector. In 1993, following a number of studies carried out by the DNAEE (National Department of Water and Electrical Energy) and Eletrobras, the federal government began a program which would bring together a state-run company and the private sector. Serra da Mesa Energia S.A. won the Partner Selection Process. It was responsible for concluding the plant and, in exchange, received 51.54% of the energy it produces.

FURNAS was responsible for managing the development and for plant operation, applying its extensive experience in managing and operating large projects.

FURNAShas always sought to preserve nature and promote ecological principles. The Serra da Mesa Plant, like the plants in Corumbá and Manso, are clear examples of this posture. The company has made commitments to a number of environmental bodies (the Goiás State Foundation for the Environment - Femago and the Brazilian Institute for the Environment and Renewable Natural Resources - Ibama) through 17 programs involving Wildlife and Wild Plant Conservation, Managing Indigenous Issues, Icthyofauna Monitoring and other activities.


TECHNICAL DATA

DAM

Type: rock filled embankment dam with a clay core
Max. Height: 154 m
Total volume: 12,057,558 m³

RESERVOIR

Maximum storage level: 460.00 m
Maximum flood level: (Maximum) 461.5 m
Minimum operating level: 417.30 m
Flooded area: (height 460.00 m) 1794 km²
Total volume: 54.4 billion m³
Operating volume: 43.25 km³

CONCRETE STRUCTURE

WATER INTAKE

Flood gates:
Type - penstock
Quantity - 03
Water height above the sill - 61.18 m
Size:
width - 7.65 m
height - 9.13 m
Manufacturer: BSI

SPILLWAY

Maximum discharge: 15,000 m³
Flood gates:
Type - segment
Quantity - 05
Size:
width - 15 m
height - 20.4 m
radius - 19 m
Manufacturer: BSI

POWER STATION

Type: underground
Size:
width - 29.20 m
length - 137.00 m
maximum height - 69.80 m
Generating units:
quantity - 03
revolutions: 120 rpm
rated power: 1,275 MW
Turbines:
Type - Francis vertical axis
Upper rotor diameter - 5,847.80 mm
Lower rotor diameter - 6,460.82 mm
Manufacturer - SADE
Generators:
Frequency - 60 Hz
Terminal voltage - 15 kV
Manufacturer - ABB
Transformers: 10 (operational plus reserve)
Type - single phase
Total operating capacity - 1,418.40 MVA
Transformation ratio: 15/500 kV
Manufacturer - ABB