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| Itumbiara Dam | |
|---|---|
| Name | Itumbiara Dam |
| Location | Goiás/Goiás state |
| Coordinates | 18, 22, S, 49... |
| Status | Operational |
| Construction begin | 1968 |
| Opening | 1974 |
| Owner | Eletrobrás/Furnas Centrais Elétricas |
| Dam type | Embankment, rock-fill |
| Height | 80 m |
| Length | 6,000 m |
| Spillway type | Service, gated |
| Reservoir | Itumbiara Reservoir |
| Reservoir capacity total | 22.5 km³ |
| Plant operator | Furnas Centrais Elétricas |
| Plant capacity | 1,450 MW |
| Plant turbines | 6× Francis |
| Plant commission | 1974–1976 |
Itumbiara Dam is a large embankment hydroelectric dam on the Paraná River in the state of Goiás, Brazil. It impounds the Itumbiara Reservoir and supports a major hydroelectric power plant operated by Furnas Centrais Elétricas under the umbrella of Eletrobrás. The facility is a landmark project of Brazilian infrastructure from the late 20th century, integrating regional navigation, irrigation, and energy systems tied to the broader Brazilian energy policy and the National Interconnected System.
The project sits near the municipality of Itumbiara, straddling the border between Goiás and Minas Gerais and influencing nearby municipalities including Santa Helena de Goiás and Uberlândia. Planned within the matrix of Brazilian hydro projects such as Itaipu Dam, Balbina Dam, and Sobradinho Dam, the site was chosen for its geology and flow regime on the Paraná River catchment, adjacent to tributaries like the Rio dos Bois and Rio Paranaíba. The dam contributes to Brazil’s national grid alongside facilities operated by Companhia Energética de Minas Gerais and collective regional schemes involving ONS (Operador Nacional do Sistema Elétrico).
Feasibility studies in the 1950s and 1960s involved Brazilian agencies and international consultancies linked with projects such as Curuá-Una and Três Irmãos Dam. Construction began after licensing and consortia agreements including Furnas Centrais Elétricas, national financiers like Banco do Brasil, and engineering firms experienced on projects like Itaipu. Major civil works were executed in the early 1970s, with diversion tunnels, cofferdams, embankment placement, and concrete works supervised by contractors that had worked on Jupiá Dam and Cachoeira Dourada. The power plant units were commissioned progressively between 1974 and 1976, contemporaneous with expansions at Sobradinho Reservoir and upgrades to the National Interconnected System.
The dam is an embankment rock-fill structure with a central clay core, comparable in style to dams such as Cana Brava Dam and Rosana Dam. Its crest extends several kilometers across the floodplain, with an overall height near 80 m and a crest length of roughly 6,000 m. The spillway includes gated service bays, designed using hydrological criteria informed by studies like those for Volta Grande and Ilha Solteira Dam. The powerhouse contains six Francis turbine-generator units, each specified and supplied by international manufacturers previously contracted for plants like Itaipu and Balbina, with cumulative installed capacity near 1,450 MW. Auxiliary systems parallel those installed at Furnas facilities including switchyards synchronized with lines to Brasília, Belo Horizonte, and São Paulo.
Electricity from the plant feeds the National Interconnected System and supports urban centers including Goiânia, Brasília, Uberlândia, and industrial hubs such as Anápolis. Generation profiles vary seasonally with the Paraná River hydrology, similar to operational patterns observed at Itaipu and Três Irmãos. The plant has provided baseload and peaking capacity integrated into dispatch managed by ONS (Operador Nacional do Sistema Elétrico), and has been subject to modernization initiatives akin to upgrades implemented at Furnas units across the southeast region.
The reservoir formed by the dam ranks among the larger artificial lakes in Brazil, with total storage on the order of tens of cubic kilometers and an extensive shoreline that affects municipalities like Itumbiara (city), Morrinhos, and Catalão. Its hydrological regime is driven by the Paraná River basin dynamics, rainy-season inflows from the Cerrado highlands, and seasonal variability managed in coordination with upstream reservoirs such as Cachoeira Dourada and downstream works like Jupiá. The impoundment altered sediment transport and thermal stratification, prompting monitoring programs similar to those established for Sobradinho and Balbina.
Creation of the reservoir produced ecological shifts affecting Cerrado habitats, riparian corridors, and fish species also recorded in studies of the Iguaçu and São Francisco basins. Resettlement and compensation processes involved affected communities in Itumbiara (city), Santa Helena de Goiás, and rural districts, paralleling social programs undertaken for projects like Balbina and Três Irmãos. Environmental assessments and mitigation measures have engaged institutions including Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis and state secretariats from Goiás and Minas Gerais, with ongoing initiatives for fisheries management, reforestation, and water-quality monitoring comparable to programs at Furnas reservoirs.
The reservoir and adjacent infrastructure support boating, sport fishing, and events that attract visitors from Goiânia, Brasília, and Belo Horizonte. Marinas, resorts, and municipal parks in Itumbiara (city) and Morrinhos host activities similar to recreational developments at Itaipu Lake and Sobradinho Lake. Local festivals, angling tournaments, and eco-tourism excursions link to cultural nodes such as Parque Nacional da Chapada dos Veadeiros and promote regional hospitality sectors tied to transport corridors like the BR-153 and BR-050.
Category:Hydroelectric power stations in Brazil Category:Dams in Goiás