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| São Simão Dam | |
|---|---|
| Name | São Simão Dam |
| River | Paranaíba River |
| Location | Minas Gerais / Goiás, Brazil |
| Type | Concrete gravity |
| Length | 830 m |
| Height | 127 m |
| Spillway | Controlled gates |
| Reservoir | São Simão Reservoir |
| Construction begin | 1973 |
| Opening | 1978 |
| Owner | Eletrobras Furnas |
| Plant capacity | 1,710 MW |
| Turbines | 6 × 285 MW Francis |
São Simão Dam The São Simão Dam is a large concrete gravity dam on the Paranaíba River in southeastern Brazil, forming the São Simão Reservoir and hosting a major hydroelectric power station. The project integrates regional water resources and power infrastructure and has been influential in Brazilian energy planning, regional development, and environmental policy debates involving federal and state agencies.
The dam sits on the Paranaíba River near the border between the states of Minas Gerais and Goiás, approximately downstream of the municipality of São Simão, Goiás. The site lies within the Plateau of Central Brazil and is connected by road and transmission corridors to cities such as Uberlândia, Catalão, and Goiânia. The project was part of a sequence of large hydro projects during the 1960s–1980s energy expansion that included works like Itaipu Dam and Balbina Dam and involved federal bodies such as Eletrobras and regional operators like Furnas Centrais Elétricas.
Designed as a concrete gravity dam, the structure was engineered to resist hydrostatic loads using its mass and foundation contact, drawing on techniques developed for dams like Marimbondo Dam and Cana Brava Dam. Detailed planning involved Brazilian engineering firms, input from international consulting groups, and oversight by agencies including Ministério de Minas e Energia and state secretariats. Construction commenced in the early 1970s with civil works, diversion tunnels, and cofferdams; notable contractors included national heavy construction firms that had worked on projects such as Itaipu and Sobradinho Dam. Key milestones matched national infrastructure programs under administrations of Emílio Médici and Ernesto Geisel during the military regime era, and safety standards referenced international practice from organizations like the International Commission on Large Dams.
The impoundment created the São Simão Reservoir, altering the hydrology of the Paranaíba Basin and connecting to regional basins that feed the Paraná River system. Reservoir management coordinates flood control, seasonal storage, and navigation considerations with agencies including the National Water Agency (Brazil) and local water authorities in Minas Gerais and Goiás. Hydrological studies drew on methodologies used in assessments for Tocantins River projects and incorporated data from research institutions such as the Brazilian Agricultural Research Corporation and university groups at the Federal University of Minas Gerais and University of Brasilia.
The power plant houses six vertical-axis Francis turbine-generator units, each rated at approximately 285 megawatts, yielding an installed capacity near 1,710 MW. Equipment suppliers and turbine manufacturers included firms with histories supplying units to projects like Itaipu and Sobradinho, and generation integrates into the national grid operated by Operador Nacional do Sistema Elétrico. The station’s hydro-mechanical design references precedents in machine hall layout and penstock engineering similar to installations at Balbina and Marimbondo, while electrical systems interface with high-voltage substations and long-range transmission lines connecting to the Southeast–South Interconnected System.
Ownership and operation have involved state-controlled utilities and federal holding companies, principally Eletrobras and its subsidiary Furnas Centrais Elétricas, with regulatory oversight by the National Electric Energy Agency. Operational protocols align with national energy policies set by the Ministry of Mines and Energy and market rules administered by Câmara de Comercialização de Energia Elétrica. Maintenance programs reflect standards promoted by trade associations such as the Brazilian Association of Hydropower and professional societies at the Brazilian Association of Technical Standards.
Impacts of the reservoir included displacement of communities, changes to fisheries, and effects on riparian ecosystems, issues that prompted involvement from NGOs and academic groups including Socio-environmental National Institute and researchers at the Federal University of Goiás. Resettlement and compensation policies engaged municipal authorities of São Simão, Goiás and state governments, while biodiversity assessments referenced studies from institutions like the Brazilian Biodiversity Fund. The project intersected with policy instruments such as environmental licensing administered by IBAMA and discussions around river basin management under the National Water Resources Policy.
Operational incidents have been limited but include episodic spillway releases and maintenance-related outages, requiring emergency response coordination among municipal civil defense units in Minas Gerais and Goiás and national agencies like the National Civil Aviation Agency for coordination of aerial surveys when needed. Safety measures encompass regular inspections, instrumentation for deformation monitoring, and compliance with guidelines from the International Commission on Large Dams and the National Dam Safety Program (Brazil), along with contingency planning involving local municipalities and utility emergency teams.
Category:Dams in Brazil Category:Hydroelectric power stations in Brazil Category:Buildings and structures in Goiás Category:Buildings and structures in Minas Gerais