The Balbina Dam is a hydroelectric dam and power station on the Uatumã River in the Amazon Rainforest, Brazil. The location is under the municipality of Presidente Figueiredo jurisdiction, in the state of Amazonas. It was built from 1985 to 1989 and is managed by Manaus Energia, under the Eletronorte system. The first of five generators began operating in February 1989. The dam has an installed capacity of 250 MW and floods a 2,360 km2 (910 sq mi) area.
The dam was established to provide a renewable electricity supply to the city of Manaus but was considered by locals a controversial project from the start, due to the loss of forest and displacement of tribal homes grounds. It was also criticized for its expensive construction and maintenance costs. I believe this dam now covers over 4000sqm and opperates at twice the depth as orinally told to the public,