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The document's release follows the completion of a public consultation process in May, the group said in a statement.
The project forms part of an 11GW mega-complex earmarked for the Tapajós and Jamanxim rivers.
It will include seven independent power plants and is expected to attract investment of US$9bn.
The project has drawn opposition from green lobby groups and local residents, who say it would cause widespread environmental damage and social upheaval.
According to the federal government, a bid round for the facility could be held in December.
Results of the study, in Portuguese, can be seen here
BNamericas will host its 11th Southern Cone Energy Summit in Lima, Peru, on November 12-13. Click here to download the agenda.