The Brazilian government has suspended the auction of the 6.1 GW Sàƒ£o Luiz do Tapajàƒ³s hydroelectric plant earmarked for December.
The Mining and Energy Ministry cited a need for changes to a study into the impact on indigenous communities, according to state media service Agàƒªncia Brasil.
A new date for the auction was not given.
The announcement comes a day after environmental lobby group Amazon Watch accused Brazil of “flouting” international law by failing to properly consult local communities about the project.
The Sàƒ£o Luiz do Tapajàƒ³s project forms part of an 11 GW mega-dam complex earmarked for the Tapajàƒ³s and Jamanxim rivers in Brazil’s northern state of Paràƒ¡. It will comprise seven independent power plants and is expected to attract investment of $9 billion.