Brazil's Supreme Court has approved the resumption of work on the controversial 13 billion dollars Belo Monte dam in the Amazon, which was stopped earlier this month after protests from indigenous groups.
This week's preliminary ruling overturned an earlier ruling from a lower court that ordered construction of the dam, which crosses the Xingu River, to be stopped until local indigenous peoples could testify before Congress.
Supreme Court President Carlos Ayres Britto's decision could still be revised, however, when the case is further examined by the court.
The Belo Monte dam has claimed years of high-profile criticism, with the likes of Hollywood director James Cameron, actress Sigourney Weaver and the Inter-American Court on Human rights opposing its construction because they say it would displace indigenous people living in the Amazon rainforest.
President Dilma Rousseff has said mega dams like the Belo Monte are needed to meet Brazil's growing energy demands.
But the indigenous groups have said they fear the dam will harm their way of life, and environmentalists are concerned about deforestation, greenhouse gas emissions and irreparable damage to the ecosystem.
Belo Monte is set to start producing electricity in 2015 and is expected to produce 11,000 megawatts of electricity. It would be the third-largest dam in the world, after China's Three Gorges facility and the shared Brazil/Paraguay Itaipu dam in the south.