Belo Monte Dam: Electricity or life in Brazil’s Amazon rainforest

by MARIO OSAVA

The main plant of the Belo Monte hydroelectric power plant has a capacity of 11,000 megawatts, to which 233 more megawatts are added from the secondary plant. The complex cost twice the initial budget, equivalent to more than 10 billion dollars when it was built. It also faces difficulties such as the delay in the construction of the transmission line that will carry energy to the southeast of Brazil, inefficiency in generation and higher than expected social and environmental costs. PHOTO/ Marcos Corrêa/PR-Agência Brasil

“We are no longer familiar with the Xingú River,” whose waters govern “our way of life, our income, our food and our navigation,” lamented Bel Juruna, a young indigenous leader from Brazil´s Amazon rainforest.

“The water is no longer at its normal, natural level, it is controlled by the floodgates,” she explained. The giant floodgates are managed by Norte Energia, a public-private consortium that owns the Belo Monte hydroelectric plant whose interest is using the river flow for profit.

Built between the middle and lower sections of the Xingú River, in the eastern Amazon, Belo Monte takes advantage of a 130-kilometre U-shaped curve in the river, called the Volta Grande.

A 20-km artificial channel diverts most of the flow, in a shortcut that connects to the end of the curve, at an 87-metre waterfall. The shortcut kept the Volta Grande – where there are 25 communities, including two legally protected indigenous territories – from flooding.

The new project replaced the initial idea dating to the 1970s – which would have created a conventional 1,225-square-kilometre reservoir that would have submerged the entire Volta Grande – with two smaller reservoirs totalling 478 square kilometres. The first retains water before the curve and diverts it to the channel that forms the reservoir that feeds the main power plant, which produces 11,000 megawatts of electricity.

The second dam, with a plant that generates up to 233 megawatts, holds the floodgates that release water into the Volta Grande, which almost dried up, bringing other types of impacts for the riverbank population.

The Belo Monte complex, with the third largest power plant in the world, is planned to generate just 4,571 megawatts of firm energy on average.

This low level of productivity, of only 40 percent of installed capacity, is explained by the fact that it is a run-of-river plant whose flow varies from more than 20,000 cubic metres per second in the rainy season – which lasts a few months in the first half of the year – to less than 1,000 metres per second in some of the driest months.

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