An igapó, a flood-prone wooded area on the Vuelta Grande of the Xingu River, with fruit on the dry ground. This is where the piracema, or fish reproduction, was supposed to take place, frustrated by the scarcity of water released by the Belo Monte hydroelectric plant on this stretch of the river in the eastern Brazilian Amazon. The fruits are lost and stop feeding the fish by falling on the ground and not in the water. Credit: Mati / VGX

By Mario Osava
BELÉM, Brazil, Jul 28 2024 (IPS)

The decade-and-a-half-long battle for life in the so-called Volta Grande (Big Bend) of the Xingu river, a stretch of the river dewatered by the Belo Monte hydroelectric power plant in the Brazilian Amazon, has a possible solution, albeit a partial one.

The mega power project divided the waters of the Xingu. It has taken up most of the river and emptied the now 130-kilometre U-shaped Reduced Flow Stretch (TVR, in Portuguese), whose banks are home to two indigenous groups and a community, all affected by the depletion of fish, the basis of their livelihood.“We have become illiterate about the river, and the fish. We no longer know how to read what is happening in the river”: river dweller.

A proposal drawn up by these villagers and scientific researchers makes it possible to recover the minimum conditions for the reproduction of fish, which have declined since the plant began operations in 2016. The goal is to mitigate the project’s negative impacts on the people living in the area.

But Norte Energía, the concessionaire of Belo Monte, estimates that this alternative would cost it a 39% reduction in its electricity generation. The dilemma pits the vital needs of the riverside population against the company’s economic feasibility.

Belo Monte, 700 kilometres southwest of Belém, is one of major power and logistics projects that abounded in Latin America in the first two decades of this century. It is the third largest hydroelectric plant in the world, with a capacity of 11,233 megawatts and an expected effective generation of only 40% on average.

Josiel Juruna, speaking at a July meeting of the Brazilian Society for the Advancement of Science, in the city of Belém, in the Brazilian Amazon. Credit: Mario Osava / IPS

The Xingu river in the eastern Amazon region attracted energy interest because of its average flow of 7,966 cubic metres per second and the gradient that allowed Belo Monte to have its main power plant with a water fall of 87 metres.

But its flow has excessive variations, with floods 20 times higher than its low water level. With less than 1,000 cubic metres per second in low water, it lowers the plant’s average annual generation.

To prevent the flooding of the Volta Grande of the Xingu (VGX) and, within it, of the two indigenous lands of the Juruna and Arara peoples, a canal was built to connect the two points of the curve, diverting about 70% of the river’s waters and draining the life out of the curved section.

A sarobal, an island of stones and sand, prone to flooding in the Vuelta Grande of Xingu, in Brazil’s eastern Amazon. It used to be a fish breeding site, but lost that function due to the water shortage caused by the Belo Monte hydroelectric plant, which diverted 70% of the river’s water into a channel used for power generation. Credit: Mati / VGX

The power plant and the ecosystem’s disruption

In addition to taking away water, the project disrupted the environment, especially water cycles, and thus human, animal and plant life. “We have become illiterate about the river, and the fish. We no longer know how to read what is happening in the river,” said a river dweller at a hearing organised by the Public Prosecutor’s Office in August 2022.

Piracema, the upstream migration of shoals of fish during spawning, is vital to sustain livelihoods in the VGX, stresses Josiel Juruna, local coordinator of the Independent Territorial Environmental Monitoring (Mati).

Belo Monte deteriorated the quality of life of river dwellers by making piracema unviable.

That is why Mati, led by some 30 university scientists and local researchers, prioritised the monitoring and recovery of the piracema, understood as a site for procreation, apart from monitoring and measuring other ecological aspects in the stretch most affected by the hydroelectric plant.

An Independent Environmental and Territorial Monitoring team observes critical points in the low-flow section of the Xingu river, whose waters have been diverted to the canal that feeds the Belo Monte hydroelectric plant in the Brazilian Amazon. Credit: Courtesy of Juarez Pezzuti

As a result of their participatory research, launched in 2014 by the Juruna people and the non-governmental Instituto Socioambiental, in 2022 Mati presented to environmental authorities the Piracema Hydrograph, which indicates the flow necessary for the reproduction of fish in the VGX.

This is an alternative to hydrographs A and B, which govern the flow of water that Belo Monte releases to the VGX, in defined quantities for each month, to meet the conditions agreed for the operation of the hydroelectric plant. They are also called Consensus hydrographs, applied according to different pluviometric conditions.

These flows were defined in the environmental impact studies carried out by specialised companies, but paid for by Norte Energía, to obtain the license for the construction and operation of the plant.

A sample of the hydrographs that should govern the amount of water destined each month to the Vuelta Grande of the Xingu river to sustain its ecological functions. In purple and with flow figures for each month, the hydrograph proposed by indigenous people, riverside dwellers and scientific researchers to recover the lower and more productive piracemas. Credit: Mati / VGX

Piracema, key to river life

Indigenous people have always disagreed with these hydrographs because they do not ensure the necessary flow for maintaining the ecosystem, which is indispensable for the fish, the basis of their diet and the income they obtain from the sale of surplus fish.

It releases insufficient water at inappropriate times, ignoring the dynamics of the piracema, according to Juruna.

“The Belo Monte hydrograph only allows flooding in April, but the piracema requires lots of water between January and March, so that it fills the sarobal and igapós, where the female fish arrive to spawn and then the males for fertilisation,” he told IPS in Belém.

The word sarobal in Brazil defines an island of stone and sand, flooded and with vegetation of grasses and shrubs that provide food for the fish. Igapó is also a flooded area of banks and small waterways, with trees and vegetation that produce fruit and other foodstuffs.

Without water, the fish do not have access to their breeding grounds or to the fruits, which fall on the dry ground. Juruna often shows a video of a curimatá, a fish abundant in the Xingu, with dried eggs in its belly. It “couldn’t spawn” because there was no water in the piracema at the right time, he explained.

Apart from more water, the Piracema Hydrograph requires bringing forward the release of more water for the Vuelta Grande by at least three months. And maintaining the flood for a few months is also indispensable to feed the fish with the fruits falling in the water and not on the ground.

In fact, it is necessary to increase the flow of the VGX with ‘new water’ from November onwards, so that the fish start to migrate. “Without the right amount of water at the right time, there is no piracema”, the basis of river life, stresses a Mati report.

Fish killed by a fall in water flow in the Xingu river’s Vuelta Grande. Credit: Mati / VGX

Irrecoverable way of life

The Piracema Hydrograph will not restore the former way of life in the Vuelta Grande. That would require restoring past conditions, without the hydroelectric plant, admitted Juruna. His goal is to rehabilitate “the lower piracemas”, i.e. the sarobals and the floodable igapós with a little more water than what Belo Monte releases.

“The higher piracemas will no longer exist,” he lamented.

There will be no fish as before, the Juruna have already become farmers and mainly cultivate cocoa. A recovery of the piracemas will allow them to fish for their own food, but hardly for sale and income, he said.

Community life has declined among the indigenous people, who increasingly feed themselves on ‘city products’ and move more and more to Altamira, a city 50 kilometres away from the indigenous land of Paquiçamba, where the Jurunas live.

With Belo Monte, a road to the city was built and motorbikes have multiplied in the indigenous village, Juruna observed. Their way of life has been profoundly altered, but the indigenous people are resisting the death of their river and the Mati have added their traditional knowledge to scientific research.

Biologist Juarez Pezzuti, a professor at the Federal University of Pará, based in Belém, and a member of Mati, believes it necessary to dispel the idea of Belo Monte and other hydroelectric plants, especially those in the Amazon, as sources of sustainable energy.

“They emit greenhouse gases in a similar proportion to fossil-fuel thermoelectric plants,” he told IPS. In addition to flooding vegetation when the reservoir is formed, they continue to do so afterwards, because as their waters recede, the vegetation that will later be flooded is renewed.

Their downstream impacts are only now beginning to be studied. In the Amazon, they dry up the igapós, as has already been seen in the Balbina power plant near Manaus, capital of the neighbouring state of Amazonas.

It is a technology in decline, whose social, environmental and climatic costs tend to be better recognised and call into question its benefits, he concluded.