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Amazon Watch / Maíra Irigaray
The Belo Monte Dam on the Xingu River: 10 years of impacts in the Amazon and the search for reparations
The Belo Monte Dam has caused an environmental and social disaster in the heart of the Amazon—one of the most important ecosystems on the planet.
This situation has only worsened since the hydroelectric plant began operations in 2016. The quest for justice and reparations by the affected indigenous, fishing, and riverine communities continues to this day.
In 2011, the Inter-American Commission on Human Rights (IACHR) granted them protective measures that, to date, have not been fully implemented by the Brazilian State.
Furthermore, since June of that same year, the IACHR has yet to rule on a complaint against the State regarding its international responsibility in the case.
The IACHR may refer the case to the Inter-American Court of Human Rights, which has the authority to issue a ruling condemning the Brazilian State.
Background
The Belo Monte hydroelectric plant—the fourth largest in the world by installed capacity (11,233 MW)—was built on the Xingu River in Pará, a state in northern Brazil.
It was inaugurated on May 5, 2016, with a single turbine. At that time, 80% of the river’s course was diverted, flooding 516 km² of land—an area larger than the city of Chicago. Of that area, 400 km² was native forest. The dam began operating at full capacity in November 2019.
Belo Monte was built and is operated by the Norte Energia S.A. consortium, which is composed primarily of state-owned companies. It was financed by the Brazilian Development Bank (BNDES), which provided the consortium with 25.4 billion reais (approximately US$10.16 billion), the largest investment in the bank’s history. Therefore, the BNDES is also legally responsible for the socio-environmental impacts associated with the hydroelectric plant.
Decades of harm to the environment and people
Human rights violations and degradation of the Amazon have been occurring since the project’s inception. In March 2011, Norte Energía began construction of the dam without adequate consultation and without the prior, free, and informed consent of the affected communities.
The construction caused the forced displacement of more than 40,000 people, severing social and cultural ties. The resettlement plan in Altamira—a city directly affected by the hydroelectric dam—involved housing units located on the outskirts, lacking adequate public services and decent living conditions for the relocated families, with no special provisions for those from indigenous communities.
Belo Monte's operations have caused a permanent, man-made drought in the Volta Grande (or "Great Bend") of the Xingu River, exacerbated by the historic droughts in the Amazon in 2023 and 2024. As a result, the deaths of millions of fish eggs were documented for four consecutive years (from 2021 to 2024), and for the past three years, there has been no upstream migration of fish to spawn and reproduce. Thus, artisanal fishing, the main source of protein for indigenous peoples and riverside communities, was severely affected: fish dropped from 50% to 30% of total protein consumed, replaced by processed foods. In summary, there was an environmental and humanitarian collapse that resulted in the breakdown of fishing as a traditional way of life, food insecurity, and access to drinking water for thousands of families, impoverishment, and disease.
Furthermore, the construction of the dam increased deforestation and intensified illegal logging and insecurity on indigenous and tribal lands, putting the survival of these communities at risk. Another consequence was the deepening of poverty and social conflicts, as well as the strain on health, education, and public safety systems in Altamira—a city ranked as the most violent in the country in 2017, where human trafficking and sexual violence increased. Violence was also reported against human rights defenders involved in the case.
In 2025, during the 30th UN Climate Change Conference (COP30), held in Brazil, the Federal Public Prosecutor’s Office labeled the damage caused by the Belo Monte dam as ecocide.
The search for justice and reparations
Over the years, the Federal Public Prosecutor’s Office in Pará, the Public Defender’s Office, and civil society organizations have filed dozens of legal actions in Brazilian courts to challenge the project’s various irregularities and its impacts. Most of the claims are still pending resolution, some for more than 10 years.
These efforts have failed because the national government has repeatedly overturned rulings in favor of the affected communities by invoking a mechanism that allowed a court president to suspend a judicial decision based solely on generic arguments such as "the national interest" or "economic order."
In the absence of effective responses at the national level, AIDA, together with a coalition of partner organizations, brought the case before the Inter-American Commission on Human Rights (IACHR) and, in 2010, requested precautionary measures to protect the lives, safety, and health of the affected indigenous communities.
On April 1, 2011, the IACHR granted these measures and requested that the Brazilian government suspend environmental permits and any construction work until the conditions related to prior consultation and the protection of the health and safety of the communities are met.
And on June 16, 2011 —together with the Xingu Vivo Para Sempre Movement, the Coordinating Committee of Indigenous Organizations of the Brazilian Amazon, the Diocese of Altamira, the Indigenous Missionary Council, the Pará Society for the Defense of Human Rights and Global Justice— we filed a formal complaint against the Brazilian State for its international responsibility in the violation of the human rights of the people affected in the case. The case was opened for processing in December 2015.
On August 3, 2011, the IACHR amended the precautionary measures to request, instead of the suspension of permits and construction, the protection of people living in voluntary isolation, the health of indigenous communities, and the regularization and protection of ancestral lands.
Current situation
The protective measures granted by the IACHR remain in effect, but the Brazilian government has not fully complied with them, reporting only on general actions. The communities have documented the ongoing violations of their rights. The situation that prompted the request for these measures—the risk to the lives, physical integrity, and ways of life of the communities—persists and has worsened with the hydroelectric plant operating at full capacity and the recent extreme droughts in the Amazon.
In addition to the impacts of Belo Monte, there is a risk of further social and environmental impacts from the implementation of another mining megaproject in the Volta Grande do Xingu. There, the Canadian company Belo Sun plans to build Brazil’s largest open-pit gold mine.
The combined and cumulative impacts of the dam and the mine were not assessed. The government excluded Indigenous peoples, riverine and peasant communities from the project’s environmental permitting process. Despite protests by Indigenous communities and other irregularities surrounding the project, the government of Pará formally authorized the mine in April 2026.
Like other hydroelectric dams, Belo Monte exacerbates the climate emergency by generating greenhouse gas emissions in its reservoir. And it is inefficient amid the longer, more intense droughts caused by the crisis, as it loses its ability to generate power.
The case before the Inter-American Commission
In October 2017, the IACHR announced that it would rule jointly on the admissibility (whether the case meets the requirements for admission) and the merits (whether a human rights violation actually occurred) of the international complaint against the Brazilian State.
Fifteen years after the complaint was filed, the affected communities and the organizations representing them are still awaiting this decision. If the IACHR concludes that human rights violations occurred and issues recommendations that the Brazilian State fails to comply with, it may refer the case to the Inter-American Court of Human Rights, whose rulings are binding.
A potential ruling by the international court in this case would set a regional legal precedent regarding the rights of indigenous and riverine peoples, public participation in megaprojects, and state responsibility in the context of the climate crisis—a precedent that is particularly relevant in light of the Court’s Advisory Opinion No. 32, which reaffirmed the obligations of States to protect the people and communities of the continent from the climate emergency.
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Photo Essay: Life in the shadow of Belo Monte
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Their basic human rights have been violated time and time again. The operating company’s attempts at compensation would be laughable, if they weren’t so heartbreaking. The photos that follow depict people and communities who are living amid the volatile realities of this once peaceful patch of rainforest. They are victims of the corruption, violence and abuse that have come to envelop the largest engineering project in Brazil’s history. The Xingu River is dying. Arapujá Island, visible from Altamira, has been completely stripped of life, causing radical change in river currents. Smaller islands where fishermen lived surrounded by fruit trees have been submerged by rising water levels, as the dam’s reservoirs are filled. On one day in January, the Belo Monte dam opened its floodgates without warning; the river is said to have risen more than 20 feet in an hour. Massive amounts of fish have been dying off; locals say Norte Energía even has cleanup crews that bury them, to hide the scale of the daily devastation. Downstream from the dam, the flow of the river at the Big Bend is reducing drastically; the water is becoming muddy and deoxygenated. Communities near and far—from indigenous people to riverine fishermen—are suffering the impacts, as their lives are torn from the river they know so well. As the Xingu dies, they too lose their lives—for the river itself has long been their home, their source of food and livelihood. The construction of Belo Monte has had severe impacts on the natural world, which has long been the primary food source for jungle communities. Tribes who have lived a subsistence lifestyle are finding the river and the jungle they rely on aren’t producing enough, or are too contaminated, to feed their families. Indigenous people have been driven into the nearest city, Altamira, to meet their basic needs. Some go to buy food or go to the doctor; others have succumbed to the struggle and left their village entirely. Many who come to Altamira stay at Casa Do Indio, a house built as a shelter for the recent influx of indigenous peoples. There, they stay in overcrowded rooms, lacking proper sanitation and endangering their health. Far from their homes, stripped of their dignity, they are confronted with the harsh realities of a violent and overcrowded city. As the city closest to Belo Monte, Altamira has undergone drastic changes due to the dam’s construction. Since the project began, the city’s population has grown by nearly 75 percent; 170,000 people are currently living in a city designed for far fewer. Violence has skyrocketed and entire neighborhoods have been destroyed, displacing residents and demolishing longtime family homes. Even neighborhoods Norte Energía claimed would be unaffected by the dam are experiencing its impacts. 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They are made of cement and have thick roofs that trap the jungle heat inside each little box. They are a far cry from the wooden, open, thatch-roofed homes traditional to the Arara’s culture and community. Instead of providing the Arara people with a functioning well to provide clean water, Norte Energía has given the community houses they don’t know how to live in; houses that, each and every day, would pull them further away from where they’ve always been. When we talk to members of the indigenous and riverine communities surrounding Belo Monte, we listen to the same answers to many of our questions. The dam is disrupting their way of life. It’s cutting them off from the natural world around them. It’s threatening their culture, their traditional knowledge and the very structure of their communities. Leoncio Arara, a traditional healer from the Arara da Volta Grande, says he now lives in fear. 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Socorro and her family all had to haggle with the company, as if their basic human rights were negotiable. Some received very little money in compensation, others the option of a prefabricated house in a neighborhood far from the river. Socorro’s parents live in one of those neighborhoods. Behind their new cement house, they built a small home with the wood they were able to save from their destroyed home. It is there that they really live, by the light of small kerosene lamps, sleeping in hammocks. Electricity is not part of their lives. Residents of Altamira live surrounded by the ironies of the third largest dam in the world. On February 28, Altamira and various cities in the state of Para were left without electricity. The cutoff, described by the receptionist at our hotel as routine, was due to testing on one of the dam’s turbines. There’s not much time now until the Belo Monte begins operation. 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