Arunachal Pradesh’s Dam Crisis: Arrests, Resistance and the Ecological Cost of Development

Neha Desai, KalimNews, Itanagar, October 29, 2026: The escalating conflict over the proposed Siang mega-dam exposes a deepening struggle between India’s hydropower ambitions, national security concerns, Indigenous land rights and the future of a fragile Himalayan ecosystem.

Introduction: When a River Becomes a Battleground

The recent dam-related unrest in Arunachal Pradesh has brought a long-simmering conflict into sharp focus. In the Siang Valley, opposition to a proposed mega-dam has grown from local resistance into a wider confrontation involving Indigenous communities, government authorities, security forces and competing visions of development.

The immediate flashpoint is the proposed Siang Upper Multipurpose Project (SUMP), a massive hydropower and water-storage project planned on the Siang River, which flows downstream into Assam as the Brahmaputra. With a proposed generating capacity reported at approximately 11,200 megawatts, the project is intended to strengthen India’s hydropower capacity and address concerns about China’s upstream dam-building plans.

Yet for many residents, particularly members of the Adi Indigenous community, the project represents a threat to ancestral territory, village life, agricultural livelihoods and an ecosystem to which their cultural identity is closely connected.

In October 2026, protests intensified, activists were detained, security forces were deployed in greater numbers, and demonstrations in Pasighat escalated into violence. Reuters reported on October 27 that at least 21 arrests had occurred during the preceding clashes, while subsequent reporting documented further arrests and an expanded security presence. The developments have raised urgent questions about the government's response to dissent and whether a project of such enormous consequence can proceed without meaningful public participation.

The crisis cannot be understood simply as a dispute between development and opposition. It is also a conflict over who gets to make decisions about land, rivers and the future of communities that will bear the greatest consequences.

1. The Arrest of Villagers and the Criminalisation of Dissent

One of the most contentious aspects of the recent unrest has been the arrest and detention of residents and activists opposing the dam.

According to Scroll, four members of the Siang Indigenous Farmers’ Forum (SIFF)—Adum Tayom, Omak Paron, Oson Paron and another activist identified in different reports as Otul or Olut Paron/Paroh—were detained on October 9 under the Arunachal Pradesh Unlawful Activities (Prevention) Act, 2014. Reporting has also documented additional arrests associated with the protests and subsequent violence. The state’s preventive-detention framework has become a major point of contention because of concerns about the duration of detention and the safeguards available to those held.

For affected families, the circumstances surrounding the initial detentions deepened the controversy. Scroll reported that the four activists were taken from a barber shop and that their families were initially unable to establish where they had been taken. Community representatives subsequently demanded their release and questioned the use of preventive detention against people resisting the project.

The authorities, for their part, have cited public-order concerns and the need to prevent unlawful activities. Following the October clashes, police also pursued allegations involving arson, vandalism, stone-pelting and attacks on public and private property. These allegations require proper investigation, and peaceful protest must be distinguished from acts of violence.

Nevertheless, the use of stringent laws against people associated with an environmental and land-rights movement raises an important democratic question: are exceptional security measures being applied in a manner proportionate to the actual conduct of those detained?

When villagers fear that attending a protest, opposing a survey or organising a community meeting could expose them to arrest, the consequences extend beyond individual cases. Such measures can discourage public participation, fracture community organisations and make it harder for residents to communicate their concerns through peaceful channels.

A credible response must therefore include transparent disclosure of the grounds for detention, access to legal counsel, judicial scrutiny and accountability for any unlawful treatment in custody. Arrests connected to alleged violence should be investigated on the evidence, rather than used to cast an entire anti-dam movement as criminal.

The legitimacy of a major infrastructure project cannot be established through the suppression of those who question it.

2. Coercive Crackdowns and the Militarisation of the Siang Valley

The arrests have unfolded alongside a broader security response that residents and civil-society organisations describe as coercive.

A report published by Mongabay-India on October 5, 2026, documented police summons, restrictions affecting activists and media pages, and allegations that protesters had been subjected to a lathi charge by police and paramilitary personnel in Uggeng village on October 4. It also reported that authorities had issued summons to members of the SIFF youth wing in connection with protests.

By mid-October, the Upper Siang district administration had imposed restrictions on public assembly. Following the violent clashes in Pasighat on October 23, the authorities expanded the security deployment. Reuters reported on October 27 that hundreds of additional personnel had been sent to the region.

Residents have described the presence of security personnel in affected villages as an attempt to create a climate of intimidation while surveys for the proposed project continue. Such accounts should be assessed alongside official explanations that the deployment is intended to prevent further violence and protect people and property.

The distinction between maintaining public order and suppressing legitimate dissent is crucial. Governments have a responsibility to respond to arson, assaults and other criminal acts. But peaceful demonstrations, community consultations and opposition to land acquisition are not equivalent to violence.

Restrictions on assembly, excessive force and prolonged preventive detention can deepen mistrust, particularly where communities already believe that decisions about their land are being made without their consent.

There is also a practical danger in treating resistance primarily as a security problem. A dam project requires geological investigations, environmental assessments, negotiations over land and rehabilitation, and sustained cooperation with affected populations. If these processes become associated with police action and intimidation, the government risks undermining the very public trust needed to implement the project responsibly.

Security measures may contain an immediate disturbance. They cannot resolve the underlying dispute over the river.

3. Widespread Public Opposition: More Than a Dispute Over Electricity

Opposition to the Siang project is rooted in fears of displacement, loss of agricultural land, disruption of community life and the destruction of a river landscape that has sustained Indigenous populations for generations.

According to Reuters and The Indian Express, community representatives estimate that 27 villages could be completely submerged, with another 40 to 50 villages potentially affected. These figures reflect estimates reported by opponents of the project; the precise extent of the impact will depend on the final design and assessment of the proposed reservoir.

For affected residents, the threat is not limited to losing houses. Land provides food, livelihoods, access to forests and rivers, and a physical connection to ancestors. Community institutions, customary practices and sacred places are also tied to particular landscapes.

This helps explain why the movement has persisted despite official appeals to support preliminary surveys. The government maintains that the current pre-feasibility exercise is intended to determine whether the project is technically viable, and that detailed environmental and social assessments would follow if it advances. Residents, however, fear that drilling and other preparatory work will create momentum towards construction before their objections are adequately addressed. The distinction between technical feasibility and social legitimacy is important. A project may be technically possible without being acceptable to the people whose homes and livelihoods would be affected.

The scale of public opposition is also evident in the participation of community organisations, youth groups and Indigenous associations, including the Siang Indigenous Farmers’ Forum, the Adi Bane Kebang United and the SUMP Affected Area Youth Association. Their demands have included the suspension of survey activities, the release of detained activists and the withdrawal of additional security forces.

In the wider context, protests have also emerged against other proposed hydropower developments in Arunachal Pradesh. The pattern suggests that concerns about dams extend beyond a single project to broader questions about the cumulative effects of hydropower development, the distribution of its benefits and the protection of customary land rights. Public opposition should not automatically be interpreted as hostility to electricity generation or economic development. It can instead reflect a disagreement over who defines development, who benefits from it and who bears its costs.

4. Ecological Destruction and the Vulnerability of the Himalayan Landscape

The environmental implications of a mega-dam in Arunachal Pradesh are central to the controversy. The Eastern Himalayas contain exceptionally rich biodiversity, steep mountain catchments and river systems shaped by intense rainfall, erosion and complex geological processes. Large infrastructure projects in such landscapes require careful evaluation of risks that cannot be captured by electricity-generation figures alone.

Submergence of forests, farmland and habitats

A large reservoir can inundate forested slopes, agricultural plots, settlements and riverine habitats. Even areas outside the reservoir may experience changes from roads, construction camps, transmission infrastructure, excavation and the movement of heavy machinery.

For communities living along the Siang, the consequences could include reduced access to forest resources, loss of productive land and disruption of the natural environments on which local livelihoods depend.

The full extent of these impacts cannot be established without project-specific environmental and social assessments. Nevertheless, the potential scale of submergence makes a detailed baseline study of habitats, wildlife, forests and community land use essential before any construction decision.

Changes to river ecology

Dams alter the natural movement of water and sediment. Reservoirs can trap sediment that would otherwise replenish downstream riverbanks and floodplains, while changes to the timing and volume of water releases can affect fish habitats, aquatic organisms and river-dependent livelihoods.

A large storage project can also change water temperature and dissolved-oxygen conditions. Depending on its design and operating regime, it may disrupt fish migration and other ecological processes.

The Siang is not an isolated watercourse. It forms a major part of the Brahmaputra river system, connecting upland ecosystems with communities and habitats downstream in Assam. The potential consequences therefore warrant assessment across the river basin, rather than only within the proposed construction area.

Earthquakes, landslides and reservoir-related risks

Arunachal Pradesh lies in a seismically active part of the Himalayas. Building a major dam and reservoir in this setting requires rigorous assessment of earthquake hazards, slope stability, landslides, sediment accumulation and the possibility of extreme floods.

Reservoir-induced seismicity is a recognised phenomenon in which changes in water loading and pressure can influence existing geological stresses in certain conditions. This does not mean that every large reservoir will trigger a damaging earthquake, but the possibility must be evaluated using reliable geological and seismic data.

The combination of steep terrain, unstable slopes, intense rainfall and seismic activity also complicates construction and long-term reservoir management. The potential consequences of structural failure or an uncontrolled release of water make independent safety reviews and credible emergency plans indispensable.

Cumulative environmental damage

A further concern is the cumulative impact of multiple hydropower projects, associated roads and transmission lines across the region. Assessing each project in isolation can overlook the combined effects of forest fragmentation, habitat disruption, altered river flows and increased pressure on vulnerable slopes.

The central question is therefore not simply whether one dam can be engineered safely. It is whether the project, considered alongside other existing and proposed developments, can proceed without unacceptable damage to the river basin and the communities dependent on it.

The environmental concerns raised by Indigenous organisations are significant, but their exact magnitude must be established through transparent, independent scientific assessment rather than assumptions made either for or against the project.

5. The China Factor: National Security Versus Local Security

The Indian government's case for the Siang Upper Multipurpose Project is closely linked to China's proposed hydropower development on the Yarlung Tsangpo in Tibet, the river that enters India as the Siang.

China's plans have prompted concerns in India about future changes to transboundary water flows, the availability of water during different seasons and the strategic implications of upstream infrastructure. New Delhi presents the proposed Indian project as a way to strengthen hydropower generation, improve water-storage capacity and potentially help manage downstream flood risks.

These concerns form a genuine part of the geopolitical context. However, the precise effects of China's proposed infrastructure on downstream water availability and flood risk remain dependent on technical, operational and hydrological factors. Claims about deliberate water releases or the extent to which an Indian reservoir could mitigate such risks should be subjected to careful scrutiny.

The strategic argument also raises a difficult question: can a project intended to protect national interests create new vulnerabilities for the people living closest to it?

For residents of the Siang Valley, national security is not an abstract concept. It includes the security of homes, farms, food supplies, cultural institutions and the river on which everyday life depends. A policy that seeks to protect downstream populations from potential water-related threats must also account for the risks imposed on communities living upstream.

The government’s strategic objectives and residents’ concerns need not be mutually exclusive. But reconciling them requires transparent technical evidence, meaningful participation and a credible explanation of why this particular project is necessary, what alternatives exist and how the risks would be distributed.

National security cannot be a substitute for public consultation. Nor should local concerns be dismissed merely because the project has strategic importance.

6. Violence and the Breakdown of Trust

The October protests also demonstrate how quickly a prolonged policy dispute can escalate when communication between authorities and affected communities breaks down.

On October 23, demonstrations against the project were followed by clashes in the Siang region and Pasighat. Police used tear gas, while authorities reported stone-pelting and attacks on security personnel. Public reporting subsequently documented arson and vandalism involving a police station, a National Hydroelectric Power Corporation office and private property, including the homes of political figures. The incidents resulted in arrests and a further security buildup. Such attacks cannot be justified as a necessary or acceptable form of environmental protest. They endanger people, damage public infrastructure and risk undermining the credibility of a movement whose stated concerns include land, livelihoods and Indigenous rights.

At the same time, the occurrence of violence does not erase the grievances that preceded it. The reasons for the escalation—including the conduct of security forces, the treatment of protesters and the circumstances surrounding individual acts of violence—require evidence-based investigation.

It is important to distinguish between peaceful demonstrators, organisers advocating non-violent resistance and individuals accused of specific criminal acts. Collective punishment or the indiscriminate criminalisation of a movement can intensify resentment without resolving the underlying dispute.

The state faces the responsibility of protecting public safety while preserving the space for peaceful dissent. Community organisations, in turn, have an interest in maintaining non-violent discipline and ensuring that their demands are not overshadowed by attacks on people or property.

Rebuilding trust will require more than appeals for calm. It will require visible accountability, credible dialogue and a process in which residents can challenge official decisions without fear of retaliation.

7. What a Responsible Way Forward Could Look Like

Resolving the crisis requires addressing both the immediate unrest and the deeper questions about environmental governance and Indigenous rights.

First, protect the right to peaceful protest. Authorities should ensure that detention is lawful, that allegations of misconduct are independently examined and that protesters have access to legal remedies. Any restrictions on public assembly should be proportionate and subject to appropriate review.

Second, make public consultation meaningful. Affected communities should receive accessible information about the proposed dam, the planned reservoir, likely submergence, alternatives and the possible consequences for land and livelihoods. Consultation should begin before irreversible decisions are made and should allow residents to question project proponents directly.

Third, commission rigorous environmental and seismic assessments. Studies should examine biodiversity, river flows, sediment transport, geological hazards, landslides, reservoir safety and cumulative impacts across the basin. The underlying data, methodologies and findings should be made available for independent scrutiny.

Fourth, recognise Indigenous land and cultural rights. Compensation alone may not replace ancestral territory, customary access to forests or sacred places. Any assessment of rehabilitation must consider cultural continuity, livelihood security and the long-term viability of relocated communities, not merely the market value of lost property.

Fifth, examine alternatives. The government should explain the expected benefits of the proposed project in relation to its costs and risks, including whether alternative combinations of energy sources, smaller projects, efficiency improvements and other water-management measures could meet some of the same objectives.

Finally, establish an independent dialogue process. Representatives of affected villages, Indigenous organisations, environmental experts, government agencies and project authorities should have a credible forum for examining evidence and resolving disagreements. Such a process should not presume that construction must proceed, nor that every technical assessment must be abandoned. Its purpose should be to make the decision transparent, accountable and informed by those most affected.

Conclusion: Development Without Displacement?

The dam-related crisis in Arunachal Pradesh is a warning about what happens when infrastructure ambitions advance faster than public trust.

The proposed Siang Upper Multipurpose Project sits at the intersection of India's energy needs, strategic competition with China, the rights of Indigenous communities and the ecological vulnerability of the Himalayas. Each of these issues matters, and none can responsibly be ignored.

The arrest of villagers and activists, the reported use of force against protesters and the expansion of security deployments have intensified concerns that resistance is being treated primarily as a law-and-order problem. Meanwhile, the violence and property destruction reported during the protests underline the urgent need to protect public safety and preserve non-violent channels for disagreement.

Beneath these immediate incidents lies a more fundamental conflict over who has the authority to determine the future of the Siang Valley. For residents, the river is not merely a source of electricity or a strategic resource. It is also a foundation of livelihoods, collective memory and cultural identity.

The government has a legitimate responsibility to consider national energy and water-security needs. It also has a responsibility to demonstrate that the pursuit of those goals will not come at an unjustifiable cost to vulnerable communities or the environment.

A durable resolution will depend on whether authorities can replace coercion and mistrust with transparent assessment, genuine participation and accountability. Development cannot be measured by generating capacity alone. It must also be judged by the security of the people affected, the protection of ecosystems and the fairness of the decisions that shape their future.

The central question facing Arunachal Pradesh is therefore not simply whether the Siang River should be dammed. It is whether a decision of such profound consequence can be reached through a process that respects both the public interest and the rights of the people who call the valley home.

Neha Desai, graduated from Jawaharlal Nehru University, based in Arunachal Pradesh. She is an independent writer dedicated to social research, focuses primarily on issues concerning society, religion, ethnicity, and women etc. Has published numerous articles and reports on dams.