Siang Dam: What is behind protest in Arunachal Pradesh against the 11,200 MW hydroelectric project? All you need to know

The Siang Upper Multipurpose Project, or SUMP, is a proposed 11,200 MW project on the Siang River in Arunachal Pradesh. It is still at the pre-feasibility stage, meaning officials are studying whether it could work. The project matters because it could reshape the Siang region and affect communities living there.

Sections of the Adi community oppose the survey and report work. Local groups, including the Siang Indigenous Farmers Forum and youth organisations, want the process stopped immediately. They fear families could be displaced, traditional livelihoods could be disrupted, ecosystems damaged and a mega project built in a seismically active area.

Peaceful protests had continued before violence erupted during a 12-hour bandh on October 23. Police said at least 40 security personnel were injured, while protesters allegedly torched public buildings and vehicles. The government says consultations and assessments will come before any final construction decision.

The proposed Siang Upper Multipurpose Project is planned with a capacity of 11,200 megawatts. Capacity measures the maximum electricity the project could generate at a given time under suitable conditions. The figure shows that SUMP is intended as a very large national-scale infrastructure project, not a small local power station.

Compared with ordinary power projects, an 11,200 MW facility would be exceptionally large. Many individual power plants generate hundreds or a few thousand megawatts, so SUMP would stand at the extreme upper end of project size. Its actual output would still depend on river flows, design and operating conditions.

The scale explains both sides of the dispute. The government links it to jobs, economic growth and energy security. Opponents fear that a project this large could cause displacement, ecological damage and serious disruption in the Siang Valley, especially in an earthquake-prone region.

Opposition comes mainly from sections of the Adi community in the Siang Valley. Prominent groups include the Siang Indigenous Farmers Forum, its youth wing, the SUMP Affected Area Youth Association, Adi Bane Kebang United and the Adi Galo Welfare Society. They have demanded an immediate halt to the pre-feasibility activities and survey work.

Their concerns cover both people and place. They fear affected families could be displaced and traditional ways of life disrupted. Farmers and other residents also worry about impacts on livelihoods. The groups have raised ecological concerns and risks linked to building a mega project in a seismically active region.

The opposition began as peaceful protest but turned violent during a 12-hour bandh. Police reported injuries and damage to public and private property. The government says the project could create jobs and growth, while promising consultations and assessments before any final construction decision.

A pre-feasibility report is an early examination of whether a proposed project appears technically, environmentally and economically viable. It helps authorities understand the project’s possible design, challenges and effects before making a final decision. For SUMP, the report concerns the proposed 11,200 MW project on the Siang River.

The government says survey teams are collecting information for this initial exercise. It argues that the work only assesses viability and does not amount to final approval for construction. In practical terms, studying a project is different from authorising it to be built.

Officials have also said public consultations and assessments would be required before any final decision. Protesters nevertheless want the report work stopped immediately, saying affected families’ concerns must be addressed first. Chief Minister Pema Khandu has invited youth groups for discussions and said he will remain engaged until the PFR process is completed.

If the project is built, the government says it could drive economic and social growth, create employment for young people and strengthen water and energy security. It could also become strategically important because China has proposed a mega dam upstream on the Siang River. The project would therefore affect both local development and wider national concerns.

The costs could be substantial. Opponents fear displacement, damage to ecosystems and disruption to traditional ways of life. They also worry about the risks of constructing a mega project in a seismically active region. These concerns remain unresolved while the pre-feasibility report and survey work continue.

If protests and clashes continue, more people could be injured and more public, private and government property damaged. The Friday violence already involved alleged attacks on a police station, an NHPC office, vehicles and residences. The government is pursuing talks, while protests could intensify if local concerns are not addressed.

The government presents SUMP as more than a power project. It says the proposed 11,200 MW facility could support economic and social growth, generate employment for Arunachal Pradesh’s youth and strengthen water and energy security. These benefits are especially important to officials because the project sits on the Siang River, a major regional resource.

The government also connects SUMP to China’s proposed mega dam upstream on the river. The article does not detail the Chinese project’s design, but officials cite it as part of the broader water and energy-security concern. This gives the Indian project a strategic dimension alongside its development goals.

Officials stress that the current pre-feasibility exercise is not construction approval. They say viability must be assessed first, followed by public consultations and other assessments. Meanwhile, opposition groups want surveys stopped, and Chief Minister Pema Khandu has invited youth representatives for discussions.

In general, a hydroelectric dam stores or channels river water through turbines. The moving water spins the turbines, and generators convert that motion into electricity. A project’s capacity, such as SUMP’s proposed 11,200 MW, indicates how much electricity its equipment could produce at maximum output. Actual generation depends on water flow and operating conditions.

A very large dam can provide substantial electricity and may support wider water management. It can also bring construction activity, jobs and regional development. These potential benefits help explain why the government describes SUMP as important for economic growth, employment and water and energy security.

The risks are also significant. Building in a seismically active region means earthquakes must be considered in design, construction and operation. A major project can affect ecosystems, communities and traditional livelihoods over a wide area. In the Siang Valley, opponents specifically fear displacement, ecological damage and seismic danger, while the government says assessments and consultations are still required.