
A view shows the Siang river in Siang district, Arunachal Pradesh, India, August 1, 2025. — Reuters
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Perving, India: India fears that a planned Chinese mega -dam in Tibet will reduce the flow of water to a large river by 85 % during the dry season, according to four sources familiar with the matter and a government analysis viewed by Reuters, which will force Delhi to reduce its impact on its impact.
The Indian government has been considering plans since the early 2000s to control the flow of water from Tibet’s Angi Glacier, which maintains more than 100 million people in China, India and Bangladesh. But these projects have been hindered by residents of the border state of Arunachal Pradesh occasionally and occasionally violent resistance, which fears that their villages will be drowned and the path of life will be destroyed by any dam.
Then in December, China announced that it would build the world’s largest hydroelectric dam in the Border County just before crossing the Yalling Zingbo River India. This raised concerns in New Delhi that its long -standing strategic rival – which has some regional claims in Arunachal Pradesh – can surrender its control over the river, which begins in Angi Glacier and is known as Hanni and Brahmapotra in India.
In May, India’s largest hydropower company transferred survey material under armed police near the potential location of the Upper Siang Multipurpose Storage Dam, which would be the country’s largest dam at completion. Senior Indian officials also held meetings this year about accelerating construction, in which the Prime Minister was organized by the office of Prime Minister Narendra Modi in July, according to two sources who spoke on the condition of the government to discuss the issues of sensitive government.
Delhi’s concerns were described in an analysis of the impact of the Chinese Dam, the Indian government’s analysis, details of which were confirmed by Reuters by four sources and is reporting for the first time.
Beijing has not issued detailed plans for the construction of the dam, but has been analyzed by the past work done by the Indian government -affiliated agencies such as the Central Water Commission, and has calculated the expected size of the Chinese project, which broke the ground in July and cost about $ 170 billion.
Delhi estimates that the Chinese Dam will allow Beijing to turn 40 billion cubic meters of water, or according to sources and documents, more than one -third of the annual annual received at a significant border point. Its effect will be especially intense in the months of non -monsoon, when temperatures and lands are barren in parts of India.
The Upper Horn Project will eliminate it with the capacity of 14 BCM storage, which can release water to India in dry weather. This may mean that the major regional cities of Guwahati, which depend on the water -related industry and farming, will see a decrease in the supply of 11 %, according to the sources and document, if the Indian dam is not built, unlike 25 %.
Sources said that the project could also reduce any move to release Beijing’s water flowing turents.
According to the document and sources, if the dam is at its minimum dragon -down level – where the water is stored at less than 50 % of its height – according to the document and sources, it will be able to completely absorb any additional water issued by the violation of Chinese infrastructure. Two sources said that India is considering a proposal to keep its 30 % of the dam vacant at any time to calculate the unexpected increase.
A Chinese Foreign Ministry spokesman said in response to Reuters’ questions that hydropower projects have “done a strict scientific research on safety and environmental protection, and will not negatively affect the geology of water resources, environment, or flowing countries.”
The spokesperson added, “China has always maintained a responsible attitude towards the development and use of international rivers, and has maintained long -term communication and cooperation with countries like India and Bangladesh.”
Modi’s office and Indian ministries did not respond to writers responsible for water and foreign affairs. The official hydropower Major NHPC also did not return the request to comment.
The Indian Foreign Ministry has said that during a meeting with his Chinese counterpart on August 18, senior diplomat Jaishkar raised concerns about the dam. A deputy from Jeskar also told lawmakers in August that the government was pursuing measures to protect the lives and livelihoods of citizens in the areas below, including the construction of the dam.
India itself has been accused by Pakistan, which is a Chinese ally, which in May it briefly clashed with water. Delhi suspended its participation in the water sharing agreement with Islamabad this year in 1960 and is considering turning away from another important river away from its neighbor.
An international tribunal has ruled that India should follow the deal, but Delhi says the panel lacks jurisdiction.
Development or destruction?
When NHPC workers shifted the surveys near Pirong village in May, angry locals damaged their machinery, destroyed a nearby bridge and looted police tents sent to protect the operation.
Many of them are members of the Ardi community of Arunachal, who are far from paddy, orange and sweet lime farms in the hills and valleys raised by the horn.
Villagers have set up temporary watch posts on regional roads to refuse access to NHPC workers. It has forced security personnel to reach a potential location of the dam, often at night.
According to two sources, at least 16 ADI villages are likely to be lost from the storage area of the dam, which directly affects 10,000 people who directly. Community leaders say more than 100,000 people will have an impact.
“On this earth, we help us to educate our children and help our family,” said Odoni Paulo Paban, a mother of two and two, said Odoni Paulo Paban, said Odoni Paulo Paban, a mother of two and two. “We will kill the dam.”
The dam has the support of Arunachal’s Chief Minister, who is a member of Modi’s party and has termed the Chinese project a dangerous threat.
The state government said in a statement that the project would “ensure water safety and provide a moderate flood to counter any possible water increase.”
Legislative potatoes, an ad, represents an area that will be drowned by an Indian plan, he said he believes that locals may be convinced if they get compensation.
Referring to the instructions from Modi’s office, three sources said that the NHPC plans to spend more than $ 3 million on education and emergency infrastructure to encourage the villagers to move elsewhere.
According to the Arunachal government and dozens of locals, in a symbol of development, three villages in the area have recently agreed to perform NHPC officials to perform dams related to the dam.
India has a history of workers’ movements against large dams, which have sometimes slowed down these projects for years or forced them to scale.
Even if the Upper Siang Dam moves forward, according to four sources, it may take a decade to build the land after breaking. This means that after the Chinese project, the project will likely be completed, which is expected to start generating electricity from the early 2030s to mid -2030.
The source said that the delay means that if a Indian plan is at risk during construction, Beijing releases water suddenly during the monsoon season, and stimulates the increase that can wash temporary dams.
International experts and ADI workers have also warned that the construction of large dams in Tibet and Arunachal can increase the risks for communities in Tibet and Arunachal.
The Chinese “Dam is being built in a high earthquake zone and in a zone that causes extreme weather events,” said Sanangshu Modek, a Chinese water relations expert at the University of Arizona.
“Such extreme weather events have mobilized land sliding, clay lesions, the spread of icy lakes,” he said. “So it raises concerns about the safety of the dam … this is a very legitimate concern and India should engage with China.”