"Why India Must Act Fast on the Brahmaputra: China's Mega Dam Raises New Alarms"

 

India, China, and the High-Stakes Battle Over the Brahmaputra

A new chapter in the Brahmaputra river story has begun, and it's one India cannot afford to ignore. Last week, China kicked off construction on a massive hydropower project on the Yarlung Zangbo — that’s what the Brahmaputra is called before it flows into India through Arunachal Pradesh. Just before the river crosses the border, China is building what could become the world’s largest hydroelectric dam, with a projected capacity of 60 GW — triple the output of the famous Three Gorges Dam.

The $170 billion project is part of Beijing's grand development vision for Tibet, but its implications stretch far beyond Chinese borders. It’s raising serious alarms in India and Bangladesh — the downstream countries — particularly in Arunachal Pradesh, where the river is known as the Siang. Arunachal Chief Minister Pema Khandu didn’t mince words, calling it a “ticking water bomb.” His concern, widely shared across India’s Northeast, stems from the sheer power this dam gives China over the flow of one of South Asia’s most volatile rivers.

One of the major concerns is that once the dam becomes operational, China will have greater control over the river’s volume. This means they could, either deliberately or accidentally, release water in sudden surges — a move that could flood large parts of Assam and Arunachal Pradesh. Worsening climate conditions or engineering errors could further aggravate this risk. The Chinese haven’t revealed details about the dam’s storage capacity either, leaving India with more questions than answers.

India’s situation is unique. Unlike many lower riparian countries that depend heavily on upstream flows, the Brahmaputra swells with volume only after it enters Indian territory, fed by tributaries like the Dibang and Lohit in Arunachal Pradesh. However, even with that geographical advantage, the unpredictability of the river remains a major challenge. Flooding during the monsoon is already a recurring nightmare for Assam. Any additional disruption in flow could spell disaster.

While India and China have a 2013 agreement to share hydrological data, China’s cooperation has often been patchy. This adds to the urgency for India to take proactive steps. One of those steps could be the long-proposed Siang multipurpose dam in Arunachal Pradesh — a project that was floated by Niti Aayog in 2017 as a strategic counter to China’s ambitions. Not only would this dam generate electricity, but its storage capacity could act as a buffer against sudden water releases from upstream.

Unfortunately, progress on the Siang project has been slow. Despite being tasked with preparing a pre-feasibility report, the National Hydro Power Corporation (NHPC) hasn’t yet completed vital groundwork. Local opposition in Arunachal Pradesh has also stalled momentum, with many fearing displacement and ecological damage.

But with China moving ahead at full throttle, the luxury of delay is one India can no longer afford. Strengthening flood defenses, accelerating hydropower development, and building strategic storage facilities in the Northeast must now become top national priorities. The Brahmaputra is not just a river — it’s a lifeline, a geopolitical pressure point, and potentially, a front line in an unfolding water war.