China to proceed with Brahmaputra mega dam despite new concerns

China's decision to proceed with the mega dam on the Yarlung Tsangpo River — the upper reaches of the Brahmaputra in Tibet — marks a significant escalation in transboundary water politics in South Asia. Dubbed the 'project of the century' by Beijing, the dam has been formally included in China's 15th Five-Year Plan (2026–2030) for renewable energy, signaling long-term state commitment. The proposed site near the Great Bend in Medog County, Tibet Autonomous Region, is geologically active and strategically sensitive, located just north of Arunachal Pradesh, which China claims as 'South Tibet'. This project is not merely an infrastructure initiative; it is a strategic lever in China's hydro-hegemony over Asia's major rivers originating in the Tibetan Plateau — often called the 'Water Tower of Asia'. Historically, India and China have no formal water-sharing treaty on the Brahmaputra, unlike the Indus Waters Treaty (1960) with Pakistan. The only institutional mechanisms are the Expert Level Mechanism (ELM) established in 2006 and two Memoranda of Understanding (2013, 2018) for sharing hydrological data during the flood season (May–October). However, data sharing was suspended by China during the 2017 Doklam standoff and again in 2020 amid Ladakh tensions, undermining trust. The absence of a legally binding framework leaves India vulnerable to unilateral upstream actions. The stakes for India are immense. The Brahmaputra contributes nearly 30% of India's freshwater resources and 40% of its total hydropower potential. It sustains agriculture, fisheries, and livelihoods in Assam and Arunachal Pradesh, while its floodplains support unique ecosystems like Kaziranga National Park. Any alteration in sediment flow, seasonal discharge, or sudden water releases could devastate downstream communities. The October 2024 flash floods along the Nepal-China border — triggered by a glacial lake outburst in Tibet — served as a grim reminder of the fragility of the Himalayan hydrological system and the risks of opaque upstream infrastructure. Constitutionally, water is a State subject under Entry 17 of the State List (List II), but inter-state and international rivers fall under Union jurisdiction via Entry 56 of the Union List (List I), read with Article 262, which empowers Parliament to adjudicate inter-state water disputes. While Article 262 does not directly apply to international rivers, it underscores the Centre's responsibility in managing transboundary waters. The Centre's role is further reinforced by Article 253, enabling Parliament to implement international treaties — a pathway India could pursue for a Brahmaputra treaty. Strategically, the dam raises concerns of 'water weaponization' — the ability to withhold water during dry seasons or release excess during monsoons, exacerbating floods. This aligns with broader Chinese assertiveness in the Himalayas, including border infrastructure, village construction in disputed areas, and the 2023 'standardised map' claiming Arunachal Pradesh. The project also intersects with India's own hydropower ambitions in Arunachal (e.g., the 2,880 MW Dibang project), creating a potential 'dam race' in a seismically active zone (Zone V). Broader themes include climate change vulnerability in the Himalayas, the securitization of water resources, and the need for a rules-based regional water governance framework. India must leverage multilateral platforms like the UN Watercourses Convention (1997) — though neither India nor China is a party — and strengthen bilateral mechanisms. Future implications include possible Chinese diversion plans (e.g., the 'Great Western Route' of the South-North Water Transfer Project), increased flood unpredictability, and the imperative for India to accelerate its own basin-level planning, early warning systems, and diplomatic engagement. For aspirants, this issue epitomizes the intersection of geography, polity, IR, and environment — a quintessential UPSC theme.