Hydropower & the rivers of Arunachal

The eastern Himalaya carry some of the steepest, highest-volume rivers in India, and Arunachal Pradesh alone is estimated to hold around 50,000 MW of hydropower potential — by far the largest untapped reserve in the country. The Siang (the name the Brahmaputra takes in Arunachal), the Subansiri, the Lohit and the Kameng are the great water highways being eyed to power not just the Northeast but the national grid.

The flagship project is the Subansiri Lower Hydroelectric Project on the Assam–Arunachal border, at 2,000 MW one of India's largest, long delayed and now nearing completion. Many more are planned across Arunachal, and the state sees hydropower royalties as a central pillar of its future revenues.

This is also the region's most debated development question. Large dams promise clean, renewable power and income, but raise real concerns about seismic risk in a fragile Himalayan zone, downstream flooding and ecology in Assam, and the rights of local communities. The future of Northeast hydropower will hinge on getting that balance right — building the clean energy the country needs while respecting the rivers and the people who live by them.