Upper Siang Hydroelectric Project

The Upper Siang Hydroelectric Project, also known as the Upper Siang Multipurpose Project or Siang Upper Multipurpose Project (SUMP) is the biggest hydroelectric power project planned in the Upper Siang district of Arunachal Pradesh, India. Projects planning was commenced by the National Hydroelectric Power Corporation (NHPC) in April 2009 and various hydro dams will be constructed in phases over a span of 15–20 years.

The main dam is being constructed across the Siang river and upon completion, the dam reservoir will hold 9 billion cubic meters of water. The hydro power project at Siang will alone generate approximately 11,000 MW, making it the largest hydroelectric dam in the Indian subcontinent.