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In the world's largest blackout, some 600 million Indians lost power Tuesday. It is the second major failure of the country's power grid this week. Exactly what caused these monumental power outages is still under investigation, but the blackouts are raising new questions about India's rising energy needs. In this series, GlobalPost looks at the nearly 150 dams planned for the state of Arunachal Pradesh. Together, the dams would fill India's energy gap. But they will also devastate dozens of indigenous tribal peoples, wipe out thousands of acres of breathtaking forest and destroy some of the world's best whitewater.

India arunachal pradesh landscape 2012 04 20
(Scott Ligare/GlobalPost)

Map of dams planned for Arunachal Pradesh

This map shows 113 projects, though the current number of planned projects is more than 147. All major projects are depicted here.

Credit: Sanctuary Asia (adapted from map of Dept. of Hydropower, Government of Arunachal Pradesh). Click on the image for a larger version of the map.