The world's highest hydel power project 'Rongtong' is located in ________

The world's highest hydel power project 'Rongtong' is located in Himachal Pradesh. Rongtong is a 2MW project that is located in the Lahaul-Spiti district on Rongtong Nullaha, a tributary of Spiti river. Located at an elevation of 3,600 metres in a snow adhered region, this was the first hydel project executed for the socio-economic upliftment of the tribals of this area. It is one of the highest in the world.