Himachal Pradesh Power Corporation Limited

Nakthan HEP is being conceived as a Run-of-River project on Tosh Nallah/Parbati River (a left bank tributary of Beas River) in Kullu District of Himachal Pradesh. The Project envisages the construction of the diversion barrages across Parbati river and Tosh Nallah conveying the water so diverted through two independent HRTs to meet at a common point followed by a single HRT of bigger diameter terminating into an underground surge shaft which conveys water through pressure shaft (two vertical limbs to facilitate the construction) thus, utilising a gross head of approximately 697.75 m and feeding underground power house having four machines with total installed capacity of 460.0 MW (4 x 115.0 MW). The discharge from the power house is conveyed through tail race tunnel (TRT) into the Parbati River. The project is expected to generate 1548.31MU of electricity in 90% dependable year.