Dhauliganga Hydroelectric Scheme, Uttar Pradesh, India

Dhauliganga Hydroelectric Scheme, Uttar Pradesh, India

Uttar Pradesh, India

Project facts

Project Type: Hydroelectric scheme

Installed Capacity: 280 MW

Commissioning date: 1999

This scheme is being built about five kilometres upstream of the confluence of the river Dhauliganga with the river Kali, where the Kali forms the border of India and western Nepal, and about 600 kilometres north-east of the Indian capital Delhi.

The 280 MW run-of-river scheme produces peak energy for the northern Indian power system (about 1200 GWh in an average year). A concrete-faced rockfill dam, about 50 metres high and founded on deep alluvial deposits, creates a small daily storage reservoir. The headworks, adjacent to the dam, are a gated spillway and intake structure for the five-kilometre pressure tunnel. Two vertical pressure shafts feed four Francis turbines, installed in an underground power cavern, with adjacent, parallel cavern for the transformers and SF6 switchgear.

As with many Himalayan schemes, a key factor in the design of the headworks was the need for settlement and flushing of heavy sediment load of the Dhauliganga in the monsoon season. As a result, twin underground desilting chambers are being excavated at the upstream end of the pressure tunnel. The head developed is 310 metres. The engineering services have being carried out in close co-operation with the client's personnel, and included a major technical training programme.