Simbuwa Khola Hydroelectric Project is proposed to be developed in Tapethok VDC of Taplejung district of Nepal, utilizing the flow of Simbuwa Khola, a tributary of Arun River. The scheme is 53.7 MW Run-of-Rive type hydropower project with a gross head of 770 m and design discharge of 8.5 cumec at 40% flow exceedance level. Based on the earlier study, the major structures of the project are the spillway weir, undersluice and appurtenant structures, approach canal, desanding basin, a headrace tunnel of 4.03 km length, which will lead to a 35 m high surge shaft. The design flow will be directed towards the powerhouse through a 700 m drop shaft followed by a 800 m inclined shaft. The annual energy generation from the project will be 226.44 GWh and the electricity generated will be evacuated through the Koshi Corridor.
Salient Features
| Name of the River | : | Simbuwa Khola |
| Location | : | Taplejung District, Nepal |
| Layout | : | Left bank |
| Type of Scheme | : | Run-of-river |
| Latitude | : | 87°47’20.96” E to 87°52’13.73” E |
| Longitude | : | 27°30’00” N to 27°31’46.45” N |
| Catchment area at intake site | : | 246 Km2 |
| Normal Water Level at Desanding Basin | : | 2200 m amsl |
| Turbine Axis Level | : | 1430 m amsl |
| Gross Head | : | 994 m |
| Net Head | : | 964.18 m |
| Design Discharge (Q40) | : | 9.24 m3/s |
| Headworks Structure | : | Spillway weir, undersluice and appurtenant structures, approach canal, desanding basin, connecting tunnel |
| Length of Approach Canal | : | Approx. 250 m |
| Length of Connecting Canal (From Desanding Basin to Headrace Tunnel Inlet Portal) | : | 420 m, at the end of flushing chamber Headrace Tunnel |
| Length | : | 4.03 Km |
| Surge Shaft | : | Height: 35 m, Diameter: 9 m |
| Length of Drop Shaft | : | 950 m |
| Length of Inclined Shaft | : | 800 m |
| Length of Tailrace Conduit | : | 100 m |
| Installed Capacity (MW) | : | 75.6 MW |
| Total Annual Energy (GWh) | : | 421.39 |
| Power Evacuation | : | Proposed Koshi Corridor |