The Chilime Hydropower Plant is a peaking run off river type plant constructed and owned by Chilime Hydropower Company Limited. It is located at 133 km north of Kathmandu at the right bank of Bhotekoshi River in Rasuwa District. The plant with the installed capacity of 22.1 MW is delivering power to the National Grid through a 38 km long 66 kV single circuit transmission line at Trisuli Power House Switchyard at Trishuli, Nuwakot.
The electricity generated from the power plant is purchased by NEA at the powerhouse and evacuated as per the PPA made on June 25, 1997 and its first amendment made dated December 10, 2007. The annual deemed energy salable to NEA is 132.918 GWh, excluding penalty-free outage of 720 MWh (36hours) annually.
The plant has started its commercial generation from 00:00 hours of 8th Bhadra 2060 (24th August 2003). During nine years of its operation, the plant has been operating successfully.
Generation statistics of the Plant
Deemed Generation (MWh)
Transmitted Metered Energy(MWh)
Chargeable Energy (MWh)
Type of scheme
Run of river with peaking pondages
22.1 M W(2*11.05 M W)
Average annual energy
137.9 GWh (137 million units)
132.9 GWh(132 million units)
2*5.50 m*1.2 m
Diversion Weir( L*H)
13 m*3.25 m
Desanding Basin Type
Dufour (Double Chamber)
Desanding Basin Dimension (L*B*H)
60 m* 7.5 m*3.75 m
58 m*2.2 m (Steel Pipe)
Power Canal (L*B*H)
606 m* 2.2 m* 2.2 m
Feeder canal with Bemdang khola (L)
Peaking pondage Storage Capacity
Pressure Conduit (L)
Headrace Tunnel (L)
Underground Surge tank (D* H)
6.5 m*33 m
Underground Penstock (L*D)
635.5 m*1.64 m to 2.17 m
Transformer Cavern (L*W*H)
67 m*10 m* 7.5 m
Switchgear Room (L*W*H)
14 m* 12 m*8.5 m
Powerhouse Cavern (L*W*H)
40 m to 50 m *16 m* 16.5 m
Tailrace tunnel (L*W*H)
243 m* 3 m* 3 m
Turbine (Type & output)
Horizontal, Pelton (2*11.28 MW) Digital Governor
Generators (Type, Capacity & Voltage)
Brushless Excitation, 13 MVA, 11 KV
Transformers (Type, Capacity & Voltage)
Single Phase, 4.25 MVA * 7 Nos.
Switch gear Type
Gas Insulatyed Metal Clad (GIS System)
Transmission Line (L*V & Circuit)
38 KM * 66 KV Single Circuit (Wolf Conductor)
Performance & Summary
PERFORMANCE OF PLANT
The power plant has very efficient and robust electromechanical equipments, as a result, the plant is able to generate 13.8% excess energy in addition to the deemed energy as per the Power Purchase Agreement with Nepal Electricity Authority. In fiscal year 2067/068, the plant has been successful in delivering chargeable deemed energy 132.79 Gwh, chargeable excess energy of 10.07 Gwh and free excess energy 8.26 Gwh. Insurance of the plant has been made with Rastriya Beema Sansthan.
SUMMARY OF PLANT STATUS
The hydraulic structures of the plant are in good condition and major repair works have not been required so far. The main equipments have proven to be robust and the whole electromechanical system design has proven to be effective and as per the conditions and practices of the Nepalese system. It is seen from the data that the generation from the plant, for last seven years, has been fairly higher than the deemed generation.
Improvement in the system such as cooling water system, intake trash rack, desander flushing, reservoir flushing, etc., has contributed to the high availability of the plant. As a result the plant has been able to generate excess energy besides deemed energy from the 2nd year of its generation.