Mugu Karnali Storage HEP
Ministry of Energy, Water Resource and Irrigation has awarded Survey License of Mugu Karnali Storage Hydro Electric Project (1902 MW) to VUCl on July 06, 2018 for two years. The Project is at Karnali River in Karnali Province of Nepal.
Salient Features of the MKHEP(1902MW) |
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1.0 |
General Information/Parameters |
Details |
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River |
Karnali |
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Type of project |
Storage |
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Location |
Mugu, Humla, Bajura, Kalikot and Jumla District |
Karnali Province and Sudurpashchim Province |
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Co-ordinates of the Project area |
290 23' 43'' N to 290 41' 22'' N latitude, |
810 39' 14'' E to 810 57' 13'' E longitude |
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Access Road Name |
Karnali Corridor Highway |
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Climate |
Moderate |
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Design Consultant |
NEA Engineering Company Ltd. |
2.0 |
Hydrology |
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Catchment area at intake |
16,098.30 km2 |
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Design discharge |
793.45 m3/s |
Mean Annual Discharge |
326.10 m3/s |
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Maximum mean monthly discharge |
984.30 m3/s |
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Minimum mean monthly discharge |
56.40 m3/s |
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Minimum Environmental Release |
14,144.0 m3/s |
Probable Maximum Flood (PMF) at dam design (QPMF) |
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Flood Discharge for dam (Q10,000) |
6,043.0 m3/s |
Construction Flood (Q20) |
2,800 m3/s |
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3.0 |
Sediment Study |
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Average annual suspended sediment load (MT) |
6.61 |
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Estimated annual sediment yield (MT) |
8.26 |
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Maximum sediment load (kg / m3) |
10.38 |
4.0 |
Geology (Regional) |
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Major Rock Types in Damsite |
Banded gneiss, quartzite and Schist |
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Major Rock Type in Waterway |
Schist |
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Major Rock Type in Powerhouse |
Gneiss, quartzite and schist |
5.0 |
Structures |
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5.1 |
Dam |
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Crest Level |
1,358 masl |
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Type |
Rockfill Dam with Central Impervious Core and Filter |
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Crest Length |
1090.0 m |
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Lowest River Bed Level at Axis |
1075.0 masl |
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Height from River Bed level |
283.0m |
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Maximum Operating Level |
1,350.0 masl |
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Minimum Operating Level |
1,290.0 masl |
Total Capacity of Reservoir |
4,843.20 Mm3 |
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Live storage |
2,238.95 Mm3 |
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Dead Storage |
2,604.25 Mm3 |
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Regulation Method |
Daily Peaking |
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Inundation Area |
44.50 km2 |
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Back Water Length |
43 km |
5.2 |
Diversion During Construction |
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Construction Flood |
2,800.0m3/s |
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Diversion Type |
Cofferdam and 2 Nos. Diversion Tunnel |
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Length |
1,079.0 and 1,090.0 m |
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Section Details |
11.0 m Circular |
5.3 |
Intake |
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Intake Type |
Side intake |
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Number of Orifice |
4 |
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Size |
19.04m x 19.41m |
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Invert Sill Level |
1,259.0 masl |
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Gate Type |
Vertical Lift Gate |
5.4 |
Spillway |
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A |
Main Spillway |
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Type |
Low Ogee Shaped gated Chute |
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Number and opening size |
3 nos, 12.6 m x 18.50 m (W X H) |
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Gates |
Radial Gates |
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Energy dissipation |
Flip bucket and Plunge pool |
B |
Shaft Spillway |
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Type |
Shaft |
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Surge/Ventilation Tunnel Diameter |
6.0m |
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Number |
2 Nos |
C |
Morning Glory Spillway |
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Type |
Morning Glory |
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Number |
1 No. |
5.5 |
Water Conveyance |
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Type |
Circular underground tunnel |
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Material |
Concrete lined |
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Length |
5,65.0m |
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Diameter |
8.15 m |
5.6 |
Surge Shaft |
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Type |
Restricted Orifice |
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Shaft Diameter |
17.5m |
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Orifice Diameter |
7.25m |
5.7 |
Pressure tunnel |
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Material |
Steel Lined |
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Length |
555m (200m Vertical Shaft) |
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Internal Diameter |
6.85 m reducing to 5.0m; and 4.1 m |
5.8 |
Powerhouse |
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Type |
Underground |
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Plan Dimension |
271.0 x 24.0 x 56.55 (L X W X H) |
5.9 |
Downstream Surge Chamber |
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Number |
1 |
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SIze |
15m x 235m |
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Orifice Diameter |
7.25m |
5.1 |
Tailrace |
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Type |
Underground Tunnel |
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Numbers |
2 |
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Size |
11.25 diameter Circular shape |
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Length |
1,040.0 m |
6.0 |
Turbine |
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Type |
Vertical Axis Francis Turbine |
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Number of unit |
8 |
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Gross head |
276.0m |
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Rated Net Head |
271.0m |
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Rated Capacity per unit |
242.67 MW |
Discharge per unit |
99.18 m3/s |
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Turbine Efficiency |
92.50% |
7.0 |
Generator |
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Type of Generator |
Synchronous |
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Number of Unit |
8 |
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Rated Output |
279.78 MVA |
8.0 |
Transmission Line |
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Transmission Voltage |
400kV Double Circuit |
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Length |
40.0 km approx. |
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Connection Point |
RPGCL Substation |
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Number of tower |
107 |
9.0 |
Power and Energy |
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Installed Capacity |
1,902MW |
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Annual Dry Season Energy |
2,415 GWh |
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Annual Wet Season Energy |
3,876.8GWh |
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Total Annual Energy |
6,291.8GWh |
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Peaking duration |
7.7hrs |
10 |
Financial Parameter |
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Total Investment |
46,000 Corer |
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Base Year |
2024 |
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Total Project Duration yrs |
10 |
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Interest Rate of Return |
10% |
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Loan Repayment Period (yrs) |
12 |
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Debt/Equity Ratio |
75%,25% |
Note: |
The Government of Nepal intends to revise the Electricity Act to include provisions for downstream benefits related to storage projects. Incorporating downstream benefits may change the financial parameters. |