Background
With an installed capacity of 23 MW, Mewa Khola Hydropower Project is run of river hydropower project located in Taplejung district. The progress of the project can be summarized in the table below.
| SN |
Description |
Status |
Remarks |
| 1. |
Feasibility Study |
Completed |
|
| 2. |
Initial Environment Examination |
Completed |
|
| 3. |
Power Purchase Agreement |
Completed (Take or Pay) |
|
Salient Features
| General |
| Source River |
: Mewa River |
| VDC |
: Papung |
| District |
: Taplejung |
| Zone |
: Mechi |
| Development Region |
: Eastern |
| Province no. |
: One |
| Toposheet no. |
: 2787 07 |
| Type of Scheme |
: Run-of-River |
| Latitude |
: 27035’48” N to 27032’55” N |
| Longitude |
: 87035’14” E to 87037’00” |
| Gross Head |
: 893.00m |
| Net Head |
: 879.21m |
| Design Discharge |
: 3.16 m3/s |
| Installed Capacity |
: 23.00 MW |
| Plant Factor |
: 70% |
| Net Annual Generation |
: 136.797 GWh |
| |
|
| Hydrology & Meteorology |
| Catchment Area at Intake |
: 66.75 km2 |
| Catchment Area at Power house |
: 94.30 km2 |
| Average Annual Precipitation |
: 2344.6 mm |
| Design 100-yrs Flood |
: 78.00 m3/s |
| 20-yrs Flood Discharge at Intake |
: 23.90 m3/s |
| Long-term Average Flow |
: 4.04 m3/s |
| Design Discharge |
: 3.16 m3/s |
| Riparian Release |
: 0.094 m3/s |
| |
|
| Diversion Weir |
| Type |
: Overflow |
| Length |
: 11.50 m |
| Crest Level |
: 2923.00 amsl |
| Height |
: 2 m |
| |
|
| Intake |
| Type |
: Side Intake |
| No |
: 2 |
| Opening Size |
: 2.90 X 1.5 m (W x H) |
| Sill Level |
: 2922.00 amsl |
| |
|
| Undersluice |
| Size (WxH) |
: 2.5 X 2.7m (WXH) |
| No. of Bays |
: 1 |
| Sill Level |
: 2921.00 amsl |
| |
|
| Gravel Trap |
| Length of Gravel Trap |
: 4.5 m |
| Width of Gravel Trap |
: 2.4 m |
| Water Depth |
: 2 m |
| Depth of Storage |
: 0.8 m |
| Total Depth at Beginning |
: 2.8 m |
| |
|
| Approach Canal |
| Type |
: Open |
| Length |
: 30 m |
| Length of Spillway |
: 12 m |
| Length of Bifurcation canal |
: 14 m |
| |
|
| Desilting Basin |
| Location |
: Surface |
| Type |
: Double bay intermittentflushing |
| No of Basin |
: 2 |
| Size (L x W x H) |
: 60 m x 10 m x 4.5 m |
| Particle Size to be settled |
: 0.1 mm |
| Size of flushing opening |
: 0.5 mx 0.5m |
| |
|
| Headpond |
| Location |
: Surface |
| Type |
: Trapezoidal |
| Side slope |
: 0.5 H : 1 V |
| Size (L x W x H) |
: 13 m x 6.80 m x 4.2 m |
| |
|
| Headrace Pipe |
| Type |
: Circular |
| Diameter |
: 1.1 m |
| Length |
: 106 m |
| |
|
| Headrace Tunnel |
| Type |
: Inverted D-Shape pressurized |
| Size |
: 2.2 m x 2.5 m (W X H) |
| Length |
: 3642.00 m |
| |
|
| Surge Shaft |
| Type |
: Top over to sky |
| Diameter |
: 4 m |
| Height |
: 28.50 m |
| Normal Water level |
: 2923.00 amsl |
| Max. Upsurge |
: 2930.45 amsl |
| Max. Down surge |
: 2906.20 amsl |
| |
|
| Pressure Shaft |
| Type |
: Buried |
| Pipe Material |
: Mild Steel |
| Length |
: 1571.00 m |
| Diameter |
: 1.10 m |
| |
|
| Bifurcation Penstock |
| No |
: 2 |
| Length |
: 13.5 m |
| Diameter |
: 0.78 m |
| |
|
| Powerhouse |
| Location |
: Underground |
| Clear Size (L x B x H) |
: 56 m x 13.2 m x 22.7 m |
| Number of Units |
: 2 Nos. |
| Type of Turbine |
: Pelton |
| Rated Capacity |
: 11.5 MW x 2 Nos. |
| |
|
| Access Tunnel |
| Type |
: Inverted D shaped |
| Diameter |
: 5 m |
| Length |
: 160.00 m |
| |
|
| Tailrace Tunnel |
| Type |
: Inverted D shaped tunnel |
| Diameter |
: 3.00 m |
| Length |
: 200.00 m |
| |
|
| Transmission & Grid Connection |
| Specification |
: 132 kV Single Circuit |
| Conductor |
: SC ASCR Wolf |
| Length |
: 27 km (up to Dhungesanghu substation, Common Transmission Line) |
| |
|
| Transformers |
| Step-up Transformer |
|
| Type |
: In door Oil Immersed |
| Cooling |
: OFWF |
| Number of Units |
: 7 Nos. |
| Rated Capacity |
: 4.7 MVA x 7 Nos. |
| |
|
| Generator |
| Type |
: Synchronous, salient pole |
| Specification |
: 14000 kVA, 11000 V, 50 Hz |
| Synchronous Speed |
: 1000 rpm |
| No. of Pole |
: 3 pairs |
| |
|
| Power and Energy |
| Installed Capacity |
: 23.00 MW |
| Dry Season Energy |
: 42.593 GWh |
| Wet Season Energy |
: 94.205 GWh |
| Total Annual Energy |
: 136.797 GWh |
| Plant Load Factor |
: 70.00% |
| |
|
| Financial Indicators |
| Project IRR |
: 15.18% |
| B/C ratio |
: 1.54 |
| Average DSCR |
: 1.52 |
| Construction Period |
: 42 months |
