THE PROJECT
Seti Khola Hydropower Project is a run-of-river type project with an installed capacity of 22 MW designed to generate 133.432 GWh energy annually. The project area is located between the elevation of 633 meters and 500 meters above mean sea level. It is in the middle reaches of Seti Khola in Kaski District, Gandaki Province, Nepal. More specifically, the project area is located between longitudes 84004’15″E to 84005’28″E and latitudes 2805’00″N to 28008’05″N. The Project is designed / built by Clean Energy Consultant Pvt. Ltd. The Civil works contract is being implemented by M&A Construction, a construction company that belongs to the Developer’s shareholders.
THE PROJECT
All the components of the project lie in the right bank of Seti River within Pokhara Metropolitan, Ward No. 33. The project components include the Headworks, Settling basin, Headrace tunnel as well as Headrace pipe, Surge tank, Penstock Pipe, Powerhouse, Tailrace and Switchyard. The Headworks is accessible through a 2 Km long Pitchroad from Gagangauda on Prithivi Highway. Likewise, an all season gravel road 5 km long connects the Powerhouse to Gagangauda Mode independently. Both roads have been widened and upgraded in different sections by the project in coordination with Pokhara Metropolitan. The project has been promoted by Seti Khola Hydropower Pvt. Ltd. (SKHPL) which is a single purpose company established for the development of Seti Khola Hydropower Project.
The Power Purchase Agreement (PPA) for the sale of energy generated from the project has been signed with Nepal Electricity Authority (NEA). The generated electricity will be evacuated through an approximately 1.5 km long 132kV Transmission line to the 132 kV Lekhnath- Damauli Transmission Line between 53-56 no tower of Nepal Electricity Authority (NEA). The company has already acquired Generation License for Construction from Department of Electricity Development (DoED), Ministry of Energy, Water Resource and Irrigation and the project has embarked on construction since April 2021.
SALIENT FEATURES
| Parameter | Value |
|---|---|
| Latitude | 28°05’00″N to 28°08’05″N |
| Longitude | 84°00’15″E to 84°05’28″E |
| Type of Scheme | Run off River |
| Access Road | Intake and Powerhouse site easily accessible from Prithivi Highway |
| Installed Capacity | 22 MW |
| Gross Head | 68 m |
| Rated Design Head | Max-67.3 m, Min-63.90 m |
| Design Plant Discharge | 39.91 m³/sec at Q42% |
| Parameter | Value |
|---|---|
| Catchment Area | 876.92 sq km |
| Average Precipitation | 3898 mm/year |
| 100 years Design Flood | 4596 m³/sec |
| 100 years Design Flood (PH) (HW) | 4876 m³/sec |
| Construction Flood Intake | 264.02 m³/sec |
| Construction Flood PH | 280.11 m³/sec |
| Minimum Monthly flow | 14.22 m³/sec |
| Design Discharge (Q42%) | 39.91 m³/sec |
| Riparian Release | 1.39 m³/sec |
| Parameter | Value |
|---|---|
| Diversion Structure | Barrage with Radial Gate |
| Length of Barrage | 40 m |
| No of Gates | 3 Radial Gate |
| Size of Barrage gates (bxh) | 10m x 7m |
| Crest level of Barrage Gates | EL 574.00 msl |
| Size of Sluice gate (bxh) | 10m x 7m |
| Max Supply Level | 585.00 m |
| Min Drawdown Level at dam | 583.00 m |
| Min Drawdown level in | 576.30 m |
| Intake Type | Forebay, Side Intakes |
| Size of Intake openings | 2‐6.75m x 1.6m, 2‐5.75m x 1.6m – 4 nos (2 each Desander bays) |
| Crest elevation of Intake | El 580.60 msl |
| Parameter | Value |
|---|---|
| Type | Double Chamber Continuous Flushing |
| Particle Size to be Settled | 0.20mm |
| Size of Desander | 2 Nos, L=84m x W=24.80m and H=7.0m to 9.6m (revised) |
| Settling Length | 84m (revised) |
| Inlet Transition Length | 21.4m |
| Outlet Channel End | 32.5m (up to Portal) |
| Collector/Flushing Channel: Transition Length | 5m x 3m x 2 nos |
| Bed Slope | 1:50 |
| Desander Outlet Gates | 2 Nos each side x 5m x 2.5m, Vertical Sliding Gates |
| Desander Outlet Gates Invert | 579.83 msl |
| Parameter | Value |
|---|---|
| Type | Inverted “D” Shape, Free Flow Tunnel |
| Tunnel Length | 3105m (revised) |
| Size of Tunnel | 5.8m x 5.8m |
| Tunnel Bed Slope | 0.736111111 |
| Nos. of Bend | 2 no. |
| Rock Trap | At the forebay before Bellmouth |
| Nitches | 5 Nos, 3m x 3m @ 500m in length |
| Parameter | Value |
|---|---|
| Type | Circular RCC Construction, Ribbed RCC Cylindrical Prestressed Concrete |
| Size | D=19m and H=22.4m |
| Invert Level | EL 571.8m |
| Top Level | 593.30m |
| Max Water Level | 591.5m |
| Normal Water Level | 583.4m |
| Min Drawdown Level at | 579.90m |
| CL level of Penstock Inlet Peaking | 569.55m |
| Parameter | Value |
|---|---|
| Type | Buried Steel Headrace Pipe |
| Length | 175m (Including Branches) 4m |
| Diameter Thickness | dia, 12-20mm thick Confirming |
| Pipe Material | IS 2062-B E350 |
| Yield Strength | 350 MPa |
| No of bends/Blocks | 2 Nos |
| Parameter | Value |
|---|---|
| Type | Buried Steel Penstock Pipe |
| Length | 780m (Including Branches) 4m |
| Diameter Thickness | dia 12-28mm thick Confirming |
| Pipe Material | IS 2062-B E350 |
| Yield Strength | 350 MPa |
| No of bends/Blocks | 11 Nos |
| Parameter | Value |
|---|---|
| Type | Semi Surface |
| PH Dimension (l x b x h) | 27.3m x 20.5m x 26.28m |
| Height of PH Building | 12.5m from Machine hall |
| PH Access Floor Level | EL. 521.27m |
| CL of Runner | EL. 513.70m |
| Tailrace Gate Invert Level | EL 513.70m |
| Parameter | Value |
|---|---|
| Type | Circular MS Buried Pipe Ribbed Construction for Low Pressure Flow |
| Diameter | 4m |
| Length | 440m |
| Slope | 1 in 1000 |
| Invert Level of Tailrace outlet | EL 512.14m |
| Parameter | Value |
|---|---|
| Number of Units | 2 |
| Type of Turbine | Francis |
| Shaft Arrangement | Vertical |
| Rated Discharge for Each Turbine | 19.96 m3/s (plus 10% CoL) |
| Rated Head | 63.90m |
| Rated Output for Each Unit | 11,500 kW (plus 10% CoL) |
| RPM | 300 |
| Rated Efficiency | 92% (at 100% discharge) |
| Speed Governor | Electro-Hydraulic |
| Parameter | Value |
|---|---|
| No of Units | 2 |
| Generator Type | 3 ph AC Synchronous |
| Excitation | Brushless excitation |
| Rated Voltage | 11.0 kV |
| Power Factor | 0.85 |
| Layout | Vertical |
| Rated Efficiency | 0.97 |
| Installed Capacity (Rated) | 12.94 MVA (plus 10% CoL) |
| Max Output Potential | 14.3 MVA |
| Rated Frequency | 50 Hz |
| Parameter | Value |
|---|---|
| Type | Step up power transformer |
| Rated Efficiency | 0.99 |
| No of Unit | 1 x 3 ph, 50 Hz |
| Capacity | 27.625 MVA (plus 10% CoL) |
| Types of connection | Star/Delta |
| Type of Cooling | ONAN (oil natural air natural) |
| Voltage Ratio | Primary (LV Side): 11 kV Secondary (HV Side): 132 kV |
| Parameter | Value |
|---|---|
| Type | Indoor type |
| Rated Power Output | 250 kVA |
| No of Units | 2 |
| Type of Cooling | ONAN |
| Voltage Ratio | Primary (11.0 kV) / Secondary (0.4 kV) |
| Connection / Vector Group | Dyn11 |
| Parameter | Value |
|---|---|
| Power – Proposed Tapping Tower | 0.75 km between Tower No 53 and 56 |
| Type of Circuit | Double Circuit Tower for Loop in Loop out connection |
