Official technical parameters and hydraulic specifications for the Tila-1 Hydropower Project based on the Detailed Project Report (DPR) formulated by Shah Consult International (P.) Ltd. and approved by the Department of Electricity Development (DoED), Ministry of Energy, Water Resources and Irrigation, Government of Nepal.
| Project Name | Tila-1 Hydropower Project (T1HPP) |
| Project Developer | S.C. Power Company Pvt. Ltd. (SCPCPL) |
| Scheme Type | Peaking Run-of-River (PRoR) with 6-Hour Daily Peaking Storage |
| Licensed Capacity | 440 MW (PPA Capacity: 298.75 MW) |
| Province & District | Karnali Province, Kalikot District, Nepal |
| Source River | Tila River (Major perennial tributary of Karnali River Basin) |
| Dam Site Coordinates | Latitude: 29°06’ 00” N | Longitude: 81°44’ 38” E (Downstream of Tila–Ruru Confluence) |
| Powerhouse Site Coordinates | Latitude: 29°10’ 00” N | Longitude: 81°52’ 00” E (Underground, upstream of Serighat Village) |
| Gross Head | 510.00 meters |
| Rated Net Head | 468.00 meters |
| Design Discharge | 101.00 m³/s (4 Pelton units) |
| Total Catchment Area at Intake | 3,355 km² |
| Rain-fed Catchment Area | 3,080 km² |
| Snow-fed Catchment Area | 275 km² (Assuming permanent snowline at EL. 4,500 masl) |
| Annual Average Precipitation | 1,082 mm |
| Annual Average Runoff Yield | 803 mm |
| Probable Maximum Flood (PMF) | 13,821 m³/s (cumecs) |
| Diversion Flood Discharge (1-in-10-Year) | 660 m³/s (cumecs) |
| Full Reservoir Level (FRL) | 1,295.00 masl |
| Minimum Draw Down Level (MDDL) | 1,275.00 masl |
| Gross Storage Volume | 2.30 Million Cubic Meters (MCM) |
| Live Peaking Storage Volume | 1.70 Million Cubic Meters (MCM) |
| Reservoir Surface Area at FRL | 11.60 hectares |
| Reservoir Backwater Length | 895 meters |
| Dam Structure Type | Concrete Gravity Dam |
| Dam Crest Elevation (Top Level) | 1,298.00 masl |
| River Bed Elevation | 1,243.00 masl |
| Dam Height above River Bed | 55.00 meters |
| Dam Crest Length | 182.40 meters |
| Spillway Configuration | Gated Ogee Type with Breast Wall |
| Number of Spillway Bays & Gates | 7 Radial Crest Gates |
| Gate Dimensions | 7.70 m (width) × 13.50 m (height) each |
| Spillway Crest Elevation | 1,255.00 masl |
| Energy Dissipator | Trajectory Type Ski-jump Bucket (Invert: 1,243.0 m, Lip: 1,247.69 m) |
| Diversion Tunnel Dimensions | 462 m length, 7.60 m diameter, Modified D-shape, pressure flow |
| Diversion Tunnel Capacity | 660 m³/s (1-in-10-year flood capacity) |
| Power Intake Design Discharge | 122.12 m³/s (includes 20% sediment continuous flushing discharge) |
| Number of Intake Bays | 2 Openings with inclined trash racks (10° from vertical) |
| Intake Sill Invert Level | 1,265.50 masl |
| Feeder Tunnels | 2 D-shaped tunnels, 4.40 m diameter (Tunnel 1: 195.5 m | Tunnel 2: 153.5 m) |
| Desilting Basin Type | 2 Dufour-type underground sediment settling chambers |
| Desilting Basin Dimensions | 12.0 m (width) × 18.8 m (height) × 290.0 m (length) each |
| Sediment Exclusion Threshold | All particles coarser than 0.20 mm diameter |
| Silt Flushing Tunnels | 2 Modified D-shaped free-flow tunnels (1.5 m × 2.7 m; 42 m & 77 m length) |
| Headrace Tunnel (HRT) Length | 13,770 meters (13.77 km) |
| Tunnel Cross-Section & Lining | Modified Horseshoe shape, 6.00 m internal diameter, concrete lined |
| Design Waterway Discharge | 101.76 m³/s |
| Construction Access Adits | 6 Adits (5.0 m × 6.0 m modified D-shaped) |
| Surge Shaft Type | Open to sky, restricted orifice circular surge tank |
| Surge Shaft Dimensions | 10.00 m internal diameter, 128.00 meters vertical height |
| Surge Levels | Top: 1,350.0 masl | Max Upsurge: 1,348.0 masl | Min Downsurge: 1,227.5 masl |
| Main High-Pressure Shafts | 2 Steel-lined circular shafts, 3.25 m diameter (Shaft 1: 846 m | Shaft 2: 816 m) |
| Branch Penstocks | 4 Steel penstocks, 2.50 m diameter (Lengths: 43 m, 38 m, 56 m, 50 m) |
| Powerhouse Cavern Type | Underground rock cavern complex |
| Machine Hall Cavern Sizing | 18.50 m (width) × 69.50 m (length) |
| Transformer Cavern Sizing | 16.00 m (width) × 121.90 m (length) |
| Turbine Type | Vertical-axis Pelton Wheel Turbines |
| Number of Turbine Units | 4 Units |
| Rated Capacity per Unit | 110 MW per turbine (440 MW total mechanical output) |
| Turbine Efficiency | 92.0% |
| Governor System | High-precision electronic governor with PID digital control |
| Generators | 4 Units, Synchronous, 3-phase, salient pole, brushless excitation |
| Generator Rating | 88.23 MVA per unit, 11 kV generation voltage, 50 Hz, 0.85 power factor |
| Generator Efficiency | 97.0% |
| Step-Up Transformers | 13 Single-Phase units (including 1 spare), 29.5 MVA each, 11 kV / 400 kV, ONAN, 99% efficiency |
| Tailrace Tunnel | 642 meters length (Free-flow discharge back to Tila River) |
| Grid Transmission Line | 400 kV Double Circuit, 6 km length connecting to RPGCL Phukot Hub Substation |