About Project Name of Project Nalsing Gad Storage Project District Jajarkot Location of project site 82°1400E-82°1912E Longitude 28°4728N-28°5800N Name of the River Nalsyagu Gad River Type of Scheme Storage Project Road 25 Km Geology Dam Site Dolomite with frequent intercalation of black Shale Tunnel Limestone, Dolomite and Shale Powerhouse Sandstone Seismic Survey 58 Profiles – Total 8165 meter Core Drilling 14 Holes – Total 602 Meter Hydrology Catchment Area (up to Dam site) 571.5 Km² Average Precipitation 1718 mm Average Monthly Flow 29.35 m³/s Flood Discharge (1 in 20 year wet season) 675 m³/s Flood Discharge (1 in 10,000 year wet season) 2244 m³/s Probable Maximum Flood (PMF) 4488 m³/s Sediment Yield 3960 t/km²/year Diversion Tunnel Shape Circular Shaped Type Concrete Lined Diameter 8.0 m Length 1145 Reservoir Full Supply Level (FSL) 1570 masl Minimum Operating Level (MOL) 1498 masl Total Storage volume 419.6 Million m³ Live Storage Volume 296.3 Million m³ Dam Type Ogee shaped, non gated side channel Maximum Height above Foundation 200m Crest Elevation 1580.30 masl Length of Crest 545.00 m Width of crest 10 m Spillway / Gated Spillway Type Ogee Shaped ,open chute way with gate controlled weir, flip bucked and plunge Pool Design Flood (1 in 1000 years) 1510 m³/s Overflow Crest Elevation EL.1555.30 Effective overflow Width 24m Length of Spillway Chute 420.00m Length of Plunge Pool 170 m Radial Gate (No. and W ×H) 2 Nos. (12.0 m × 18.0m) Side Spillway / Emergency Spillway Type ogee shaped, non gated side channel overflow weir Design flood (1 in 1000 years) 1510 m³/s Overflow Crest Elevation EL.1555.30 masl Effective overflow Width 120 m Main Intake Type Sloping Deck Level 1575 masl Intake Tunnel 1 No. Invert level of intake 1481.0 masl Intake Openings 6 Nos.(5.0m×3.5m) Headrace Tunnel Length 8215 m Type Concrete lined modified Horse Shoe Finished Diameter 5.7 m Surge Tank Type Restricted Orifice Height 171.97 m Diameter 12.0 Max Water Level 1607.30 masl Min Water Level 1454.12 masl Top level 1610.97 masl Invert Level (of tunnel below surge tank) 1439.00 masl Inclined Shaft Shape Circular Inclination 60° Height 564 m in two stages Diameter 4.2 m Length 900m High Pressure Tunnel Type Steel Lined Penstock Length 90m Finished Diameter 3.9 m Powerhouse Type Steel Line Penstock Length 90m Finished Diameter 3.9 m Powerhouse Type Under Ground Size (L× W ×H) 106 m × 13m × 31 m Tail Water Level (turbine pit) 867.6 masl Turbine Type of Turbine Vertical Axis Pelton Turbine Number of Units 4 No Turbine Centre line level 872 masl Installed Capacity 410 MV (4× 102.5 MW) Tailrace Shape Inverted D shaped Type Concrete Lined Size (W × H) 4.5 m × 3.5 m Tail Water Level ( at outlet) 863.3 masl Transmission Line Length 112 km Voltage 400k V Circuit Double Interconnection Point Kohalpur S/S Power Maximum Gross Head 698.0 m Designed Net Head 635.5 m Maximum Net Head 684.36m Minimum Net Head 612.11m Design Discharge 75.0 m³/s Maximum Power Flow 77.92 m³/s Overall Efficiency 87.80 % Maximum Daily Generation 12 equivalent hrs Minimum Daily Generation 2 equivalent hrs Installed Capacity 410 MV Energy Dry Season Energy (November to April) 643.29 GWh Wet Season Energy (May to October) 150.88 GWh Spill Energy 611.89 GWh Total Energy 1406.06 GWh Regulated Energy 56.19% Plant Factor (Spill Energy not Considered) 22.11% Discharge Utility Factor (Spill Energy not Considered) 53.83% Plan Factor (Inclusive of Spill Energy) 39.15% Discharge Utility Factor (Inclusive Of Spill Energy) 98.09% Project Cost Total Project Cost (Base Cost) 737.39 MUS$(2012 Price Level) Local Component 157.75 MUS$(2012 Price Level) Foreign Component 579.64 MUS$(2012 Price Level) Installation Cost 1799 US$ per kW Financial Indicators Total Project Cost (Base Cost) NRs. 64153.19 Million (At exchange rate of NRs. 87.00) Final Cost ) NRs. 108,263.74 Million Total Debt NRs. 26,665.66 Million Interest Rate on Debt 8.0% Expected Return on Equity NRs. 64153.19 Million (At exchange rate of NRs. 87.00) Average Energy Cost (for 14% return on equity) Nrs. 9.11/KWH for Total Energy (2012 Price Level) Average Energy Cost (for 14% return on equity ) NRs.16.09/KWh for saleable Energy (2012 Price Level) Debt Service Ratio 2.0 (in the First year of operation) Financial Internal Rate of Return 8.9% Benefit Cost Ratio 1.15 (at 10 % discount rate) Payback period 12.18 Year Analysis Period 25 years Economic Indicators (Based on Avoided Cost) Economic Internal Rate of Return 21.88% Benefit Cost Ratio 2.25 (at 10% discount rate) Net present Value 738.64 Million US$ Pay Back Period 12.18 Years Specific Energy Cost for Hydro 16.31 US Cent/k Wh (at 10% discount rate) Specific Energy Cost for Thermal 36.72 US cent/k Wh (at 10 % Discount rate) Analysis Period 25 years Economic Indicators (Based on LRMC Cost) Winter Season Energy Rate 12.72 US Cent per KWh Summer Seasons Energy Rate 3.82 US Cent per KWh Emission Benefit 0.598 US Cent per kWh Benefit Cost Ratio 2.25 (at 10% discount rate) Net Present Value 76.57 Million US$ ( at 10% discount rate) Environmental Impact Assessment (Based on Prefeasibility Study) Relocation of Houses 150 Inundation of Forestland 270ha Inundation Of Forestland 290ha Number of People Affected 825 Environmental Cost 11.81 MUS$
Posted on: Thu, 04 Sep 2014 08:09:56 +0000
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