Tamakoshi 3 Hydropower-Project Bank
TAMAKOSHI 3 HYDROPOWER PROJECT (650MW)
|
Geographical Location (Districts) |
Dolakha and Ramechhap Districts |
|
Lead Government Agency |
The Ministry of Energy and Investment Board Nepal |
PROJECT DESCRIPTION AND RELEVANCE/ OBJECTIVES
Tamakoshi-3 project is a 650 MW hydropower plant with an annual generation of 2340 GWh. It is located in Dolakha and Ramechhap districts. The geological risks have been reduced significantly by reducing the size and realignment of tunnels and including additional adits for concluding construction in 5 years. The access roads to the project site and within the project facilities are well developed and needs minor upgradation. The planned transmission line of 400kV is already under construction which is due to finish construction by 2018.
PROJECT DETAILS
|
Project Cost (In USD) |
1,000 Million |
|
Project Land Required (in Ha.) |
Total land required: 929 1. Private : 318 2. Forests : 454 3. Others (river bed, river banks, wastelands): 157 |
|
Progress |
Feasibility study completed on February 2010 Technical update study conducted by Statkraft on August 2011 |
|
Planned Start Date |
Project award by May 2017 |
|
Expected Commencement Year |
TBA |
|
Project Documents Available |
Feasibility Study report 2010 (Sweco Norge AS) Technical Update study 2011 (SN Power) |
|
Form of Investment (PPP/Private Investment) |
Public-Private Participation |
|
Expected Fiscal Benefits to GoN |
Taxes, Royalty, VAT and Customs, Payment for Ecosystem Services, Free Electricity/Dividends |
SALIENT FEATURES OF THE PROJECT
|
Project coordinates |
"Longitude -860 4’ 34” E to 860 06’ 48” ELatitude -270 39’ 50” N to 270 34’ 36” NLongitude -860 05’ 00” E to 860 07’ 09” ELatitude -270 34’ 36” N to 270 29’ 34”N |
|
|
Project Location |
Dolkha District: Laduk, Jhyaku, Jugu, Lamidada, Sunkhani, Chhetrapa, Namdu, Phaski, Garimudi, Powati, Bhurkot, Jhule, Japhe, Ghyang Sukathokar, Bhedpu, Melung, Shahare, Malu VDCs and Bhimeshwor Municipality Ramechhap District: Phulase VDC |
|
|
HYDROLOGY AT INTAKE |
||
|
Catchment Area |
2,932 km2 |
|
|
Annual mean discharge |
152.5 m3/s |
|
|
Mean annual runoff |
4790 million m3 |
|
|
Maximum recorded discharge |
1313.8 m3/s |
|
|
Minimum recorded discharge |
17.7 m3/s |
|
|
RESERVOIR |
||
|
Highest regulated water level |
940 masl |
|
|
Lowest regulated water level |
890 masl |
|
|
Sediment flushing level |
855 masl |
|
|
Live storage |
137 million m3 |
|
|
Dead storage (& sediment flushing) |
20 million m3 |
|
|
Tailwater elevation |
606.5 masl |
|
|
Maximum gross head from full supply level |
333.5 m |
|
|
Design turbine discharge |
222 m3/s |
|
|
Minimum environmental release |
2.51 m3/s |
|
|
Length of reservoir |
15.7 km |
|
|
INSTALLED CAPACITY AND ENERGY PRODUCTION |
||
|
Turbine number and type |
4 units vertical axis Francis turbine |
|
|
Rated unit output |
162.5 MW |
|
|
Energy dry season, peak |
477 GWh |
|
|
Energy wet season, peak |
946 GWh |
|
|
Energy dry season, off-peak |
- |
|
|
Energy wet season, off-peak |
921 GWh |
|
|
Energy, total annual |
2,340 GWh |
|
|
HEADWORKS |
||
|
Dam Location |
Latitude: 270 38’ 37” N Longitude: 860 05’ 11” E |
|
|
Dam height (from river bed) |
96 m |
|
|
Dam height (above deepest foundation level) |
120-135 m |
|
|
Dam type |
Modified RCC |
|
|
Crest length |
350 m |
|
|
HEADRACE TUNNEL |
||
|
Type |
Pressure tunnel, concrete lined |
|
|
Tunnel inlet elevation (after dam intake shafts) |
860 masl |
|
|
Adit tunnels, length |
3,045 m |
|
|
Tunnel length |
17,306 m |
|
|
Excavated Span of tunnel |
9.0 m, horse-shoe shape with higher curvature Invert |
|
|
Powerhouse complex |
"Underground cavern for transformer, switchgear, machine hall and draft tube gates" |
|
|
TAILRACE TUNNEL |
||
|
Type |
Low pressure tunnel, concrete lined |
|
|
Length |
4500 m |
|
|
Diameter (Inverted D shaped) |
9.0 m |
|