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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

 


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