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About Construction Company

S.J.V.N. Limited (SJVN), a Central Public Sector Undertaking (CPSU) under the Ministry of Power, Covt. of India is a joint venture between the Government of India and the Government of Himachal Pradesh. The present installed capacity of SJVN is 1500 MW. The capacity addition under execution by the corporation is of 2962 MW (412 MW under construction, and 2550 MW under investigation/implementation)

SJVN is the first CPSU to bag a Hydro power Project outside India on open competition basis. SJVN responded as an IPP against international competitive bedding invited by Government of Nepal for Arun-III Hydro Power Project and emerged as a front-runner amongst the companies like. SINOHYDRO Corp. Ltd. & China Overseas Engineering Group Co. Ltd. From China and GMr Enerty Lte., Reliance Energy Ltd., L & T Ltd., MAYTAS Infra Pvt. Ltd., Jindal Steel & Power Ltd., and JP Associates Ltd. from India. After detailed negotiations, the MoU was signed with Govt. of Nepal on 02.03.2008. The above MoU provides for construction on BOOt basis of Arun-III HEP within Seven & half years from the date of signing of MoU inducing Two & half year for detailed survey & investigation and its subsequent operation for thirty years from the date of issue of generation license. The project will generate 2891 MU per year out of which 21% free power shall be given in Govt. of Nepal. The above MoU envisages construction is given below:

Hydrology
Catchment Area : 26747 Km2
90% Dependable year flows : 203 m3/s
Annual average flow : 296 m3/s
Glacier lake outburst flood at dam site : 4000 m3/s
Maximum flood ( 1:10,000) : 5543 m3/s
Probable Maximum Flood (PMF) : 7900 m3/s
Pondage fetch along the river from dam site : 4Km ( Approx.)
Design discharge for generation : 342.23 m3/s
Max. Gross Head : 303.8 m
Max. Net Head at full load : 285.98 m
Installed Capacity : 900 MW
Annual Energy : 4033.52MU
Diversion tunnel
Location : Right Bank
Number and Types : Circular Shaped
Length : 466.0m
Diameter : 11.0m Dia
Design discharge for diversion : 1300 m3/s
Gates : 2 X (5.5X11m)vertical lift fixed wheel
Dam
Type : Concrete gravity dam
Height above deepest Foundation Level: 68 m (EL.781 )
Top of Dam : EL 849 m
Length of Dam : 165.00 m
FRL : EL 845 m
Spillways
Sluice Spillway No. : 6 ( 9.0 m W X 12.5 m H )
Crest Level : EL 808.0 M
Overflow Spillway No. : 1 ( 5.0m W X 5.0 m H)
Crest level : EL 840.0m
Intakes
Number & Type : 4 No’s straight intake with Bell mouth
No of Gates( Size ) : 04 nos., 6.0m dia. Cir &01 (4.8mX6.0m) Moving
Desilting Caverns Emergency Gate
Number & Type : 4 No’s underground
Particle size to be removed : 0.2mm & above (Suspended Sediment)
Cavern dimensions (W/H/L) : 19/24/420m
Flushing tunnel : 4.5m(w)/ 3.6m(h)
Headrace Tunnel
Number & Type : One conc. lined circular pressure tunnel
Length : 11.74 Km
Finished Dia : 9.5 m
Surge Tank- Underground
Number & Type : One, Restricted orifice type
Shaft diameter : 24.00m
Height : 110.00m
Max. Upsurge/Min down surge : EL 863.35/ 826.79
Butterfly Valve Chamber
Type : Underground
Cavern Size : 12/ 21/ 94m
Butterfly Valves : 2 nos, 5.5m dia.
Pressure shaft & U/s manifold
Number & Type : Two vertical pressure shafts dia 5.5m each Bifurcation dia 3.2m
Power House Cavern
Dimension ( W/H/L) : 21/43/217m
No. of generating units : Francis 4 x 225 MW
Centre line of Turbine : EL 525.00 m
Clearances /Events of the project
LAND
A Sum of NPR 45.14 Crores has been paid to GON initially against expenditure made on Arun 3 HPP after signing of MOU, which includes the compensation paid on account of acquisition of land at different locations.
Total land in possession of project=8120ROPopani(4129020sq.m) (5161.275 bighas)
Infra structure works (Dam/Power House)=14-6Ropani(7435 sq.m) (9.294 Bighas)
After complete survey and marking on cadastral maps, the deptt of Survey and Land revenue at Khadbari are in the process of transferring the lal purjas ( Tatima ) in the name of GON, before handing over this land to SJVNL on lease or till project remains in possession of SJVN. Almost 60% of the job completed as informed by local administration.