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Paudital Lassa Hydro Electric Project 24 MW
LOCATION
1 State Himachal Pradesh.
2 District Shimla
3 River Pabbar River.
4 Village Paudital-Lassa
5 Nearest Airport Shimla Airport.
6 Nearest Railway station NG-Kalka
7 Nearest capital cities (Across Road) Shimla, Theog, Rohru
8 Diversion Barrage  
  a) Longitude E 77º 43’ 0”
  b) Latitude N 31º 07’30”
Purpose of the Project
1 Purpose of the Project Generation and Transmission of Hydro Electric Power.
Installed Capacity
1 Installed Capacity 3 x 8000 kW
Annual Energy Generation in Mu in 75%Dependable year
1 Annual Energy Generation in Mu in 75%Dependable year 134.95 GWHr
Hydrology
1 Catchment Area 900.00 Sq km2
2 Design Power Discharge 13.55 cumecs / Unit, at rated head
3 Maximum Power Discharge 16.93 cumecs / Unit
4 Design Flood 3000 cumecs
Diversion Structure
1 Location Across Pabbar River near Paudital village.
2 Type Trench Weir
3 FRL EL 1492.50m
4 Deepest Foundation level EL 1482.15 m
5 Deepest River bed level EL 1490.00 m
6 Height of the Trench Weir at deepest bed level 10.85 m
7 Length of Weir 104.00 m
8 Flood discharge capacity 3000 cumecs
9 Gate  
  (a) Service Gate  
  Nos. 1
  Size 5.00 m x 4.0 m
  Hoist Rope Drum Hoist
Intake
1 No 1
2 Sill Level EL.1484.20 m
3 Hoist Bridge Level EL.1502.00 m
4 Design Discharge for three units including flushing 61.00 cumecs
5 Gates  
  a) Service Gate  
  Nos. 2
  Size 3.0 m x 4.1 m
  Type Vertical lift roller Gate
  Hoist Rope Drum Hoist
Power Channel (from CH :24.57 m to 41.57)
1 Length of Channel 17.00 m
2 Size of Channel 7.5 x 11.60 m
3 Bed gradient of channel 1 : 2500
Power Channel (from CH :177.59 m to 184.93)
1 Length of Channel 7.34 m
2 Size of Channel 7.5 x 11.60 m
3 Bed gradient of channel 1 : 2500
Desander
1 Length of Desander including transition, inlet and outlet and gates. 136.00 m
2 Width of gated structure 7.5 m
3 Width of each bay 10.0 m
4 Total width of Desander including bifurcation wall 23.00 m
5 No. of bays 2
6 Sill level of inlet gate EL 1488.39 m
7 Sill level at exit gate EL 1488.35 m
8 Top level at Desander EL 1500.00 m
9 Size of inlet gates 3.25 m x 4.10 m
10 Type Vertical lift roller Gate
11 Hoist Rope Drum Hoist
12 Size of outlet gates 3.25 m x 4.14 m
13 Hoist Rope Drum Hoist
14 Sill level at inlet of Flushing Duct EL.1482.98 m
15 Sill level at outlet of Flushing Duct EL.1481.84 m
Head Race Tunnel
1 Diameter of Tunnel 5.0 m
2 Shape of Tunnel Horse Shoe shape
3 Lining thickness 0.25m
4 Length of the Tunnel 5752.00 m
5 Design Discharge 50.81 Cumecs
Adits
1 Total No. of Adits 2
  Adit 1  
  Length of the Adit 296.40 m
  Dia of Adit 4.0 m “D” shaped
  Adit 2  
  Length of the Adit 282.00 m
  Dia. of Adit 4.0 m “D” shaped
Surge Shaft
1 Diameter of Surge Shaft 15.0 m
2 Invert level 1453.33 m
3 Sill level at inlet 1454.90 m
4 Top Level EL.1507.00 m
5 Maximum Surge Level EL.1506.00 m
6 Minimum Surge Level EL.1462.00 m
7 Height of the Surge shaft 53.67 m
8 Type of Construction RCC lined
Main Penstock
1 Type Tunnel penstock
2 Shape Circular
3 Diameter 5.0m dia for a length of 72.9 m
4 Surface Penstock 4.0m dia for a length of 55.86 m
5 Flow Pressure Flow.
Power House
1 Location Left bank of Pabber River.
2 Type Surface
3 Size of Power house (including Service Bay) 21.50 m x 40.10 m
4 Size of Service Bay 21.50 m x 10.00m
5 Size of Unit Bay 15.00 m X 30.10 m
6 Size of Control room / Switch gear room. 6.50 m x 30.10 m
7 No. of Bays 3 unit bays and one Service bay
8 Capacity 3 Units of 8000 kW each
9 El. Of Turbine C/L El 1417.20 m
10 Generator Floor Level El 1419.80 m
11 Control Room Floor Level El 1427.50 m
12 Service/Equipment handling Bay Level El 1427.50 m
13 Draft Tube floor Level El 1412.77 m
  a) Draft Tube Gates  
  No. of gates 3 Nos.
  Size of gates 5.00 m x 2.00m
  Type Vertical lift Gate
  Hoisting Arrangement Moving Gantry Crane.
Tail Race Pool
1 Length 23.12 m22
2 High Flood Level EL 1426.50
3 Bed width Varing from 29.63m to 25.00m.
4 Design discharge 50.81 Cumecs
5 Bed Slope 1 in 4
6 Bed Levels Varying from EL 1412.77m to EL 1418.55m.
Tail Race Channel
1 Length 600.00 m
2 Bed Width 25.00 m
3 Type Unlined, Regraded.
4 Longitudinal slope 1 in 1000
5 Bed Levels Varying from EL 1418.55m to EL 1417.95.
Turbines
1 Type Vertical Francis Turbine
2 Rated Capacity of the turbine 8333 kW
3 Maximum Net Head 73.83m
4 Minimum Net Head 66.83 m
5 Rated Head 68.41 m
6 Rated Discharge Per unit 13.55 Cumecs
7 Rated Speed 375 rpm
8 Runner Dia. 1500 mm
9 Efficiency 92 %
Generators
1 Type Synchronous Generator
2 Rated Output 8000 kW
3 Generation Voltage 11kV
4 Rated Speed 375 rpm
5 Efficiency - Generator 96%
Transmission Lines
1 Length 12 km
2 Terminal Point 66/22 kV HPSEB at Rohru
3 Type 66 kV Double Circuit
Out Door Yard
1 Size 46.00 m x 29.00 m
2 No. of Power Transformers 3
Implementation Period
1 Implementation Period 36 Months
Financial Aspects
1 Basic Cost as per DPR Rs 16,189.00 Lakhs
2 Escalation during Construction Rs 853.43 Lakhs
3 Financial charges Rs 58.64 Lakhs
4 IDC Rs 2074.11 Lakhs
5 LADC Charges Rs 48.82 Lakhs
6 Total on Completion Rs 19,547.00 Lakhs
7 Total Equity Rs 5864.00 Lakhs
8 Loans from Financial Institutions Rs 13,683.00 Lakhs
 

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