Salient Technical Features



Concession Period 30 years (commencing at COD)
Design Discharge (Project) 1260 m3/sec
Rated Net Head 61.7 m
Gross Generation at Generator Terminals 3299 GWh
Net Generation 3265.81 GWh (net of auxiliary consumption)
Plant Factor 53.6 %

Power Purchaser

Central Power Purchasing Agency Guarantee Limited


Dam Crest Level 535 m.a.s.l
Crest El. of overflow section 526 m.a.s.l
River Bed level at Dam 450 m.a.s.l
Maximum Reservoir Level at Dam (PMF) 535 m.a.s.l
Maximum flood (PMF) 35,650 m3/sec
Spillway Gates – type 7 nos radial with overspill capacity
Spillway Gates - size Width 14m x Height 20m
Low level Outlet Gates –type 2 No. radial gates
Low level Outlet Gates –size Width 6.75m x Height 8m

Roller Bucket Energy Dissipator - invert level

450 m.a.s.l


Four (04) Tunnels-Overall Lengths 122m/136m/160m/184m
Design discharge (Unit) 315 m3/sec

Headrace / Penstock Diameter



Tunnel length 400 & 495 m
Tunnel width 12.5 m

Tunnel height

14 m


Accommodation Surface loading bay building, underground machine hall. The main transformer is located on the surface near powerhouse entrance.
Surface building (length x width) 40m x 20m
Surface building cranage 1 x OET
Crane capacity 275/25/5 tonnes
Machine Hall (length x width) 170m x 20m
Machine Hall cranage 2 x OET
Crane Capacity 275/25/5 tonnes
Turbine generators installed 4 No.
Type of Turbine, power (each) Francis, 175.175 MW
Speed 111.1 rpm
Discharge max, min (per turbine) 315m3/s, 189 m3/sec

Generator Transformers

Single phase, 12 No.


Tunnel U1 Length 150m. Cross section 8.5m x 9.5m; U shaped
Tunnel U2 Length 184m. Cross section 8.5m x 9.5m; U shaped
Tunnel U3 Length 211 m; Cross Section 9.5 m x 10.5 m; U shaped
Tunnel U4 Length 238 m; Cross Section 9.5 m x 10.5 m; U shaped
Tunnel Discharge Capacity 315 m3/sec
Maximum Tailwater Level with 4 units in operation at rated discharge 461.76 m.a.s.l.
Maximum Tailwater Level with one unit in operation at rated discharge 461.08 m.a.s.l.

Maximum Tailwater Level (PMF)

503 m.a.s.l.


Full Supply Level 526 m.a.s.l.
Reservoir Length ~22 km
Reservoir Area 3.8 km2

Note:All of the above data is based on the Project Feasibility Stage design and the Optimized Feasibility Design as approved by POE of PPIB.

Copyright © 2017 Azad Pattan Power. All Rights Reserved.