Capacity - 4x55MW+2x60 MW=340 MW
Sabarigiri Hydro Electric Project
The Sabarigiri Hydro Electric Project is the second largest Hydro Electric Project of Kerala state.It is located in Pathanamthitta district of Kerala.This Indo-American project was commissioned on 28th August 1967 by His Excellency then President of India Sri.V.V.Giri. There are two main reservoirs under Sabarigiri HEP scheme namely Kakki and Pamba reservoir. Both these reservoirs are interconnected through underground tunnel. The Kakki reservoir consists of two dams namely, Kakki dam and Anathode dam. The Kakki dam is a concrete gravity dam on Kakki river. Anathode dam is a small dam located on a river which is a tributary of Kakki river. Small augmentation reservoirs viz Kullar-Gavi, Meenar I & Meenar II are serially connected to Pamba reservoir and also Upper Moozhiyar augmenting flow to Kakki reservoir.The power house of Sabarigiri HEP receives water from Kakki dam through a tunnel and discharges into Moozhiyar dam with an installed capacity of 340 MW.The power house consists of four generators of 55 MW and two generators of 60 MW.
The tail race water released from Sabarigiri power house is further utilised to generate hydropower at 5 different power Houses in the downstream side as given below:
1. Kakkad Power house
2. Ullumkal Power house
3. Karikkayam Power house
4. Carborandom HEP
5. Ranni-Perinad Power house.
Maniyar dam is located further downstream and is used for Pamba irrigation project.
The Power generated in Sabarigiri HEP is evacuated using six 220 kV feeders including interstate Sabarigiri-Theni feeder and one 66 kV feeder.
Salient Features
Location: Moozhiyar, Pathanamthitta
Category: Hydro Power Project
Capacity: 340 MW
River : Pamba
Dam: Pamba, Kakki
Annual Energy Potential : 1338 MU
Generation per MCM: 1.6129 MU
Design Discharge through Machine: 8.806 m3/s
Design Head: 714.76 m
Design PLF (%) : 51
Features Pamba Reservoir Kakki Reservoir
Catchment Area : 90.8 sqkm (30.06 sq mile) 225.33 sqkm (87 sq mile)
Gross Storage : 39 MCM 454.2 MCM
Full Reservoir Level (FRL) : 3235.99 ft (986.33 m) 3220.01 ft (981.46 m)
Min. Draw Down Level (MDDL) : 3160 ft 2980 ft
Date of commissioning before renovation
Unit Rating Date of commissioning
Unit -1 50 MW 18.04.1966
Unit -2 50 MW 14.06.1966
Unit -3 50 MW 29.12.1966
Unit -4 50 MW 22.06.1967
Unit -5 50 MW 17.10.1967
Unit -6 50 MW 25.11.1967
Date of commissioning after renovation
Unit Rating Date of commissioning
Unit -1 55 MW 03.12.2009
Unit -2 55 MW 07.02.2009
Unit -3 55 MW 16.03.2008
Unit -4 55 MW 11.02.2007
60 MW 06.05.2014
Unit -5 55 MW 04.05.2006
Unit -6 60 MW 01.07.2005
Technical
1. TURBINE
a) Type: Vertical shaft 4 jet impulse type Pelton wheel turbine
b) Make: M/s VA TECH HYDRO (Unit-1,2,3,5,6) & M/s HARBIN(KUNMING) ELECTRIC MACHINERY CO.Ltd (Unit-4)
c) Design Net Head: 714.76 m
d) Rated output: 55 MW, 60 MW
e) Output Max./Min:55 MW/20 MW, 60 MW/20 MW
f) Normal Speed: 500 rpm
g) Runaway Speed: 885 rpm
h) Discharge through Machine: 8.806 m3/s
2. GENERATOR
Features Unit-1,2,3,5 Unit – 4 Unit-6
a) Type: Salient Pole Synchronous Generator
b) Make: M/s. Allis Chalmers M/s. Puissance De'Leau M/s. Allis Chalmers
C) Rated Voltage (V): 11000 11000 11000
d) Rated Output (kVA): 55000 60000 60000
e) Speed (rpm): 500 500 500
f) Power factor: 0.9 0.9 0.9
3. GENERATOR Transformers
Transformers -1,2,3,5 Transformer -4 Transformer -6
a) Type: WFOCB OFWF WFOCB
b) Make: TELK Crompton Greaves TELK
C) Rated Voltage (V): 11000/220000 11000/220000 11000/220000
d) Rated Output (kVA): 22000x3 25000x3 25000x3
4. Power Evacuation
1. 220 kV Sabarigiri Brahmapuram Feeder
2. 220 kV Sabarigiri Pallom Feeder
3. 220 kV Sabarigiri Edamon 1 Feeder
4. 220 kV Sabarigiri Edamon 2 Feeder
5. 220 kV Sabarigiri Edamon 3 Feeder
6. 220 kV Sabarigiri Theni Feeder
7. 66 kV Sabarigiri Kochupamba