Pamba Basin Hydro Electric Projects

SABARIGIRI HYDRO ELECTRIC PROJECT
Sabarigiri Hydro Electric Project (IHEP) is the second largest hydro electric project in Kerala. The project was commissioned in 1966 with an installed capacity of 300 MW. The RMU of the Project was undertaken during the period from 2005 to 2009, increasing the installed capacity to 340 MW.
THE RESERVOIR
Two reservoirs contribute the water required for operation of the project.
PAMBA RESERVOIR
This reservoir is formed by the Pamda dam constructed across Pamba river. The water from this reservoir is flowing to the Kakki reservoir through an underground tunnel of length 3.21 km.
Water Spread Area
Catchment Area 90.88 Sq. Km.
Average Rainfall 4572 mm
Full Reservoir Level (FRL) 3236 Ft (Above MSL)
Minimum Drawdown level (MDDL) 3160 Ft (Above MSL)
Effective Storage at FRL 31.45 MCM
KAKKI RESERVOIR
This reservoir is formed by construction of a dam across Kakki river. The water received from the Pamba reservoir and the rainfall received in its own catchment area form the water resource of this reservoir. The intake of the Powerhouse is from this reservoir.
Water Spread Area 17.6 Sq. Km.
Catchment Area 225.51 Sq. Km.
Average Rainfall 4572 mm
Full Reservoir Level (FRL) 3220 Ft (Above MSL)
Minimum Drawdown level (MDDL) 3135 Ft (Above MSL)
Effective Storage at FRL 447.76 MCM
Energy Equivalent at FRL 722.2 MU
Average head at power house 2499 ft
SABARIGIRI POWER STATION
The Power Station was commissioned during 1966 -67 with six generators having vertical shaft pelton turbine as the prime mover. After power generation, water from the power station is released to the Moozhiyar reservoir .
Location of the powerhouse
Place Moozhiyar
Village Seethathode
Taluk Ranni
District Pathanamthitta
Before Renovation ,Modernisation & Uprating (RMU) works
Installed capacity 300 MW
Prime mover       vertical shaft pelton turbine
Date of commissioning of the units
Unit Rating Date of Commssioning
U # 1 50 MW 18.04.1966
U # 2 50 MW 14.06.1966
U # 3 50 MW 29.12.1966
U # 4 50 MW 22.06.1967
U # 5 50 MW 09.09.1967
U # 6 50 MW 26.11.1967
RMU works were undertaken in the Power Station from 2005 to 2009 . During renovation work unit No. 4 was also up rated to 55 MW and put into servoice on 11-2-2007. In a fire accident that happened 16-5-2008, unit No 4 was completely desrtroyed. The whole machine parts were dismantled and new machine was erected with an enhanced capacity of 60 MW on 6-5-2014 The unit No 4 Capacity of units 4 and 6 were enhanced by 10 MW each and all other units were enhanced by 5 MW. Thus the total installed capacity of the station is 340 MW. The new capacity rating and commissioning dates of renovated units are as below
After Renovation & modernisation & Uprating (RMU) works
Installed capacity 340 MW
Firm annual generation capability 1338 MU
Unit Rating Date of Commssioning
U # 1 55 MW 03.12.2009
U # 2 55 MW 07.02.2009
U # 3 55 MW 17.03.2008
U # 4 60 MW 06.05.2014
U # 5 55 MW 05.05.2006
U # 6 60 MW 01.07.2005
Power evacuation: The power generated in the station is evacuated using six 220 kV feeders including the interstate Moozhiyar -Theni feeder.
Generation in MU for the last Five years
Year 2009-10 2010-11 2011-12 2012-13 2013-14 2014-15
Genearion in Mu 1402.39 1372.63 1434.71 862.34 1635.44 1224.84
KAKKAD HYDRO ELECTRIC PROJECT
Kakkad Hydro electric Project is the second stage development of Pamba river basin. The installed capacity is 50 MW (2 x 25MW). This scheme utilises the tail race water from Sabarigiri power station and flow received from moozhiyar and velluthode rivers. Two dams feed water to the powerhouse. The Moozhiyar Dam creates the main reservoir of this project. the second reservoir is formed by the Veluthodu dam, constructed across velluthode river.After power generation, water from Kakkad power station is released to the Kakkad River. This water is used for power generation at Ullumkal Power station ( IPP ) & Karikkayam Power station and flows into the Maniyar reservoir owned by Kerala Irrigation Department for power generation in the Maniyar power station, operated by M/s Carborandum Universal Ltd.
MOOZHIYAR RESERVOIR
Water Spread Area 0.1457 Sq. Km.
Full Reservoir Level (FRL) 192.63 m
Minimum Drawdown level (MDDL) 181.36 m
Effective Storage at FRL 1.16 MCM
Energy Equivalent at FRL 0.367 MU
Average head at power house 132.6 m
VELUTHODE RESERVOIR
Water Spread Area 0.0635 Sq. Km.
Full Reservoir Level (FRL) 192 m
Minimum Drawdown level (MDDL) 186 m
Effective Storage at FRL 0.607 MCM
Energy Equivalent at FRL 0.187 MU
The location of the powerhouse :
Place       Seethathode
Village       Seethathode
Taluk       Ranni
District       Pathanamthitta
Installed capacity 50 MW
Firm annual generation capability 262 MU
Prime mover     vertical shaft francis Turbine  
Unit Rating Date of Commssioning
U # 1 25 MW 09.07.1999
U # 2 25 MW 16.07.1999
Power evacuation: The power generated in the station is evacuated using two110 kV feeders and two 11 kV feeders .
Generation from Kakkad for the last Six years        
Year 2009-10 2010-11 2011-12 2012-13 2013-14 2014-15
Genearion in Mu 224.16 224.42 231.53 140.46 247.64 192.93
RANNI PERINAD SMALL HYDRO ELECTRIC PROJECT
This project is a tailrace scheme to the Maniyar project, operated by M/s Carborandum Universal. Tail race discharge after power generation, water from the power station is released to the Pamba River.
Catchment Area     288.283 Sq. Km.
(8.283 sqkm free catchment plus 280 sqkm catchment of maniyar Project)
Location
Place     Mampara
Panchayath     Ranni Perunad
Taluk     Ranni
District     Pathanamthitta
Installed Capacity   4 MW (2 x 2 MW)
Annual generation potential 16.73 MU
Prime mover     Horizontal shaft Kaplan Turbine    
Average head at power house 6.3 m
Unit Rating Date of Commssioning
U # 1 2 MW 16.02.2012
U # 2 2 MW 16.02.2012
Power evacuation: The Power generated in the station is at 3.3 kV which is stepped up to 11 kV and transmitted to 33 kV substation, Perinad.
Generation in Mu for the last three years from Ranni - Perinad Power sation
Year 2011-12 2012-13 2013-14 2014-15
Genearion in Mu 0.21 6.15 9.09 7.35