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Lower Meenmutty Small Hydro Electric Project

Capacity - 2x1.5MW+1x0.5 MW=3.5 MW

Lower Meenmutty Small Hydroelectric Project is a run-of-river scheme in river Kallar of Vamanapuram basin in Thiruvananthapuram district in Kerala State. The project was officially commissioned on 25-03-2006. The project with an installed capacity of 3.5 MW and a designed generation capacity of 7.6 MU per annum. After power generation, water from the power station is released to the Vamanapuram River.

Salient Features

Location: Lower Meenmutty, Thiruvananthapuram
Category: Hydro Power Project
Capacity: 3.5 MW
River: Kallar
Dam: Lower Meenmutty
Annual Energy Potential: 7.63 MU
Generation per MCM: 0.028 MU
Design Discharge through Machine: 4.98 m3/s (Unit-1), 14.98 m3/s (Unit-2,3)
Design Head: 13 m
Design PLF (%): 30


Catchment Area                              102.4 sqm (39.54 sq mile)         
Full Reservoir Level (FRL)              205.87 ft (62.75 m)         
Min. Draw Down Level (MDDL)      201.12 ft                                     

Date of commissioning before renovation

Unit                             Rating                          Date of Commissioning 

Unit -1                          0.5 MW                              28.04.2006
Unit -2                          1.5 MW                              27.04.2006
Unit -3                          1.5 MW                              25.03.2006



a) Type: S type Horizontal shaft full Kaplan
b) Make: M/s VA TECH HYDRO
c) Design Net Head: 13 m
d) Rated output: 0.5 MW, 1.5 MW
e) Output Max./Min: 0.5 MW/0.2 MW, 1.575 MW/0.75 MW
f) Normal Speed: 500 rpm (Unit-1), 333.3 rpm (Unit-2,3)
g) Runaway Speed: 1700 rpm (Unit-1), 1030 rpm (Unit-2,3)
h) Discharge through Machine: 4.98 m3/s (Unit-1), 14.98 m3/s (Unit-2,3)


Features                                     Unit-1                                       Unit – 2,3                   

a) Type                            WD 125 (Horizontal Type)         WD 140 (Horizontal Type)
b) Make                           M/s. TD Power Systems Ltd        M/s. TD Power Systems Ltd   
C) Rated Voltage (V):                3300                                  33000                      
d) Rated Output (kVA):              555.6                                 1667                  
e) Speed (rpm)                          500                                     750                  
f) Power factor:                          0.9                                      0.9                   


a) Type                               ONAN                         
b) Make                              M/s. EMCO Ltd                                    
C) Rated Voltage (V):         3300/11000                    
d) Rated Output (kVA):       5000 
4. Power Evacuation

11 kV Meenmutty Feeder


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