River(Impounds): Edamalayar/Periyar river
Location: Ernakulam District, Kerala
Opening: 1985
Height: 102.80 metres
Length: 373 metres
Total Capacity: 1.0898 cubic kilometres
HISTORY:
The Idamalayar Dam (Malayalam: ഇടമലയാർ അണക്കെട്ട്) is a multipurpose concrete gravity dam located at Ennakal, near Bhoothathankettu, on the Idamalayar River, a tributary of the Periyar River in Kerala, South India. Completed in 1985, with a length of 373 metres (1,224 ft), the dam created a multipurpose reservoir covering 28.3 km2 (10.9 sq mi) in the scenic hills of the Western Ghats.
The reservoir storage is utilized by a hydroelectric power station which has an installed capacity of 75 MW with two units of 37.5 MW capacity, producing an annual energy output of 380 GW·h.
The large reservoir created by the Idamalayar Dam is operated by the Kerala State Electricity Board to augment its peak power generation requirements. The dam will benefit the Idamalayar Irrigation Development Project by diverting water released from the tail race channel of the Idamalayar power station.