Idukki Arch Dam

Idukki means a place with a deep gorge. River Periyar flowed through a canyon between two rodky mountains. Kurava and Kurathy. The legend told from generation of the ancient Adivasi Muthuvan tribe here is that Sita, during her forest sojourn with Rama, bathed in th canyon, and on seeing an Adivasi couple - Kuravan and Kurathy watching her naked beauty, she cursed them into two rocky mountains. Modern technology has bridged them at the gorge to form the marvel of Idukki arch dam, the first of its kind in Asia. When a new district was carved out, it shared the place name of the arch dam. This beautiful High range district of Kerala is geographically known for its mountainous hills and dense forests. For the people of Kerala, Idukki is always associated with power generation.

 History of Idukki Arch Dam
The possibility of Hydroelecric development at Idukki was first conceived in 1919. According to history Shri Karuvellayan Kolumban, the head of 'Araya' tribe, during 1922 showed the way, to the Malankara Estate Superintendent and his friend Thomas, the spot of present Arch Dam while the two were hunting in the forest. Thomas was inspired by the sight of the water flow between the mountains and his idea made the dream come true of Idukki Arch Dam. Sri. W.J.John of Malankara Estate submitted a report to the Government of Travancore in 1932 on the possibility of constructing a hydroelectric dam at Idukki.

In 1947 Sri.P.Joseph John,then Chief Electrical Engineer to the Government of Travancore made a preliminary investigation report. On the request of the Government, the Central Water and Power Commission took up detailed investigation in 1956. The project report was prepared in 1961 and the Planning Commission accorded sanction for the scheme in 1963.

The construction of this Dam commenced on 30 April 1969. Storage of water in Idukki reservoir commenced in February,1973. The inauguration of trial run of the first machine was celebrated on 4th October,1975. Commercial operation of the Power Station was Commissioned on 12 February 1976 by the then Prime Minister Smt. Indira Gandhi.

Construction of this Arch Dam and two other dams at Cheruthony and Kulamavu has created an artificial lake of 60 sq. kms. and the water stored, is utilised for production of electricity at the Moolamattom Power house, which is located inside the rocky caves.

The Canadian Government gave financial aid to the Project while M/s S.N.C.Inc., Canada, a well-known firm of Consulting Engineers were advising and assisting Project Engineers under the Canadian Aid. 

Idukki Arch Dam Project

The Project harnesses a major portion of the power potential of Periyar, the largest river in Kerala, by the creation of a reservoir of 2,000 M.cum (2 Billion Tonnes) capacity, diversion of waters thus impounded through a water conductor system consisting of a power tunnel and two underground pressure shafts to an underground power house situated in Muvattupuzha Valley. The installed capacity of the Power House is 780MW consisting of 6 Units of 180 MW each.The regulated waters of Periyar falls through a drop of about 669.2 metres (2195 feet) while generating power in the underground power house.

The tail waters flowing to Kudayathurpuzha through tunnel and open channel is diverted for irrigation purposes in the Muvattupuzha Valley.
Idukki valley is 121 km away from Kottayam, and is a small hill town surrounded by a spread of beautiful, wooden valleys and meandering streams. Idukki is a well known tourist center in Kerala.

The Idukki Wildlife Sanctuary extends over the Thodupuzha and Udumpanchola taluks of Idukki district, spread over 77 sq. km and is about 450 - 748 m above sea level. The Idukki Reservoir formed by three dams - Cheruthoni, Idukki and Kulamavu - extends to 33 sq km. One can find Elephants, bisons, sambars deers, wild dogs, jungle cats, tigers, wild boars etc. and variety of Snakes like Cobra, viper, krait and a number of non poisonous snakes in this Sanctuary. The birds of Idukki are Jungle fowl, myna, laughing thrush, black bulbul, peafowl, woodpecker, kingfisher etcBest Season: August to March

Transport Terminals: Kochi-Madura, N H 49 goes through Idukki district.
Thodupuzha, the major town in the district, is well connected with other parts of the district and the state.

How to Reach: Nearest Railway Station: Kottayam railway station
Nearest Airport: Cochin International Airport