Idukki Arch Dam, Idukki

The Idukki Dam is a double curvature Arch dam constructed across the Periyar River in a narrow gorge between two granite hills locally known as Kuravan and Kurathi in Kerala, India. At 168.91 metres (554.2 ft), it is one of the highest arch dams in Asia. It is constructed and owned by the Kerala State Electricity Board. It supports a 780 MW hydroelectric power station in Moolamattom, which started generating power on 4 October 1975. The dam type is concrete, double curvature parabolic, thin arc dam.

This dam was constructed along with two other dams at Cheruthoni and Kulamavu. Together, the three dams have created an artificial lake that is 60 km2 (23 sq mi) in area. The stored water is used to produce electricity at the Moolamattom Powerhouse, which is located inside nearby rocky caves. The Government of Canada aided in the building of the dam with long term loans and grants.