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 Idukki district in the state of Kerala, India. 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. At 168.91 metres (554.2 ft), it is one of the highest arch dams in Asia. The Indo-Canadian project was inaugurated by the Prime Minister Indira Gandhi on February 17, 1976.
Mattupetty Dam, near Munnar in Idukki District, is a storage concrete gravity dam built in the mountains of Kerala, India to conserve water for hydroelectricity. It has been a vital source of power and huge revenue for Idukki District. The large amount of perennially available water allows wild animals and birds to flourish. Construction of the dam was led by E.U. Philipose, Superintending Engineer, Kerala State Electricity Board. The height of the dam is 83.35 metres (273.5 ft) and the length is 237.74 metres (780.0 ft). Taluks through which the release flows are Udumpanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.
The Ponmudi Dam is a concrete gravity dam built across the Panniyar river which is a tributary of Periyar river at Konnathady panchayath of Konnathadi village in Idukki district of Kerala, India. The dam was constructed in 1963 as a part of a hydroelectric project. Construction was led by E.U.Philipose, Superintending Engineer, Kerala State Electricity Board. It has a length of 288.80 metres (947.5 ft). The hydropower component of the dam has an installed capacity of 30 MW with firm power of 17 MW, generating 158 GWh annually. Taluks through which the river flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.
Malankara dam is a gravity dam constructed across Thodupuzha river for irrigation purposes. The dam is constructed to make use of the tail water from the Moolamattom power house. The project is run under the Muvattupuzha Valley Irrigation Project and KSEB. The artificial lake covers an area of around 11 square km.
The Lower Periyar Dam is a dam built on the Periyar River as part of the Lower Periyar Hydroelectric Project in Kanjikuzhi Panchayat, Idukki District, Kerala. The dam was built to generate electricity. The lower Periyar dam is at Pambla, five kilometres downstream from where Muthirapuzha merges with main river. This 32.36-metre-high dam made of concrete has a width of 284 meters. The powerhouse is at Karimanal, near Neriamangalam, where three generators are installed with a power production capacity of 60 MW each, or a cumulative 180 MW. The Dam was completed in the year 1998 Taluks through which release flow are Idukki, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.
Azhutha Dam is a small diversion dam built on the Azhutha River which is a tributary of the Pamba River, at Azhutha in Peerumed Grama Panchayat of Idukki District, Kerala, India. It is a small concrete gravity dam that is only 72 metres (236 ft) long and 14 metres (46 ft) high. It acts mainly as a diversion dam to supply water to the Idukki Dam. The Azhutha Dam was constructed as an augmentation dam for the Idukki Hydro Electric Project. Construction of the project started in 1987 and was expected to be commissioned in 1991, but the project overrun and was only partially commissioned in June 1998. The year of completion was 2007. The release of the water from the dam is to Azhutha river and it flows through Ranni and Ayroor taluks.
Erattayar Dam is a small, diversion dam built on the Erattayar river in Erattayar grama panchayat near Kattappana town in Idukki district of Kerala, India. It acts mainly as a diversion dam to supply water to the Idukki dam. Diversion of water from Erattayar forebay to Idukki reservoir is through a tunnel called Anchuruli tunnel which is 3.77 km (2.34 mi) long. Construction of the dam was completed in the year 1989.
Kallar Dam is a small, diversion dam constructed at Perinjamkutty river in Nedumkandam grama panchayat of Idukki district, Kerala, India. It acts mainly as a diversion dam to supply water to the Idukki dam.
Kallarkutty Dam is a gravity dam built on the Muthirapuzha river, a tributary of the Periyar river, as part of the Neriamangalam Hydroelectric Project at Kallarkutty in Vellathooval panchayat of Idukki district in Kerala, India. The water discharged from the Chenkulam dam's powerhouse and the Muthirapuzha river is diverted to the Neriamangalam powerhouse near Panamkutty above the Pambla dam. The Hydroelectric Project was commissioned on 27 January 1961 to generate 45 MW of power using 3 turbines with a capacity of 15 MW. In 2006, the project was upgraded from 45 MW to 52.65 MW. Taluks through which release flow are Udumbanchola, Devikulam, Idukki, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur. The Project was led by Kerala State Electricity Board Engineer E.U. Philipose
Kundala Dam, also known as Setuparvatipuram Dam, is a masonry gravity dam built on Muthirapuzha River in Mattupetty panchayat of Idukki district in Kerala, India. It is part of the Pallivasal Hydroelectric Project, the first hydroelectric project in Kerala. The dam is considered to be Asia's first arch dam. It has a height of 46.93 m (154.0 ft) and length of 259.38 m (851.0 ft). Release from dam is to river Palar and taluks through which release flow are Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungalloor and Paravur.
Chenkulam Dam is a gravity dam located on the Muthirapuzha river in Vellathooval panchayat of Idukki district in the Indian state of Kerala. It spans 144.50 metres (474.1 ft) long and stands 26.82 metres (88.0 ft). It hosts a 48 MW power plant.
Vellathooval Dam is a diversion dam built on the Muthirappuzha river in Vellathooval village in Devikulam taluk of Idukki district in Kerala, India. The height of the dam from the deepest foundation is 16 metres (52 ft) and length is 75 metres (246 ft). Water from the Sengulam Power House and from the Muthirapuzha river gets released to the Vellathooval dam. Water from this dam is diverted through a canal system to the powerhouse near Panniyar After the water flow is used to generate hydroelectricity, the water is released back into the river. The dam is one of the major tourist attractions in the Idukki District, Kerala.
R. A. Headworks or Ramaswamy Aiyar Headworks is a masonry type weir situated in Munnar panchayath of Munnar village in Idukki district of Kerala, India impounding mudirapuzha river. It is also called as Munnar Headworks. It is a part of Pallivasal Hydro Electric Project, the first hydro power project of Kerala State. There are two dams and one diversion weir as part of this project. These are Kundala Dam, Maduppetty Dam and R. A. Head works.
Viripara Weir is a Diversion weir constructed across Upper Kallar river which is a tributary of Pooyankutty river in Mankulam village of Idukki district in Kerala, India. The water flows from the dam to Menachery river and flows through the taluk of Devikulam. The Viripara weir is constructed as an augmentation scheme to Neriamangalam Hydro Electric Project. Upper Kallar, a tributary of Pooyankutty river is diverted in to Kallarkutty reservoir by a low diversion weir at Viripara along with a short diversion tunnel.
Vazhikadavu Weir is a diversion dam of concrete gravity type constructed across Meenachil River at Teekoy Village in Kottayam District in Kerala, India. The Vazhikkadavu weir is constructed as an augmentation scheme to Idukki HEP. The dam has a height of 10.20 metres (33.5 ft) from the deepest foundation and a length of 58 metres (190 ft).
Narakakkanam Weir is a diversion dam constructed across Narakakkanam River in Mariyapuram panchayath of Thankamani Village in Idukki district in Kerala, India. Narakakkanam weir is an augmentation weir for the Idukki Hydro Electric Project. Narakakkanam, Azhutha, Vazhikkadavu, Vadakkepuzha and Kuttiar diversion schemes were later added to augment the Idukki reservoir. The height of the dam is 11.50 metres (37.7 ft) from the deepest foundation and length is 45.20 metres (148.3 ft).
Vadakkepuzha Weir is a diversion dam of Earthen type constructed across Vadakkepuzha which is a tributary of Muvattupuzha river in Arakkulam village in Idukki district of Kerala, India. Vadakkepuzha weir is a part of an augmentation scheme for the Idukki Hydro Electric Project. Narakakkanam, Azhutha, Vazhikkadavu, Vadakkepuzha and Kuttiar diversion schemes were later added to Idukki HEP to augment the reservoir. Water from the reservoir is pumped in to Idukki reservoir through a pump house with three pumps.
Kulamavu Saddle Dam (Near Junction) is one of the two saddle dams of Idukki Reservoir constructed across Kilivallithodu River which is a tributary of Periyar river at Arakkulam village in Idukki District of Kerala, India. It is a Rolled Earth filled dam with a height of 18.29 metres (60.0 ft) and a Length of 457.2 metres (1,500 ft). The road to Idukki from Thodupuzha passes over this saddle dam.
Kulamavu Saddle Dam (RIght Bank) is an Earthen Dam constructed across Kilivallithodu at Arakkulam village in Idukki District of Kerala, India. It is One of the two saddle dams constructed to augment Idukki reservoir. The dam has a height of 27.43 metres (90.0 ft) and a length of 384.96 metres (1,263.0 ft). It is a rolled earth filled dam which has no Spillways or river outlets
The Moolamattom hydro power station is the power house of the Kerala State Electricity Board's Idukki Hydroelectric Project, the largest hydroelectric project in Kerala, India, with a capacity to generate 2398 million units of electricity annually. Located at Moolamattam in Arakulam Gram Panchayat of Thodupuzha Taluk of Idukki district, it is one of the largest underground hydroelectric power stations in India. The power house has an installed capacity of 780 MW. In the three dams of this hydroelectric project, the water needed to generate electricity at the Moolamattam power station is pumped through tunnels near the pond level.
