Andekaleka Dam

The Andekaleka Dam is a gravity dam on the Vohitra river near Andekaleka in eastern Madagascar. The primary purpose of the dam is hydroelectric power generation and it diverts water from the Vohitra east into a 4 kilometres (2.5 mi) headrace tunnel where it reaches a 91 megawatts (122,000 hp) underground power station. After water charges the turbine-generators, it travels down a 500 metres (1,600 ft) tailrace tunnel before it reenters the Vohitra River. The drop in elevation between the dam and power station affords a hydraulic head of 235 metres (771 ft).[1][2] The dam and power station were funded by the World Bank at a cost of US$142.1 million. It was constructed between 1978 and 1982.[3] The power station can house up to four generators. The first two were operational in 1982 and a third in 2012.[4] Generator one and two host Vevey and Jeumont turbines while the third is made by HEC.[5][6] They all use Francis reaction turbines [7] which typically range from 10 to 700MW [8] and with water head operating from 10 to 600 meters [9]

Andekaleka Dam
Location of Andekaleka Dam in Madagascar
Country	Madagascar
Location	Andekaleka, Analamanga Region
Coordinates	18°47′39.02″S 48°37′09.49″E
Purpose	Power
Status	Operational
Construction began	1978
Opening date	1982
Construction cost	US$142.1 million
Owner(s)	Jirama
Dam and spillways
Type of dam	Gravity
Impounds	Vohitra River
Height	10 m (33 ft)
Length	125 m (410 ft)
Andekaleka Hydroelectric Power Station
Coordinates	18°48′12.20″S 48°39′20.03″E
Commission date	1982, 2012
Hydraulic head	235 m (771 ft)
Turbines	2 x 29 MW (39,000 hp), 1 x 33 MW (44,000 hp) Francis-type
Installed capacity	91 MW (122,000 hp)