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
CountryMadagascar
LocationAndekaleka, Analamanga Region
Coordinates18°47′39.02″S 48°37′09.49″E
PurposePower
StatusOperational
Construction began1978
Opening date1982
Construction costUS$142.1 million
Owner(s)Jirama
Dam and spillways
Type of damGravity
ImpoundsVohitra River
Height10 m (33 ft)
Length125 m (410 ft)
Andekaleka Hydroelectric Power Station
Coordinates18°48′12.20″S 48°39′20.03″E
Commission date1982, 2012
Hydraulic head235 m (771 ft)
Turbines2 x 29 MW (39,000 hp), 1 x 33 MW (44,000 hp) Francis-type
Installed capacity91 MW (122,000 hp)

References
  1. "Andekaleka Hydroelectric Project" (PDF). World Bank. 18 May 1978. Retrieved 18 March 2014.
  2. Humphries, R. W. (1985). "Underground design at Andekaleka Hydroelectric Development". Canadian Geotechnical Journal. 22: 25–31. doi:10.1139/t85-004.
  3. "Andekaleka Hydroelectric Project Completion Report" (PDF). World Bank. 27 December 1991. Retrieved 18 March 2014.
  4. "Inventaire du parc hydroélectrique existant - Juin 2013" (in French). ORE. June 2013. Archived from the original on 2014-03-18. Retrieved 18 March 2014.
  5. "Harbin Electric".
  6. "Small HydroResource Mapping in Madagascar INCEPTION REPORT" (PDF). World Bank. August 2014. Retrieved 17 June 2020.
  7. "How Francis Turbines Work (Hydropower) in 3D".
  8. "Francis Turbine Virtual Tour - SolidWorks 3D CAD".
  9. "Francis Water Head Requirement".
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