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 / 18.7941722°S 48.6193028°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 / 18.8033889°S 48.6555639°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) |
Fire
editOn 02 January 2022 a fire broke out in its power plant. This caused many black-outs in Antananarivo and its surroundings. The power units will be again functional around mid-June 2022.[10]
Video
editReferences
edit- ^ "Andekaleka Hydroelectric Project" (PDF). World Bank. 18 May 1978. Retrieved 18 March 2014.
- ^ Humphries, R. W. (1985). "Underground design at Andekaleka Hydroelectric Development". Canadian Geotechnical Journal. 22: 25–31. doi:10.1139/t85-004.
- ^ "Andekaleka Hydroelectric Project Completion Report" (PDF). World Bank. 27 December 1991. Retrieved 18 March 2014.
- ^ "Inventaire du parc hydroélectrique existant - Juin 2013" (in French). ORE. June 2013. Archived from the original on 2014-03-18. Retrieved 18 March 2014.
- ^ "Harbin Electric".
- ^ "Small HydroResource Mapping in Madagascar INCEPTION REPORT" (PDF). World Bank. August 2014. Retrieved 17 June 2020.
- ^ "How Francis Turbines Work (Hydropower) in 3D". YouTube.
- ^ "Francis Turbine Virtual Tour - SolidWorks 3D CAD". YouTube.
- ^ "Francis Water Head Requirement". YouTube.
- ^ "midi-madagasikara.mg Electricité de la Jirama". Archived from the original on 2022-08-07. Retrieved 2022-06-12.
