Laúca dam

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Laúca dam
The turbine inlets during the construction period
The turbine inlets during the construction period
location
Laúca dam (Angola)
Laúca dam
Coordinates 9 ° 44 '36 "  S , 15 ° 7' 32"  E Coordinates: 9 ° 44 '36 "  S , 15 ° 7' 32"  E
country AngolaAngola Angola
place Malanje Province
Waters Cuanza
Height upstream 850  m
power plant
owner Empresa Nacional de Electricidade (ENE)
operator ENE
construction time 2012 to 2018
Start of operation August 2017
technology
Bottleneck performance I: 2,004 MW
II: 65.5 megawatts
Average
height of fall 		I: 200 m
II: 128 m
Expansion flow I: 1,092 m³ / s
II: 60 m³ / s
Standard work capacity 8,640 million kWh / year
Turbines Francis turbines
I: 6 × 334 MW
II: 1 × 65.5 MW
Others

The Laúca Dam ( Portuguese Barragem de Laúca ) is a dam with hydroelectric power station in the Malanje Province , Angola . It dams the Cuanza , which forms the border between the provinces of Malanje and Cuanza Sul here. The town of Dondo is 82 km downstream. The Capanda dam is 47 km upstream. The Caculo-Cabaça dam is under construction below Laúca .

Construction work began in 2012. They are carried out by the Brazilian company Odebrecht . The power plant was officially inaugurated on August 4, 2017 by the President of the Republic, José Eduardo dos Santos , when the first machine was put into operation. It is owned by the state Empresa Nacional de Electricidade (ENE) and is also operated by ENE.

Barrier structure

The barrier structure consists of a gravity dam made of rolled concrete with a height of 132 (or 156) m. The length of the top of the wall is 1,075 (or 1,100 or 1,242) m. The volume of the structure is 2.64 (or 2.75) million m³.

The dam wall has a flood relief , through which a maximum of 10,020 m³ / s can be discharged. The design flood is 8,239 m³ / s; the probability of this event occurring has been determined to be once in 10,000 years.

On the right side of the river, 2 diversion tunnels (length 450 and 550 m, diameter 14 m) were drilled into the rock in order to be able to discharge the water of the Cuanza during the construction period.

Reservoir

When the reservoir is fully blocked, it extends over an area of ​​188 km² and holds 5.482 billion m³ of water - of which 4.12 billion m³ can be used to generate electricity. The congestion target can fluctuate between 850 and 800 m above sea level , the maximum congestion target is 852 m. The maximum length of the reservoir is 36 km, the maximum width 15 km.

The water flow of the Cuanza in the middle reaches varies according to the season; the lowest water flow is in the dry season (June to November), the highest water flow occurs from March to May. Between 1951 and 1974 a minimum of 122 m³ / s and a maximum of 3,740 m³ / s were measured at Cambambe . The average was 684 m³ / s.

power plant

Laúca I power plant

The power plant has an installed capacity of 2,004 MW . The expected annual production is expected to be 8.64 billion kWh . The power plant's 6 Francis turbines each have a maximum output of 334 MW. The maximum height of fall is 200 m. The flow rate is 182 m³ / s per turbine.

On the right side of the river, 6 tunnels (length 2000 m) were blasted into the rock, leading to the machine hall of the power plant. The machines are located in a cavern (length 277 m, height 52 m, width 22 m). From the cavern, 6 tunnels (length 40 m) direct the water back to the river. The turbines and other electromechanical equipment will be supplied by Andritz AG .

Laúca II power plant

Another power plant (a Francis turbine with 65.5 MW) is being built at the foot of the dam to guarantee a certain minimum flow into the old river bed for ecological reasons. The drop height is 128 m, the flow is 60 m³ / s.

Others

The construction costs of the dam (including the power plant) are around 4.3 billion USD . The additionally required high-voltage lines will also be built by Odebrecht ; the costs for this are given as 780 (or 800) million USD.

See also

Web links

Commons : Laúca dam  - collection of images, videos and audio files

Individual evidence

  1. ↑ a b c A grande Barragem de Laúca. jornaldeangola.sapo.ao, May 3, 2016, accessed August 8, 2016 (Portuguese).
  2. ↑ a b c d Lauca dam, in Angola, starts producing energy in 2017. www.macauhub.com.mo, October 30, 2015, accessed on June 28, 2016 (English).
  3. ↑ ANGOLA - NEW CACULO CABAÇA HYDROPOWER PROJECT IN THE KWANZA RIVER - CONSTRUCTION ABOUT TO BEGIN. (No longer available online.) Www.cobagroup.com, archived from the original on August 19, 2016 ; accessed on August 8, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.cobagroup.com
  4. ↑ CGGC signs contract on Caculo Cabaça Hydropower Project in Angola. (No longer available online.) China Gezhouba Group Corporation (CGGC) June 11, 2015, archived from the original on August 8, 2016 ; accessed on August 8, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.cggc.cc
  5. ↑ PR inaugura barragem de Lauca. www.portaldeangola.com, August 4, 2017, accessed August 6, 2017 (Portuguese).
  6. ↑ a b c d e f g h HYDROPOWER DEVELOPMENTS - LAÚCA HYDROPOWER DEVELOPMENT. (PDF 3.9 MB p. 2) www.coba.pt, accessed on August 5, 2016 (English).
  7. ↑ a b c d Laúca Hydropower Plant, Angola. Lahmeyer International , accessed on August 2, 2016 .
  8. ↑ a b c d e f g h i j Study of Environmental Impact of Laúca Dam Construction Project. (PDF 18.4 MB p. 51, 89–102, 233–235) (No longer available online.) Oesterreichische Kontrollbank , May 2013, archived from the original on August 8, 2016 ; accessed on August 8, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.oekb.at
  9. ↑ a b c d Lauca will be one of the biggest hydroelectric power plants in Africa. www.maxam.net, October 14, 2014, accessed on August 7, 2016 (English).
  10. ^ A b Andritz to supply equipment for Lauca hydropower project, Angola. www.waterpowermagazine.com, February 26, 2014, accessed August 7, 2016 .
  11. ↑ ANDRITZ HYDRO supplies electromechanical equipment for Lauca hydropower plant, Angola. (No longer available online.) Andritz AG , February 26, 2014, archived from the original on August 8, 2016 ; accessed on August 7, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.andritz.com
  12. ↑ a b Angolan government invests millions in energy. www.angola-today.com, November 16, 2015, accessed on August 7, 2016 .
  13. ↑ Odebrecht vai construir ligação à barragem de Lauca. www.redeangola.info, November 5, 2015, accessed August 7, 2016 (Portuguese).