Bemposta Dam

Bemposta Dam (Portuguese: Barragem de Bemposta) is a concrete arch dam on the Douro, where the river forms the national border line between Spain and Portugal. It is located in the municipality Mogadouro, in Bragança District, Portugal.

Bemposta Dam
Location of Bemposta Dam in Portugal
Official nameBarragem de Bemposta
Locationmunicipality Mogadouro, Bragança District, Portugal
Coordinates41°18′3.2″N 6°28′11.6″W
StatusOperational
Construction began1957
Opening date1964
Owner(s)Companhia Portuguesa de Produção de Electricidade
Dam and spillways
Type of damConcrete arch dam
ImpoundsDouro
Height87 m (285 ft)
Length297 m (974 ft)
Width (crest)3.5 m (11 ft)
Dam volume316,000 m3 (11,200,000 cu ft)
Spillway typeOver the dam
Spillway capacity11,500 m³
Reservoir
Total capacity129,000,000 m3 (105,000 acre⋅ft)
Active capacity20,000,000 m3 (16,000 acre⋅ft)
Surface area4.05 km2 (1.56 sq mi)
Power Station
Operator(s)Energias de Portugal
Commission dateBemposta I: 1964
Bemposta II: 2011
Hydraulic headBemposta I: 71 m (233 ft) (max)
Bemposta II: 65 m (213 ft) (static)
TurbinesBemposta I: 3 x 79.5 MW Francis-type
Bemposta II: 191 MW Francis-type
Installed capacityBemposta I: 240 MW
Bemposta II: 191 MW
Annual generationBemposta I: 924.1 GWh
Bemposta II: 134 GWh

Construction of the dam began in 1957. The dam was completed in 1964. It is owned by Companhia Portuguesa de Produção de Electricidade (CPPE).[1]

Dam

Bemposta Dam is an 87-metre-tall (285 ft) (height above foundation) and 297-metre-long (974 ft) arch dam with a crest altitude of 408 m. The volume of the dam is 316,000 m³. The dam contains four crest spillways (maximum discharge 11,500 m³/s) and one bottom outlet (maximum discharge 200 m³/s).[1]

Reservoir

At full reservoir level of 402 metres the reservoir of the dam (Portuguese: Albufeira da Barragem de Bemposta) has a surface area of 4.05 km² and its total capacity is 129 mio. m³ (active capacity 20 mio. m³).[1]

Power plant

The power plant is a run-of-the-river hydroelectric power station. It is owned by CPPE, but operated by EDP.[2]

Bemposta I

Bemposta I has a nameplate capacity of 240 (210)MW.[1][2][3] Its average annual generation is 924.1 (918,[4] 1,034[3] or 1,086[1]) GWh.[5]

The power station contains three Francis turbine-generators with 79.5 (70)[2] MW each in an underground powerhouse. The turbine rotation is 150 rpm. The minimum hydraulic head is 59 m, the maximum 71 m. Maximum flow per turbine is 152 m³/s.[5]

Bemposta II

In January 2008 construction began on the Bemposta II power plant. In December 2011 work on an additional underground powerhouse was completed and a further Francis turbine with a 191 MW capacity went online. Its average annual generation is 134 GWh.[6]

See also

References
  1. "BEMPOSTA DAM". APA Barragens de Portugal. Retrieved 2015-02-04.
  2. "Bemposta Hydroelectric Power Plant Portugal". Global Energy Observatory. Retrieved 2015-02-04.
  3. "Hidroelectricidade em Portugal memória e desafio" (PDF) (in Portuguese). Rede Eléctrica Nacional, S.A. (REN). p. 29 (27). Retrieved 2015-02-04.
  4. "DECLARAÇÃO AMBIENTAL 2012" (PDF) (in Portuguese). Energias de Portugal. p. 39 (37). Archived from the original (PDF) on 2014-11-03. Retrieved 2015-02-04.
  5. "Bemposta Informação Técnica" (in Portuguese). Energias de Portugal. Archived from the original on 2014-11-05. Retrieved 2015-02-04.
  6. "Bemposta II Informação Técnica" (in Portuguese). Energias de Portugal. Archived from the original on 2014-11-05. Retrieved 2015-02-04.
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