Fratel Dam

Fratel Dam (Portuguese: Barragem de Fratel) is a concrete gravity dam on the Tagus, where the river forms the border line between the districts of Portalegre and Castelo Branco. It is located in the municipality Nisa, in Portalegre District, Portugal.

Fratel Dam
Location of Fratel Dam in Portugal
Official nameBarragem de Fratel
Locationmunicipality Nisa, Portalegre District, Portugal
Coordinates39°32′34.1″N 7°48′10.4″W
PurposePower
StatusOperational
Opening date1973
Owner(s)Companhia Portuguesa de Produção de Electricidade
Operator(s)Energias de Portugal
Dam and spillways
Type of damConcrete gravity dam
ImpoundsTagus
Height (foundation)48 m (157 ft)
Height (thalweg)43 m (141 ft)
Length240 m (790 ft)
Elevation at crest87 m (285 ft)
Dam volume124,000 m3 (4,400,000 cu ft)
Spillway typeDam body
Spillway capacity16,500 m3 (580,000 cu ft)
Reservoir
Total capacity92,500,000 m3 (75,000 acre⋅ft)
Active capacity21,000,000 m3 (17,000 acre⋅ft)
Surface area10 km2 (3.9 sq mi)
Normal elevation74 m (243 ft)
Operator(s)Energias de Portugal
Commission date1974
Hydraulic head28.8 m (94 ft) (max)
Turbines3 x 45.6 MW Kaplan-type
Installed capacity132 MW
Annual generation357.9 GWh

The dam was completed in 1973. It is owned by Companhia Portuguesa de Produção de Electricidade (CPPE).[1]

Dam

Fratel Dam is a 48 m tall (height above foundation) and 240 m long gravity dam with a crest altitude of 87 m. The volume of the dam is 124,000 m³. The spillway is part of the dam body (6 radial gates with a maximum discharge capacity of 16,500 m³/s).[1]

Reservoir

At full reservoir level of 74 m (maximum flood level of 76 m) the reservoir of the dam has a surface area of 10 (7,3)[2] km² and its total capacity is 92.5 mio. m³. The active capacity is 21 mio. m³. Minimum operating level is 71 m.[1]

Power plant

The run-of-the-river hydroelectric power plant went operational in 1974.[3] It is owned by CPPE, but operated by EDP.[4] The plant has a nameplate capacity of 132[2][4][3] (130)[1][5] MW. Its average annual generation is 357,9[3] (327,[2] 347.5[1][4] or 382[5]) GWh.

The power station contains 3 Kaplan turbine-generators with 45.6 MW (50 MVA) each in a dam powerhouse. The turbine rotation is 150 rpm. The minimum hydraulic head is 17.8 m, the maximum 28.8 m. Maximum flow per turbine is 250 m³/s.[3]

See also

References
  1. "FRATEL DAM". APA Barragens de Portugal. Retrieved 2015-02-21.
  2. "DECLARAÇÃO AMBIENTAL 2012" (PDF) (in Portuguese). Energias de Portugal. pp. 50 (48). Retrieved 2015-02-07.
  3. "Fratel Informação Técnica" (in Portuguese). Energias de Portugal. Retrieved 2015-02-21.
  4. "Fratel Hydroelectric Power Plant Portugal". Global Energy Observatory. Retrieved 2015-02-21.
  5. "Hidroelectricidade em Portugal memória e desafio" (PDF) (in Portuguese). Rede Eléctrica Nacional, S.A. p. 29 (27). Retrieved 2015-02-05.
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