# Miranda Dam

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**Miranda Dam** (Portuguese: *Barragem de Miranda*) is a [concrete](/source/Concrete) [buttress dam](/source/Buttress_dam) on the [Douro](/source/Douro), where the river forms the national border line between [Spain](/source/Spain) and [Portugal](/source/Portugal). It is located in the municipality [Miranda do Douro](/source/Miranda_do_Douro), in [Bragança District](/source/Bragan%C3%A7a_District), Portugal.

Construction of the dam began in 1955. The dam was completed in 1961. It is owned by *Companhia Portuguesa de Produção de Electricidade* (CPPE).[1]

## Dam

Miranda Dam is an 80-m-tall (height above foundation) and 263-m-long buttress dam with a crest altitude of 535 m. The volume of the dam is 240,000 m³. The dam contains 4 crest [spillways](/source/Spillway) (maximum discharge 11,000 m³/s) and one bottom outlet.[1]

## Reservoir

At full reservoir level of 528.05 m (maximum flood level of 533 m) the reservoir of the dam has a surface area of 1.22 km2 and its total capacity is 28.1 mio. m³ (active capacity 6.66 mio. m³).[1]

## Power plant

The power plant went operational in 1960. It is a [run-of-the-river](/source/Run-of-the-river_hydroelectricity) [hydroelectric](/source/Hydroelectricity) power station. It is owned by CPPE, but operated by [EDP](/source/Energias_de_Portugal).[2] The plant has a [nameplate capacity](/source/Nameplate_capacity) of 369[3][4] (390)[1][2] [MW](/source/Megawatt). Its average annual generation is 897.8[3] (879[4] or 1,036.3[1][2]) [GWh](/source/GWh).

### Miranda I

The power station contains 3 [Francis turbine](/source/Francis_turbine)-generators with 58.84 (67)[2] MW each in an [underground powerhouse](/source/Underground_powerhouse). The turbine rotation is 150 rpm. The minimum [hydraulic head](/source/Hydraulic_head) is 51 m, the maximum 66 m. Maximum flow per turbine is 128 m³/s.[3]

### Miranda II

In 1995 an additional underground powerhouse was completed and a further Francis turbine with a 193 MW capacity went online. The turbine rotation is 100 rpm. The minimum [hydraulic head](/source/Hydraulic_head) is 40 m, the maximum 60 m. Maximum flow of the turbine is 386 m³/s.[3]

## See also

- [List of power stations in Portugal](/source/List_of_power_stations_in_Portugal)

## References

1. ["MIRANDA DAM"](http://cnpgb.apambiente.pt/gr_barragens/gbingles/FichasIng/MirandafichaIng.htm). APA Barragens de Portugal. Retrieved 2015-02-05.

1. ["Miranda Hydroelectric Power Plant Portugal"](http://globalenergyobservatory.org/geoid/43537). Global Energy Observatory. Retrieved 2015-02-05.

1. ["Miranda Informação Técnica"](https://web.archive.org/web/20141103174852/http://www.a-nossa-energia.edp.pt/centros_produtores/info_tecnica.php?item_id=34&cp_type=he&section_type=info_tecnica) (in Portuguese). [Energias de Portugal](/source/Energias_de_Portugal). Archived from [the original](http://www.a-nossa-energia.edp.pt/centros_produtores/info_tecnica.php?item_id=34&cp_type=he&section_type=info_tecnica) on 2014-11-03. Retrieved 2015-02-05.

1. ["DECLARAÇÃO AMBIENTAL 2012"](https://web.archive.org/web/20141103172532/http://www.a-nossa-energia.edp.pt/pdf/desempenho_ambiental/da_2012.pdf) (in Portuguese). [Energias de Portugal](/source/Energias_de_Portugal). pp. 29–30 (27–28). Archived from [the original](http://www.a-nossa-energia.edp.pt/pdf/desempenho_ambiental/da_2012.pdf) on 2014-11-03. Retrieved 2015-02-05.

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Adapted from the Wikipedia article [Miranda Dam](https://en.wikipedia.org/wiki/Miranda_Dam) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Miranda_Dam?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.