Tâmega Project

One of the most important initiatives in the energy sector in Portuguese history

  • LIEU
    Réseaux d'énergie - HT terrestre

The project

This flagship project of the Iberdrola group consists of building 3 new hydro-plants on the Tâmega River in the North of Portugal.

The infrastructure represents an investment of 1,5 billion Euro and should be completed in 2023.

The 3 new dams and hydroelectric plants, situated at Gouvâes, Daivoes and Alto Tâmega, will save 1.2 million tonnes of C02 emissions annually and will drastically diminish the imports of oil.


It is expected that the first plant (Gouvâes) will start operating in 2021. The construction is on schedule, and the assembly of the 4 generator sets is underway. These will produce a total of 880 MW and will be housed in an underground cavern.

Gouvâes will be a reversible plant, making it possible to store water from the Daivoes reservoir, taking advantage of the 650 metres of height difference. Energy can be used to pump water up when there is an excess of production and be recuperated when required. Its storage capacity will allow for continuous electricity supply for the Oporto metropolitan area for 24 hours.


Nexans is proud to be part of this ambitious project and to contribute to the development of renewable energy sources in Portugal.

For the Gouvâes hydro plant, Nexans in Spain has been assigned to do the engineering, design, manufacturing and installation of the power cables and accessories needed to connect the electricity plant to the national grid.

The cabling system consists of four circuits, each of them connected to a transformer which is connected to a 220MW turbine.

It is an iconic project because there is a huge 350 metres shaft in which we must lay the cable to reach the transformers gallery inside the mountain.

Installation works will start early 2020.


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