The Foz Tua Dam: High Quality DYWIDAG Products for increased Sustainability

The dam project on the Tua River in Portugal is one of the largest construction projects for renewable energy of EDP - Energias de Portugal S.A., one of the most important energy suppliers in Europe. The new pumped storage power station will considerably increase the percentage of hydroelectric power in Portugal’s energy mix while at the same time reducing the consumption of fossil fuels.

The Foz Tua Dam is located between the municipalities of Carrezada de Ansães and Alijó in northern Portugal. The double curvature arch dam measures 108m at its highest point and has a crest length of 275m. In addition to a bottom outlet and a device for releasing residual flows, a flood spillway and flood gates will be built into the dam.

On the right river bank, approx. 500m downstream from the dam, a shaft powerhouse is being built that includes an underground discharge chamber and two shafts as well as two reversible turbine units. The project also includes the construction of a 700m long underground hydraulic circuit consisting of two separate, lined tunnels with inner diameters of 5.5 to 7.5m. With an installed capacity of 252MW, the Foz Tua hydroelectric plant will produce an average of 667GWh/year once completed in 2016.

DSI produced and supplied a wide range of products for several slope stabilization and reinforcement efforts in this project:

  • 110 permanent DYWIDAG 7 Strand Anchors including anchor heads
  • 943m of R32-210 DYWI® Drill Hollow Bar Anchors
  • 240 1.5 to 3.0m long Type ERB120 OMEGA-BOLT Expandable Friction Bolts
  • 840m of 20mm Ø DYWIDAG THREADBAR
  • 6,179 3 to 24m long Double Corrosion Protected DYWIDAG Soil Nails consisting of 25/32 and 40 mm Ø GEWI® Steel

Various products and systems were customized by DSI in accordance with project specific requirements. DSI met all the technical requirements, and was able to supply the best solution in short response times thanks to the close cooperation with the designers and the contractors.


EDP – Gestão da Produção de Energia, S.A., Portugal

General Contractor

Joint Venture Barragem de Foz Tua ACE, consisting of Mota-Engil Engenharia e Construção S.A., Somague Engenharia S.A. and MSF Engenharia S.A., all of them Portugal


Mota-Engil Engenharia e Construção S.A., TECNASOL Fundações e Geotecnia S.A. and Barragem de Foz Tua ACE, all of them Portugal


EDP – Gestão da Produção de Energia, S.A., Portugal

DSI Unit

DYWIDAG Sistemas Constructivos S.A., Portugal

DSC Scope

Development, production, supply, technical support

DYWIDAG Products

110 permanent DYWIDAG Strand Anchors; 943m of R32-210 DYWI® Drill Hollow Bar Anchors; 240 OMEGA-BOLT® Expandable Friction Bolts; 840m of 20mm Ø DYWIDAG THREADBAR®; 6,179 DYWIDAG Soil Nails, 25/32 and 40mm Ø.

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