• IDOM

    El Hierro Hydrowind Power Plant

    CLIENT: Gorona del Viento El Hierro, S.A.

    SERVICES: Detail design, procurement management and technical assistance for the construction and commissioning.

    YEAR: 2008 - 2014

    COUNTRY: Spain

    Located on the island of El Hierro, the Detailed Designs, Procurement and Site Supervision have been developed in detail for the implementation of a wind farm consisting of five wind turbines and a pumped storage hydroelectric power station. With the project, a demand of up to 10 MW will be met by using renewable resources alone.

    The challenge of achieving energy selfsufficiency

    Adding renewable energies to the energy mix is essential to ensure the sustainability of electrical power systems. However, energy sources such as wind or photovoltaics are limited by the fluctuations in the power generated and not being able to satisfy demand. Energy storage methods, such as hydraulic reservoirs, can help mitigate these problems and improve the integration of these systems. Renewable energies are an important step towards a cleaner and more sustainable planet, reducing the emission of greenhouse gases as much as possible.

    The island of El Hierro has taken up the challenge of ensuring that the electric power supplied to the island comes mostly from renewable energy sources. To this end, a hydro-electric plant has been built and commissioned. This plant combines 11.5 MW of installed power from wind generators with a reversible hydroelectric plant. The hydroelectric power plant has an installed power of 11 MW of generation and 6 MW of pumping power. Considering that the demand peak of the island is 7.5 MW, this configuration means that, in certain conditions, demand on the island can be fully met with clean and inexhaustible energies.

    IDOM has participated in the project from the conception phase to its implementation, providing engineering services, procurement management and technical assistance for the construction and commissioning. The El Hierro Hydroelectric Plant began operations in July 2015 and its operation has been refined over time until, in February 2018, it reached the milestone of supplying the island’s consumption for 18 days in a row with 100 % renewable energies. It is expected that, in the coming years, the plant will supply over 65% of the total demand of the island. Increasing the renewable power generation (more wind, solar, etc.), the system could come close to 100%.


    Water Director

    Javier Fernández

    Infrastructure Managing Director

    Juan Ramón López Laborda

    Hydropower plants Director

    Faustino Guillén Minguito

    +34 91 444 11 50