Spain’s first underground hydrogen storage facility will be installed in Aljarafe, Seville, where Trinity is leading a project to boost green hydrogen infrastructure. Using depleted deposits in Benacazón, Bollullos de la Mitación and Aznalcázar, this region will become a pioneer in underground hydrogen storage in Spain.
Hydrogen storage underground ensures tons of green energy
Julio Matesanz, Trinity’s Director of Operations, explains that the feasibility studies carried out since 2018 confirm that these deposits, located at a depth of 900 metres and sealed by 800 metres of impermeable clay , offer ideal conditions for the safe storage of hydrogen.
The so-called Aljarafe Project has already passed its testing phase, and is currently advancing in the engineering necessary to connect the underground wells with the surface. Thanks to the existing geological structure, the project has a significant advantage over others in Spain, such as those in Cantabria and the Basque Country, which need to develop the infrastructure from scratch.
Another key aspect of this storage facility is its ability to connect to the main transport network promoted by Enagás , which will facilitate its integration into the national and European energy market. It is estimated that the capacity of the site will reach 150 million cubic meters, allowing the storage of some 14,000 tons of green hydrogen.
Green hydrogen as a strategic resource in Europe
Matesanz stresses that green hydrogen depends on renewable energy sources, such as solar and wind, whose production varies with the climate. Storage is therefore key to ensuring a stable supply in the new European hydrogen market, where Spain aims to become one of the main exporters. This type of initiative positions the country as an essential player in Europe’s energy transition, maximising the reliability of its renewable sources.
In addition, Trinity plans to integrate knowledge acquired in the European Euh2stars project , based in Austria, to consolidate the success of the Aljarafe Project and offer a scalable and secure hydrogen storage model. With the aim of starting operations in 2030, this underground storage facility ensures a strategic energy reserve for Spain and contributes to the development of a more sustainable and reliable energy network on the continent.
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Source and photo: Trinity Energy Storage via Diario de Sevilla
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