Construcción / Construction


The projects of Civil Works carry a great responsibility given their complexity and social character. At OSSA we put our best resources at the service of the new challenges. For this reason, OSSA is the ideal partner, with proven technical capacity resulting from long experience.

Energía / Energy


OSSA has participated in the construction of more than seven underground hydroelectric plants, some of which have been for many years the most important in Europe (Hydroelectric Power Station of Cortes-La Muela in Valencia and San Esteban in Orense).

Minería / Mining


OSSA is a leader in coal mining, metal mining, ornamental stone mining projects and mining infrastructure works: Vertical shafts, access galleries and caverns, underground workshops, crushing plants and pumping rooms.

Servicios / Services


Thanks to our long history in the construction sector, OSSA has qualified personnel to manage lighting, electrical systems, safety systems, ventilation and other installations, as well as waterproofing. OSSA also provides technical assistance to the works.

Our Works

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Our Works

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Corporate Presentations

We put at your disposal our corporate presentation as well as our company policy and code of ethics in PDF format so that you can download and consult them whenever you wish.

OSSA, an International Company

Most of OSSA’s activity is carried out internationally, with more than 60 projects worth almost 2,000 million euros.