OSSA Email Format

Civil EngineeringCommunity of Madrid, Spain501-1000 Employees

OSSA is a civil engineering specialist focused on underground construction across mining, tunneling for road, rail, and subway systems, as well as underground hydraulic projects and hydro power plant tunnels. With more than seven decades of specialization and ongoing innovation, the company has earned an international reputation for delivering complex underground works in challenging soils, remote locations, and under tight budgets and schedules.
Based in San Sebastián de Los Reyes, in the Community of Madrid, OSSA is a mid-sized contractor with an international footprint in underground civil engineering. It serves mining groups such as coal, copper, iron and potash operators, and designs and builds vertical shafts, tunnels, large caverns, underground workshops, and pump stations for underground infrastructure. The company has completed seven major underground hydroelectric plants, including Cortes-La Muela in Valencia and San Esteban in Orense. Founded in 1952, OSSA has a long history of undertaking complex projects in difficult conditions.

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