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8 October 2013
Opening of the La Muela II Hydroelectric Plant.
- OSSA had two contracts in 2007 worth about €18 million: "Exploratory Tunnel" and "Galleries for Access to the Plant".

- The Hydroelectric Plant La MuelaI was built by the JV OCISA/OSSA between 1983 and 1987. At that time, its Central Cavern was the largest in Europe.

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