Documentary on different installations in the Pyrenees of the company Hidroeléctrica de Cataluña S.A.

Highlights of the Pyrenees: Hydroelectric power estation of  Seira (near Barbastro), and Esterri d'Àneu-Unarre (snowing), Espot weather station (central Sant Maurici salt), Negre and Tort Trullo lakes, Sau dam, reservoir in Pont de Suert, Esterri and the Collegats.