The hydroelectric power stations and the transformation of the valleys Historical milestone · Llavorsí, Pallars Sobirà, Lleida Image of Llavorsí, not of the place itself. From the nineteen fifties onwards the construction of power stations, canals and reservoirs on the Noguera Pallaresa and its tributaries attracted gangs of workers, opened roads and changed the regime of the river and the landscape of the comarca. siglo XX Photo: Generalitat de Catalunya (Attribution) What to see and do in Llavorsí