The Seira hydroelectric plant comes into service Historical milestone · Seira, La Ribagorza, Huesca Image of Seira, not of the place itself. After six years of works in the bed of the Ésera, the Sociedad Catalana de Gas y Electricidad brought into service a power station with a Modernista air that brought industry and wages to a valley until then given over only to livestock. 6 de agosto de 1918 Photo: Vicenç Salvador Torres Guerola (CC BY-SA 4.0) What to see and do in Seira