Image of a bat

The study phases:

  • In 2013 and 2014, we studied bat populations living in the power stations and in infrastructures on the high river sections.
  • In 2015, we focussed on the mid sections of the basins in Noguera Pallaresa, Noguera Ribagorzana and Valle de Arán: we inspected the shelters, counted the populations and characterised individuals.
  • The same year, 918 bats were captured from 11 different species, of which four were considered vulnerable and one (66% of those captured) endangered (M. capaccinii), according to the Spanish Catalogue of Threatened Species. In addition, we realised that more than 60% of the tunnels studied had been inhabited at one point by bats.
  • In October, we discovered a significant chiroptera colony in one of the tunnels at the Camarasa power station (Lleida) with approximately 400 individuals of M. Capaccinii, and roughly 200 individuals of the Miniopterus shreibersii species, all considered vulnerable.
  • The Endesabats project continued in 2016, focussing on studying facilities located in low river sections and on monitoring the most significant colonies discovered in previous years. 


After more than three years of study and data compilation, at Endesa we have come up with some ideas to adapt our hydraulic facilities including changing the tunnel entrances, fitting specific refuge boxes and reducing light levels in certain critical points for the chiroptera.