The intake in Leirelva is a typical gravity dam. The penstock is laid with ductile cast iron pipes, where the entire length, about 2,150 m, is buried, and 1000 metres of the pipe are laid in a trench together with the pipes for Tverråga. The penstock runs through a steep and landslide-prone area, which meant that special considerations had to be made during the construction process with respect to the scope of the intervention and weather conditions.
Fjellbygg AS was the contractor for the building and construction in Leirskardalen. The waterway equipment was supplied by Br.Dahl, while Spetals Verk AS supplied all the electromechanical equipment.