Operating since 1953
The Írafoss Station harnesses two of the waterfalls, Írafoss and Kistufoss, in the lower part of the River Sog. A dam has been built across the River Sog above Írafoss at virtually the same altitude as the Ljósafoss Station outflow.
The station went on-line in 1953 using two 15.5 MW generating units and was expanded with the addition of a 16.7 MW turbine in 1963.