Ljósafoss plant was first of three stations that utilise power from the river Sog. The plant was designed by architect Sigurður Guðmundsson in Funkis style which is a unique Nordic flavor of Functionalism and features decorations by sculptor Ásmundur Sveinsson. The Ljósafoss plant hosts an interactive exhibition. The exhibition emphasises on play and experience where the nature and characteristics of electricity are shown in multiple forms and guests are led through the world of electricity in new and creative ways.
It is the oldest power station in the River Sog and is located near Ljósafoss by Lake Úlfljótsvatn’s outflow. The station is located on the river bank east of the waterfall, and the water runs through pipes to the station’s turbines and from there into the river below the waterfall.