Fennefoss power plant is built on an area that was previously characterized by mining and nickel production, where there were, among other things, large slag heaps. The area is now prepared as a publicly accessible hiking area. The Furuly bathing area and the riverbank along Odden Camping have also been upgraded as a result of the power plant construction.

Holen power station supplies Agder Energi with 677 GWh per year, making it our 3rd biggest power station