(Photo: PeltonMan, Wikimedia Commons)

Grønvollfoss power plant is located in Notodden Municipality in Telemark County.

Ownership: Statkraft is an indirect co-owner through its 66.62 per cent ownership in Skagerak Energi AS
Production: 164 GWh
Power: 26.0 MW

The typical run-of-river power plant is located on the Tinnelva River about five kilometres below Årlifoss. It was begun during the depression in the early 1930s and was completed after a three-year construction period.

The height of fall is 22.6 metres.

The two original Kaplan generating units are still in operation after a rehabilitation in the mid-1980s and have an installed capacity of 26 MW. In 1997, the dam at the station was reinforced and the flood capacity expanded. In addition, a roadway was added to the dam.

Grønvollfoss utilises only 130 cubic metres of water per second compared with 160 cubic metres at the three other power plants in this part of the watercourse, making it a bottleneck.

A major transmission substation for power transmission lines from the north and west of Telemark County is located at the power plant.

Through its majority ownership in Skagerak Energi AS, Statkraft is co-owner of this power plant. Skagerak Kraft AS, a wholly owned subsidiary of Skagerak Energi, is responsible for daily operations, and manages the licences and obligations in terms of river management and regulating of the watercourse.