Tjørhom power plant is located between the reservoirs Lake Gravatn and Lake Tjørhomvatn just south of the town of Tjørhom in Sirdal Municipality, Vest-Agder County.

Ownership: Statkraft is an indirect co-owner through its ownership in Skagerak Energi, Agder Energi and Sira-Kvina kraftselskap
Production: 518 GWh
Power: 120 MW

Tjørhom power plant was part of the third phase of construction in the Sira-Kvina development and was completed in 1973. The plant is situated in the Sira watercourse.

The power plant is located 300 metres inside a mountain and utilizes a height of fall of 158 metres. After the water from Lake Gravatn has produced power in the plant, it is transferred through a 500-metre-long tunnel to Lake Tjørhomvatn, then in a tunnel to Lake Ousdalsvatn and then through yet another tunnel 18 kilometres to the largest plant in the Sira-Kvina system, Tonstad power plant.

There are two generating units with Francis turbines installed, each producing 60 MW.

Through its ownership in Skagerak Energi AS, Agder Energi AS and Sira-Kvina kraftselskap, Statkraft is co-owner of this power plant. Sira-Kvina kraftselskap is responsible for daily operations, and manages the licences and obligations in terms of river management and regulating of the watercourse.