Bjordalen is a power plant on the Skien watershed in Hjartdal Municipality in Telemark County.

Ownership: Statkraft is an indirect co-owner through its 66.62 per cent ownership in Skagerak Energi AS
Production: 9.4 GWh
Power: 2.9 MW

The power plant was commissioned in 1960 and uses a height of fall of 49 metres between Lake Skjesvatnet and Lake Breivatnet. It also draws water from the Heåi River.

The power plant has one Francis turbine with an installed capacity of 2.9 MW.

The diversion tunnel has a limited capacity, which leads to water flowing around the tunnel and being lost to production during periods of high water flow in the watercourse. The water from Lake Skjesvatnet is supplied to the power plant partly through pipes above ground. This means that water must be kept flowing during colder periods to prevent it from freezing. As a result, it is important to maintain production in the power plant throughout the entire winter.

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.