Holsbruvatn and Rausdøla are located below the water intake reservoir for the new Tyin power station, which replaced the old plant in 2004. The new tunnels will allow Norsk Hydro to utilise previously unused water resources.

By resuming production at two of the generators in the old Tyin power station, Hydro will increase production by 84GWh, with the total power production from Tyin exceeding 1600GWh.

The company expects to invest slightly more than NOK 200M (US$31.7M) in the project.