Dam Safety, Europe, News, Rehabilitation and Repair

Skanska to upgrade dams at Gråsjø and Trollheim hydroelectric plants in Norway

Skanska has signed a contract worth NOK508 million (US$55.5 million) with Statkraft Energi AS to refurbish and upgrade four dams and one flood gate in Norway.

The dams impound reservoirs for the 15-MW Gråsjø and 130-MW Trollheim hydroelectric power plants in Surnadal and Rindal municipalities. The dams at Gråsjø are reservoirs for the power plant with the same name, while the dam at Follsjø provides water for the Trollheim power plant.

Both power plants are owned and operated by Statkraft Energi AS. The dams need to be refurbished and upgraded to meet modern day standards. Gråsjø, on the Folla River, began operating in 1970 and the powerhouse contains a single Francis turbine-generator unit. Trollheim, on the Surna River, began operating in 1968 and the powerhouse contains a single Francis turbine-generator unit.

The construction work is expected to start in the first quarter of 2021 and be completed by Sept. 1, 2025.

In Norway alone, Stakraft operates 334 hydropower plants with an installed capacity of 15,722 MW, as well as four wind power plants with an installed capacity of 378 MW and 24 district heating plants. The company operates in 17 countries.