Norway - Eidsfoss and Vrangfoss

On behalf of Norsjøkraft AS, Statkraft Energi AS awarded a contract to ANDRITZ HYDRO for rehabilitation of the control system at the Eidsfoss and Vrangfoss run-of-river power plants in March 2015.

The hydropower plants are owned by Norsjøkraft AS and operated by Statkraft Energi AS.

Both hydropower plants are located in southeastern Norway in Telemark County and are using the waters from the Skien water system. Built in the early 1960s, they still operate with the first relay-based control system.

The scope of ANDRITZ HYDRO’s supply comprises the replacement of the local control system, modifications of the turbine and generator systems, and installation of the cable connections. In addition, new measurement transformers, surge arrester and disconnector switches at medium and high voltage level are part of the delivery.

To keep the water level stable in all operation conditions, a level controller with additional emergency functionality has to be implemented in the control system. Furthermore, the intake gate will be equipped with new servomotors.

The commissioning of HPP Eidsfoss is scheduled for the end of 2015 and the works at Vrangfoss hydropower plant are scheduled for the end of 2016.

Technical data



Output:1 x 15 MW
Voltage:7.5 kV
Head:10 m
Speed:100 rpm



Output:2 x 17.5 MW
Voltage:10 kV
Head:23 m
Speed:200 rpm
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