Fenno-Skan reduces the electrical distance between major generation and load areas in Finland and Sweden from 1500 km to 200 km.
The Fenno-Skan link is owned by
Fingrid and
Svenska Kraftnät (Swedish Power Grid). The 500 MW Fenno-Skan 1 link was commissioned in 1989 and the Fenno-Skan 2 link will add another 800 MW, thus strengthening the Nordic power grid, enhancing the capacity for power trading and improving the security of supply in the region. In parallel with the delivery of Fenno-Skan 2, the control system of the original Fenno-Skan link will be upgraded to the fully digital MACH2 system.
Fenno-Skan 1 was originally built as a monopolar link using sea return for the current, but will now become a bipole. The stations were built in such a way that a future addition of a second pole easily could be accomplished.
The 200 km long cable reaches the shore in Finland south of the town of Rauma, which is situated about 90 km north of Turku. A 33 km long overhead line connects the cable with the Rauma converter station.
Dannebo, the Swedish converter station for Fenno-Skan 1, is located near the Forsmark nuclear power station on the Swedish east coast, about 150 km north of Stockholm. The DC cable comes in to the converter station area, since the station lies only about 1 km from the coast.
For Fenno-Skan 2, due to AC grid constraints, the Swedish converter station is located further inland - in Finnböle - and a 70 km DC overhead line will connect the station to the submarine cable.
| Main data |  |
|---|
| Commissioning year: | Pole 1: 1989
Pole 2: 2011
Upgrade Fenno-Skan 1: 2013 |
| Power rating: | Pole 1: 500 MW
Pole 2: 800 MW |
| No. of poles: | 2 |
| AC voltage: | 400 kV (both ends) |
| DC voltage: | Pole 1: 400 kV
Pole 2: 500 kV |
| Length of DC submarine cables: | 200 km |
| Length of DC overhead line: | 33 km (Finnish side)
Pole 2: 70 km (Swedish side) |
| Main reason for choosing HVDC: | Length of sea crossing |
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