T&D World Magazine

Vattenfall Service Nordic Ab to Construct Submarine Cable between Finland and Sweden

Fingrid and Svenska Kraftnät have chosen Vattenfall Services Nordic Ab to construct the 500-kV high-voltage direct current line between the Dannebo and Finnböle substations in Finland. The construction of the transmission line is part of the Fenno-Skan 2 submarine cable project between Finland and Sweden, due to be ready at the end of 2011.

Fenno-Skan 2 will be an 800-MW and 500-kV electricity transmission connection between Finland and Sweden. The total length of the link will be approximately 300 km, of which the actual submarine cable will account for some 200 km.

The submarine cable will be connected to the Finnish transmission grid at the Rauma substation. In Sweden, the connection point to the Swedish grid is the Finnböle substation, which is not situated right on the coast. This is why a direct current transmission line of 70 km needs to be built in Sweden from Dannebo on the coast to Finnböle north of Stockholm. Vattenfall Services Nordic Ab has been chosen to construct this line. The price for the line in Sweden is approximately 23 million euros. The entire cable project will cost 300 million euros.

The submarine cable connection will be implemented jointly by transmission system operators Fingrid Oyj and Svenska Kraftnät in Finland and Sweden respectively. Fenno-Skan 2 will improve the electricity transmission capacity between Finland and Sweden by about 40 per cent, integrating the Nordic electricity market even more closely together. In practice, the cable link will reduce temporary price variations of electricity between the various countries in the electricity market. The cable will also reduce the risk of a serious disturbance and supply interruptions, and decrease transmission losses.

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