Fingrid and Svenska Kraftnät have chosen Vattenfall Services Nordic Ab (www.vattenfall.com) to construct the 500-kV HVDC line between the Dannebo and Finnböle substations in Finland. The construction of the transmission line is part of the Fenno-Skan II submarine cable project between Finland and Sweden, scheduled for completion at the end of 2011.
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 DC transmission line of 70 km (43 miles) needs to be built in Sweden from Dannebo on the coast to Finnböle north of Stockholm. 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 II will improve the electricity transmission capacity between Finland and Sweden by about 40%, 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 also will reduce the risk of a serious disturbance and supply interruptions, and decrease transmission losses.