Fingrid to build a new transmission line to replace the old Iron Lady

The present 110 kilovolt (kV) transmission line between the Hikiä and Forssa substations is aged and in poor condition. The line was built in the 1920s, and its use can no longer be continued. The project will improve the system security of the Finnish power system and, above all, remove security risks. The old 110 kV line will be upgraded to 400 and 110 kV lines installed on double circuit towers, and the Forssa substation will be expanded in the same conjunction. The new transmission line will reduce losses in the grid by 30 to 50 GWh per year, which corresponds to the electricity consumption of approx. 2,000 single-family houses heated with electricity.

 

The 400 kV transmission line between the Hikiä and Forssa substations is part of the improvement of the transmission grid in Southern Finland. The electricity transmission needs in the west-east direction are increasing as a result of new wind turbines and nuclear power units being constructed and planned. The development of cross-border interconnections also adds to the transmission needs in the 400 kV network in Southern Finland.

 

The total length of the transmission line is approx. 78 kilometres. Most of the line will be located in the route of the old dismantled line. However, in Riihimäki the line will be located in a new route over a distance of approx. 9 kilometres for environmental reasons. In order to intensify the use of land, the towers are so-called double circuit towers. Moreover, the goal is to use the new field towers in arable land wherever possible. The project with a total value of more than 41 million euros will be completed by the end of 2015.

 

Further information:

Kari Kuusela, Executive Vice President, tel. +358 (0)30 395 5129
Aki Laurila, Engineering Manager, tel. +358 (0)30 395 5135