Fingrid expanding the Tammisto and Espoo substations

Fingrid Oyj, which is responsible for the main electricity transmission grid in Finland, will expand the 400 kilovolt (kV) substations in Vantaa (Tammisto) and in Espoo. The expansion work will be ready in the autumn of 2006.The Tammisto substation will be supplemented by installing a second main transformer, which will secure electricity supply in the Helsinki region. The expansion of the Espoo 400 kV substation will be carried out for connecting the Estlink direct current connection to the Finnish grid.

The project at Tammisto will cost approx. 7 million euros, covering the construction of a 400 kV gas-insulated indoor switch plant, adding a second main transformer, expansion of the 10 kV and 20 kV switch plants, and transmission line rearrangements in the substation area.

The value of the expansion project in Espoo is approx. 2 million euros, and, alongside the expansion of the 400 kV switch plant, it includes some renovation work.

The main contractor in the expansions is Fortum Service Oy. At Tammisto, the construction work is subcontracted by Skanska Tekra Oy and in Espoo by the Finnish Road Enterprise. The transmission line work is carried out by Eltel Networks Oy. The expansion of the 400 kV indoor switch plant and main transformer at Tammisto are supplied by ABB Oy.

The work at the substations will commence this autumn. The expansions will be commissioned in stages so that they will be in full operation in the autumn of 2006. During the construction period, there will be more frequent truck and machinery traffic than normally in the areas. Some quarrying work will also be carried out at Tammisto. Further information:   
Martti Heinonen, Project Manager (Tammisto), + 358 (0)30 395 5124 or + 358 (0)40 519 5080
Risto Ryynänen, Project Manager (Espoo), + 358 (0)30 395 5219 or + 358 (0)40 519 5093
Markku Hynönen, Substation Supervisor, + 358 (0)30 395 5350 or + 358 (0)400 477 835