The sea cable was laid at the bottom of Lake Näsijärvi – the 68-ton cable connects the substation to the grid

A new Syvälä substation will be built in Ruovede. The substation is an electricity network company Elenia project, and Sähkölandia Oy has completed the construction work. The station is scheduled to be completed at the end of 2026, the release states.

The goal of the power station is to strengthen the area’s electricity distribution. According to the company, the station improves the replaceability of other substations in the area in the event of disturbances, while also increasing the network’s capacity. Electricity quality also improves as network lengths shorten.

Four kilometers of cable to the bottom of the lake

In connection with the substation project, the company installed four kilometers of medium voltage cable at the bottom of Lake Näsijärvi in ​​Kuru.

Cabling is part of the trunk connection. It connects Ruovesi’s new substation and Kuru’s electricity grid.

Installing the cable in the waterway required precise planning and careful implementation.

The original schedule was delayed by a week due to bad wind conditions.

The installation of the cable was carried out by Elenia’s partner Brothers Hemming.

The cable is reinforced, i.e. armoured, as marine cables usually installed in the sea are.

The medium voltage cable was delivered in four large coils. Each of these four cable reels weighed about 17 tons, or about 13 kilograms per meter. Their combined weight is therefore 68 tons. The diameter of one coil is four meters.

“Installing the submarine cable at the bottom of Lake Näsijärvi was a technically interesting and demanding work phase. With the help of water cabling, we were able to implement the trunk connection along the most efficient possible route, which supports the development of the entire area’s electricity network well into the future,” says Elenia’s project manager Pasi Seppi.

A total of 76,900 km of electricity network

Elenia has electricity distribution networks Kanta- and Päijät-Hämee, Pirkanmaa, Central Finland and Southern and Northern Ostrobothnia in the area of ​​about one hundred municipalities.

The company has a total of 76,900 kilometers of electricity network.