The Midskog national grid substation located 20 miles east of Östersund has reached its service life and is currently being upgraded to meet operational reliability requirements and to connect even more renewable power generation. The upgraded station will be located 1 mile south of its original location. The new upgraded area will be 7 ha in total or as large as 10 soccer fields and it is one of the largest investments in the Swedish national grid ever made.
“Midskog is one of the largest national grid substations in Sweden and the investment means that we get a new and modern hub for the national grid that holds for the future. It is also important to be able to connect new, and renewable wind power generation in the area to the national grid”, says Linda Granfelt, project manager at Swedish National Grid.
Renewable Power in Sweden
Renewable power generation, mainly from wind, is growing in The Power Region and the substation needs the upgrade to be able to receive more planned power generation, including Sweden’s largest onshore wind power project, Vasa Vind’s Åskälen-Österåsen of 300 MW.
Midskog is transforming between 400 kV and 220 kV, but there is a smaller 130 kV part run by Jämtkraft Elnät AB for the regional grid that serves Östersund.
A part of the Midskog overhaul is a modernization of the world’s oldest 400 kV power line (Storfinnforsen-Midskog) that comes to Midskog from the north. The power line was put into service in 1952. The change is not needed only because of its age, but increasing demand to connect renewable power generation to the grid.
Finished in 2019
Eitech Engineering AB holds the contract to build the new substation for Svenska kraftnät (“Swedish national grid”) and it is the largest power industry order for the Swedish company. The construction work has started and the new substation is expected to be operational in 2019.
The upgrade is one important part prior to the development of data center opportunities in The Power Region, as the Midskog mega data center site is located just outside the new substation and data centers will be connected to the Midskog substation.