The study has been started by Vattenfall, with AFRY investigating the technology areas of the existing units, civil work, electricity, and permits.
Juktan's power plant is located between the lakes Storjuktan and Storuman in the upper part of the Ume River, 20km north of Storuman municipality. The power plant was the first large pumped storage plant in Sweden and also the largest pumped storage power plant in operation from 1979 to 1996 with a storage capacity of ~ 30GWh. An unusual advantage of Juktan's reservoir design is that you can pump water from Storjuktan-to-Blaiksjön with a lower potential and generate with a higher potential from Blaiksjön-to-Storuman.
If Juktan is restored as a pumped storage power plant, it will be Sweden's largest project of its kind.
The feasibility study is ongoing until mid-2023 and when a decision is made on a return to pump operation, commissioning is expected to be in 2031.